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AVOL Mfg. Co., Portland, Oregon
John C. Bellamy
Beta Enterprises
Bill-Mar Speciality Co., Ohio
Arthur Brown & Bro
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Bruning did not make their own slide rules but bought rebranded slide rules from Grafton Plastics, a privatee enterprise owned by Millie Ludwig and her husband, located in Grafton Illinos. Grafton Plastics rebranded the same slide rules for Post, Dietzgen, and Compass. Bruning would also contract toi get promotional advertising the the small slide rules for clients.
The company's history begins in lower Manhattan where Charles Bruning started the company in 1897 making blueprints. Only a year later, the company moved to Van Buren and Dearborn in Chicago. Fittingly, they moved around among in several locations in the Printer's Row area, finally settling at 445 Plymouth Court. Branches of the company were opened throughout the country. The company diversified into manufacturing drafting supplies and copy machinery for small to mid-size printing operations. Later, most of its profits would be made manufacturing the paper for these machines. The company is currently owned by Bosch.Bruning had offices in New York, New York; Newark, New Jersey; Boston, Massachusetts; Pittsburgh, Pennsylvania; Detroit, Michigan; Chicago, Illinois; Milwaukee, Wisconsin; St Louis, Missouri; Kansas City, Missouri; Houston, Texas; Los Angeles, California; San Francisco, California; Seattle, Washington; and Birmingham, Alabama. The Pickett catalog on the left shows that Picketts were distributed by Bruning in the 1950's. The entire catalog is available in the ISRM Library. |
 Charles Bruning Cat.No. 2398 Pocket Duplex ISRM 20.04.01.428 |
Charles Bruning Cat.No. 2398 Pocket Duplex Made in USA by Charles Bruning Front Scale: K, A [ B, ST, S ] D, T Back Scale: DF [ CF, CI, C ] D, L Gift of Philip Stanley of Worchester, Mass. Manual (4.35MB PDF) courtesy of Greg Scott's Slide Rules 
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 Charles Bruning 2401 ISRM 12.02.12.01 |
Charles Bruning 2401 Made in USA - Westinghouse Electric Promo Note Frederick Post 1444P wide metal framed cursor variation Front Scale: 12.5cm // A [ B, CI, C ] D, K \\ 5in Back Scale: [S, L, T ] Back Blank  Note: Body same as Post 1444-P |
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 Charles Bruning 2401 Early Cursor ISRM 14.07.02.86 |
Charles Bruning 2401 Early Cursor Made in USA Front Scale: 12.5cm // A [ B, CI, C ] D, K \\ 5in Back Scale: [S, L, T ] Back Adv/sleeve: Blank |
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 Charles Bruning 2401 - Borg-Warner Promo ISRM 22.05.06.36 (Replaced 13.07.03.06) 
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Charles Bruning 2401 - Borg-Warner Promo Made in USA Note Narrow metal framed cusor design Front Scale: 12.5cm // A [ B, CI, C ] D, K \\ 5in Back Scale: [S, L, T ] Back Advertising(and on sleeve): Borg-Warner Corporation, Marvel-Schebler Carburetor Div. Gift Of Nancy Ulrich Ted Ulrich Collection  Insert
 Instructions (3.7MB pdf) Copyright 1944Notice this advertisment for a magnifying lens by Bruning. |
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Charles Bruning 2401 (New plastic Cursor) ISRM 22.07.06.148 |
Charles Bruning 2401 - Molded one-piece cursor lens Made in USA by Charles Bruning Co. Front Scale: 12.5cm // A [ B, CI, C ] D, K \\ 5in Back Scale: [S, L, T ] Back: Blank Gift Of Cindy Tate, Bozeman, Montana. Victor B. tate Collection. |
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 Charles Bruning 2401 Texas Instruments ISRM 14.07.02.07 |
Charles Bruning 2401 (Newer Cursor) Texas Instruments Made in USA - Advertising use - Body same as Post 1444P Front Scale: 12.5cm // A [ B, CI, C ] D, K \\ 5in Back Scale: [S, L, T ] Back Adv: Texas Instruments, Semiconductor Components Division. Gift Of Ed Millis, Dallas, Texas. Ed worked at TI in this division which developed the electronic calculator. |
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 Charles Bruning 68-540 (old 2401) ISRM 12.03.16.03 |
Charles Bruning 68-540 (old 2401) Made in USA - Note updated cursor design Front Scale: 12.5cm // A [ B, CI, C ] D, K \\ 5in Back Scale: [S, L, T ] Back Adv:Power Specialty Company, Houston, Texas  Retail BoxInstructions (3.7MB pdf) Copyright 1944
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 Charles Bruning No. 2406 REF |
Charles Bruning 2406 - Simplex Made in Germany and rebranded for Charles Bruning Co. Front Scale: 4in // A [ B, C ] D Back Scale: [S, L, T ] Back: Model number. Archive - Ebay listing photo |
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 Charles Bruning 2420 10" Polyphase Mannheim ISRM 13.08.27.02 |
Charles Bruning 2420 10" Polyphase Mannheim Made in USA Front Scale: 10inch // A [ B, CI, C ] D, K \\ 25cm Back Scale: [S, L, T ] Back: Conversion Table Gift of Arthur Anderson, Boulder, Colorado Art used his first slide rule, a K&E 4081-3, which is in the ISRM K&E gallery, as a freshman at Rensselaer Polytechnic Institute in Troy, New York in 1952. RPI is the United State's oldest technological university.
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 Charles Bruning 2460 Student Slide Rule ISRM 11.08.28.01 |
Charles Bruning 2460 Student Slide Rule Made in USA - circa 1945 Front Scale: A [ B, CI, C ] D, K Back Scale: [S, L, T ] Back: Conversion Table Original Owners: Wesley Greavu - class #149, Ziegenbalg - Class #164 
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 Bruning 2472 (Gilson Midget) ISRM 17.06.14.03 |
Bruning 2472 (Gilson Midget)- 10.2cm dia Made in USA for Bruning by Gilson Slide Rule Co., Stuart, Florida Note: Copyright 1931 & 1936 Front Scales: C, CI, A, K, Log, LL1, LL2, LL3, LL4, Back Scales: Binary, Fraction, Drill, Thread, Millimeter Gift Of Bruce HildenBrand 
 8MB PDF
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 Bruning 68-471 (Gilson Binary) 21.1cm dia ISRM 17.06.14.01 |
Bruning 68-471 (Gilson Binary) 21.1cm dia. Made in USA by Gilson for Bruning. Copyrighted 1940. Front Scales C, CI, A, K, Log, LL1, LL2, LL3, LL4, Binary, Fraction, Drill, Thread, Millimeter Back Scales Degrees, S, T, Degrees, S, T, Degrees, S, T, Fractions Gift Of Bruce Hildenbrand 
Manual 8Mb |
 Full 1912 Catalog M Smithsonian American History Museum. Note Four slide rule models are described in this catalog. | Central Scientific Company was founded in 1900 in downtown Chicago. It was created from of what was left of the Olmstad Scientific Company. Central Scientific manufactured and distributed science teaching equipment for schools, colleges, and universities by catalog mail order. The trademark CENCO was used from 1909 onwards. CENCO dominated the field of selling science education equipment through their mail order catalog. By 1935, the company established itself as one of the leading national suppliers of science equipment. During World War II, part of the manufacturing facility was turned over to the production of war necessities, making bombsights for airplanes and fuses for large bombs. After 1968, the company began having financial difficulties. In 1974, the assets were sold off to competitors. The educational business retained the name Central Scientific Company. In April 1979, Central Scientific's assets and activities were acquired by two businessmen from Buffalo, New York. They sold the business to Sargent-Welch (their main competitor) in 2000. |
 CENCO No. 73256 Plastic Slide Rule c1940 ISRM 22.05.37 
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CENCO No. 73256 (Parisian Novelty Co.) Plastic Slide Rule c1940 Made in USA by Parisian Novelty Co., Chicago, Illinois for Central Scientific Co. Catalog Patent US02,073,421 Inventor: Joseph Komorous Riverside, Ill. Material: Folded Thin plastic film. Front Scale: A [ B, CI, C ] D Back Scale: T, L, S Front slide: 6in, 15.3cm Back of slide Decimal Equivalents Well: Equivalents (US Bureau of Standards No. 47) Note: around 1970 this was purchased new by Ted Ulrich from the National Bureau of Standards in Washington, DC Gift Of Nancy Ulrich for Ted Ulrich Collection |
 Central Scientific Co. Gas Volume Reduction Chart 1921 REF |
Central Scientific Co. Gas Volume Reduction Chart 1921 Made in USA by Central Scientific Co., 412 to 420 Orlens Street, Chicago
Front Scale: 1-79mm, Volume Factor (in window) ( 1-10-100, 10$deg;C to 35°C |
 Climatemaker Slide Rule Service 10-B 21.02.10.01 |
Climatemaker Slide Rule Service 10-B Made in USA by Lawrence for Climatemaker, Bloomington, Illinois. White painted wood body with Blue text. Magnifying Cursor. Front Scale: A [ B, CI, C ] D, K Back Slider [ S, L, T ] Back: Conversion Chart |
 Climatemaker Heat Loss Calculating Rule REF S553
Instructions 10.9MB
Worksheet 5.4MB
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Climatemaker Heat Loss Calculating Rule - 1938 Made in USA by Climatemaker Corp., 1804 WestEnd Ave, Nashville, Tennessee
Front Scale:
Forced Air |stack size, Pipe Size, Pipe Area, CFM, BTU| |
C-Thru Ruler Company
 C-Thru No. 27 Pocket (Version 1) ISRM 21.06.10.34 |
C-Thru No. 27 Pocket (Version 1 - Trig scales on back of slide) Made in USA - C-Thru Ruler, Hartford, Connecticut Note: Folded Sheet Plastic Slide Rule Front Scale : A [ 5in, B, CI, C, 12.5cm ] D Back Scale : S, L, T Well: Units Equivalants Back Slide: Decimal Equivalents Gift of Bob Dehn Collection 
 Instructions 670Kb | ||
 C-Thru No. 27 Pocket (Version 2) ISRM 12.02.19.01 |
C-Thru No. 27 Pocket (Version 2 - Trig scales on back of stock) Made in USA - C-Thru Ruler, Bloomfield, Connecticut Note: Folded Sheet Plastic Slide Rule Front Scale : A [ 5in, B, CI, C, 12.5cm ] D Back Scale : S, L, T Well: Units Equivalants Back Slide: Decimal Equivalents Original owner: Bruce Day of Kansas City, Missouri Donated by wife, Nancy Day of Kansas City, Missouri William Bruce Day was given his first slide rule when he was in high school while his father, William M. Day, was stationed at Vandenburg AFB. Bruce later became a career military officer who flew B-52 missions in Vietnam and later C130s as a member of the reserves, retiring as a Lt. Col. Bruce obtained this slide rule after retiring from the Military. His civilian life was spent as a Patent and Trademark Attorny in Kansas City, where he still resides. His K&E 68-1617 slide rule is shown in the K&E Standard gallery. | ||
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Agitair No. 27 Pocket (rebranded C-Thru Version 2) Made in USA - C-Thru Ruler, Hartford, Connecticut Front Scale : A [ 5in, B, CI, C, 12.5cm ] D Back Scale : S, L, T Well: Units Equivalants Back Slide: Decimal Equivalents Donated by Daniel Swerdlow, Bethesda, Maryland 
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 C-Thru No.88 ISRM 20.08.15.08 |
C-Thru No.88 (Sheet Plastic Slide Rule) Made in USA - C-Thru Ruler, Bloomfield, Connecticut Front Scale : A [ 10in, B, CI, C, 25cm ] D, K Back Scale : S, L, T Well: Units Equivalants Back Slide: Decimal Equivalents Sleeve Markings Science Department - BHS (Boulder High School). Gifted by Robert Carlisle of Nederland, Colorado 
Instructions 670Kb | ||
 C-Thru S-888 Basic Duplex ISRM 17.08.24.03 |
C-Thru S-888 Basic Duplex Made in Japan for C-Thru Ruler, Hartford, Connecticut Front Scale: S, K, A [ B, CI, C ] D, L, T Back: Blank Clear plastic sleeve Gift Of Nancy Morris for the husband Dustin E. Morris Collection_ 
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 REF C-Thru S-889 |
C-Thru S-889 Made in Japan for C-Thru Ruler, Hartford, Connecticut Front Scale: LL01, K, A [ B, T, ST, S ] D, L, LL1 Back Scale: LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 Archive - Rod Lovett Collection | ||
 S370 C-Thru S-890 |
C-Thru S-890 Made in Japan for C-Thru Ruler, Hartford, Connecticut Front Scale: LL01, K, A [ B, T, ST, S ] D, LL3, LL2 Back Scale: LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 | ||
 C-Thru S-94 Slide Rule 4-1/2in dia ISRM 14.07.02.05 |
C-Thru S-94 Slide Rule 4-1/2in dia Made in USA - C-Thru Ruler Company, Hartford, Conn. Front Scale: K, D, ( C, B, A, CI, L) Back Scale: S, L, T Back: Instructions Gift of Ed Millis, Dallas, Texas | ||
 C-Thru S-96 Slide Rule 6in dia ISRM 21.08.07.32 |
C-Thru S-96 Slide Rule 6in dia Made in USA - C-Thru Ruler Company, Hartford, Conn. Front Scale: K, D, ( C, B, A, CI, L) Back Scale: S, L, T Back: Instructions Gift Of William Lisowski 
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 C-Thru S-96 Slide Rule 6in dia ISRM 04.09.27.01.D1 |
C-Thru S-96 Slide Rule 6in dia Made in USA - C-Thru Ruler Company, Hartford, Conn. Front Scale: K, D, ( C, B, A, CI, L) Back Scale: S, L, T Back: Instructions Note:Modified cursor (See original above). | ||
 C-Thru PS-69 Proportional Scale 5in dia ISRM 14.07.22.09 |
C-Thru PS-69 Proportional Scale 5in dia Made in USA - C-Thru Ruler Company, Hartford, Conn. Front Scale: Reproduction Size ( Size of Original, L) Percentage of Original Size, Number of Times of Reduction. Back: Blank Gift of Phillip Rodley, Upper Hutt, New Zealand. |
 Davis Instruments T-S-D Computer ISRM 14.07.02.96 |
Davis Instruments T-S-D Computer Made in USA by Davis Instruments Corp., Hayward, CA. 6in Diameter Palstic Front Scale (C&D scale): DISTANCE: Nautical or Statute Miles, KM or Yards (TIME: Minutes, Hours) SPEED Back: Instructions Gift Of Ed G. Millis, Dallas, Texas. 
Ed Millis was at TI while the electronic 'slide rule' calculator was developed and is good friends with Jerry Merryman, the designer of the first calculator in 1967. Ed has also written a book on hobbies Hither, Thither and Yawn. Ed is a generous donor of over a hundred slide rules, calculators and ephemera to ISRM.
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Dieterich-Post Co. (DIEPO)|
Formed in 1917 by James W. Dieterich (abt 1889 - died?) and Rudolph Post. Historical background notes: In 1911, James W. Dieterich, had worked his way up to blueprint foreman at B.L. Makepeace Co., then went west to land a job as a salesman with the K&E branch in San Francisco. Jacob and Charles Bruning, in Chicago, bought out W. B. Huey's interest in American Blueprint Co. in 1914. After the America Blueprint Co. buyout, W.B. Huey and A.W. Huey acquire the coating rights to Bruning products and start the Huey Company in 1915. By 1917, Rudolph Post, nephew of Charles Bruning, recruited Jim Dieterich from K&E and obtained financing for a blueprint operation from his uncle. Later in the year, the two buy out Bruning's interest and form Dieterich-Post Company. Slide rules were a monor part of the office supply business and DIEPO OEM'd from other companies like Pickett & Eckel, Inc in Chicago, Charles Bruning in California and Albert Nestler in Germany. On Wednesday, October 22, 1947, a U.S. federal trademark registration was filed for DIEPO by Dieterich-Post Company, San Francisco. The USPTO has given the DIEPO trademark serial number of 71538617. The federal status of this trademark filing expired 11/3/1992. The Dieterich-Post Company was still operating in Monterey Park, California in 2010. The Dieterich-Post website, at the time, stated that 2010 is its 93rd year of doing business. DIEPO continued a relationship with Charles Bruning Co. (C.B.Co.) evidenced by a 1950's rebranded slide rule made by C.B.Co. By 2011 Dieterich-Post Co. was acquired by American Reprographics Co and all historical information about Dieterich-Post had been deleted from its website.
ISRM used the Wayback Machine to find historical background from the image of the 1998 www.dieterich-post.com website |
 Dieterich-Post Mannheim (Alfred Nestler 2012) ISRM 13.10.07.09 |
Dieterich-Post Mannheim (Alfred Nestler 2012) Made in Germany by Alfred Nestler for Dieterich-Post Co. Los Angeles - San Fransisco - Oakland Note: Rebranding inside well. Front Scale: A [ B, C ] D Back scale: [ S, L, T ] Note: Thin film plastic cursor. See the Nestler 2012 which has a metal framed cursor. |
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 Pickett & Eckel 1010 Duplex c1948 ISRM 14.01.10.42  Box with Dieterich-Post Co. distributor label. |
Pickett 1010 Duplex sn2C40913 Serial Number 2C40913 stamped on cursor block. Made in USA by Pickett & A.F. Eckel, Inc. for Dieterich-Post Co. (no rebranding) Front Scale (Artwork #74) K, A [ B, ST, T Cot, S Cos, C ] D, DI Back Scale (Artwork #271) DF [ CF, CIF, CI, C ] D, L Note features: Metal Bar Cursor, Rounded Braces, Triangle Logo Gift of Bill Wehrend collection, Palo Alto, California. 
 Model 1000 Slide Rule Manual with CI and DI scale supplement. (5.80MB PDF) |
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 Dieterich-Post 3060P REF |
Dieterich-Post 3060P Made in USA for Dieterich-Post - This looks like a Charles Bruning Model Front Scale: 10in // A [ B, CI, C ] D, K \\ 25cm Back scale: TBD 
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 REF Dieterich-Post 3072 |
Dieterich-Post 3072 Made in USA for Dieterich-Post Front Scale: K, DF [ CF, CIF, CI, C ] D, L Back scale: TBD LL0, A [ B, S, T, C ] LL3, LL2, LL1 Archive - Found on eBay |
 Digi-Craft Digital Thermometer Metric Converter Deskset ISRM 13.00.00.54 |
Digi-Craft Digital Thermometer Metric Converter Deskset Made in USA. Front Scale: 12in, °F, °C, C [ Length, Area, Weight, Volume Conversion ] D, 30cm Back Promo: XI SSO (or OSS IX) Ambient Temperature glows through the plastic. No batteries. This must have been a promotional item. 
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Disney Disney Mickey Mouse Slide Rule S269 |
Though not logarithmic based, these Disney slide rules may have kick started many engineering and scientific careers. Disney Mickey Mouse Slide Rule |
 Disney Mickey Mouse Disneyland S350 |
Disney Mickey Mouse Disneyland Made in Hong Kong for Walt Disney Co. Front Scale: Addition and Subtraction, Fahrenheit to Celsius Conversion Back scale: Multiplication and Division, Inch to Centimeter conversion Misc. Conversion Table |
 Disney Mickey Math Slide Rule S269 |
Disney Mickey Math Slide Rule Made in USA for Walt Disney Co. Front Scale: Addition and Subtraction, Fahrenheit to Celsius Conversion Back scale: Multiplication and Division, Inch to Centimeter conversion Misc. Conversion Table |
 Snoopy Slide Rule S534 |
Snoopy Slide Rule Made in USA for United Feature Syndicate. Front Scale: Addition and Subtraction, Fahrenheit to Celsius Conversion Back scale: Multiplication and Division, Inch to Centimeter conversion Misc. Conversion Table |
Easterly (John I.) Mfg. REF Easterly Rafter Calculator |
Easterly Rafter Calculator Made in USA - Designed and built by John I, Easterly, Healdsburg, CA 1940 Front Scale: [Scale A Length ] Common Rafter, Hip-Valley, Scale B Instructions Archive - Clay Castleberry Collection |
 REF Easterly Rafter Calculator |
Easterly Rafter Calculator Made in USA - Designed and built by John I, Easterly, Healdsburg, CA c1941-1954 Front Scale: [Scale A Length ] Common Rafter, Hip-Valley, Scale B Instructions Archive - Clay Castleberry Collection |
 REF Easterly Rafter Framer - Pickett 1082 |
Easterly Rafter Framer - Pickett 1082 Made in USA by Pickett - Designed by John I, Easterly, Watsonville, CA c1957 Front Scale: CR (Common Rafter) Hip-Valley Scale [ G ] H Back Scale: CR (Common Rafter) Hip-Valley Scale [ E ] F Archive - Clay Castleberry Collection |
 Empire Pedigree Precision ISRM 13.00.00.53 |
Empire Pedigree Precision Made in USA - Empire Pencil Co., Shelbyville, NY Note: Same stock and cursor as Sterling 587 Front Scale: A [ B, CI, C ] D, K Back Scale: [S, L, T ]
Instruction Sheet 1.35Mb |
 Empire Pedigree Pocket ISRM 20.04.01.082 |
Empire Pedigree Pocket Made in USA - Empire Pencil Co., Shelbyville, NY Note: Same stock and cursor as Sterling 587 Note: Red scales in this instance are not for denoting inverted scales. Front Scale: A [ B, CI, C ] D, K Back Scale: [S, L, T ] Gift of Philip Stanley Collection |
 Empire Pedigree Compact Pocket ISRM 21.06.10.15 |
Empire Pedigree Pocket Made in USA - Empire Pencil Co., Shelbyville, NY Note: Same stock and cursor as Sterling 587 Note: Red scales in this instance are not for denoting inverted scales. Front Scale: A [ B, CI, C ] D, K Back Scale: [S, L, T ] Gift Bob Dehn Collection |
 S157 Empire Pedigree 240 |
Empire Pedigree 240 (retail package) Made in USA - Empire Pencil Co., Shelbyville, NY - retail package Front Scale: A [ B, CI, C ] D, K Back Scale: [S, L, T ] Note: Red scales in this instance for cost reduction, not necessarily for denoting inverted scales. |
 REF Educational Instruments Corona 1 |
Educational Instruments Corona 1 - c1965 Made in USA by Educational Instruments, Inc - 9cm Diam plastic Note: Need help with company information Front Scale: C, D, R (= DI), A, K, L, S, T, ST Back: The back, which has a window to the front disk for more surface area for equations, contains a mine of information. 112 formulae; 2 trig tables, 41 conversion factors 6 series expansions, 2 numerical integration formulae 13 numerical constants, 72 integrals, 36 differentials Archive - Scan provided by Rod Lovette (UK) Collection |
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ESCO - Engineering Sales Co., Engineering Mfg. Co., Mayline Co.Founded in 1939 by H.L.DeLisle as ESCO - Engineering Sales Company, reselling OEM products, then became Engineering Manufacturing Co. in 1946 where it was purchased by E.H.May and incorporated, and started making products such as steel drafting tables as a Mayline brand. It was renamed Mayline Co. in 1953 and continues to this day. |
 Engineering Mfg Co ESCO 6002 ISRM 20.04.01.355 |
Engineering Mfg Co ESCO 6002 - c1946 Made in USA for Engineering Sales by Acu-Design. ESCO Logo on slide. Note: Red lettering faded - Brand can be seen in bright light Front Scale (Scale similar to Post 1457, Charvoz-Roos 109) T Cot, DF [ B, K, L, C ] D, S Cos, ST Back Scale: Fraction-Decimal [ CF, CIF, CI, C ] Trig identities Gift of Philip Stanley Collection |
 REF Engineering Sales Co., No. 6004 REF |
Engineering Sales Co., No. 6004 - c1940 Made in USA for Engineering Sales by Acu-Design Note: Red lettering faded - Brand can be seen in bright light Front Scale (Scale similar to Post 1457, Charvoz-Roos 109) T Cot, DF [ B, K, L, C ] D, S Cos, ST Back Scale: Fraction-Decimal [ CF, CIF, CI, C ] Trig identities Archive - Belongs to Jaan Raamot, Retired EE (Avia in Colorado) |
 REF Favor-Ruhl A-400 |
Favor-Ruhl A-400 Made in USA by Charvos-Roos (or Acu-Rule) - c1945 Front Scale: LL0, LL00, A [ B, K, CI, C ] S Cos, ST, T Cot, Back Scale: L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2 Cassou Oliver Collection - Found this in Illinois |
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"No sign posts on the mountains... no concrete highways in the soup... no rocky peak so kind it steps aside to let a plane go by. Yet, with the navigational instruments precision made by Felsenthal, in Felsenthal Plastics, Army Airmen fly the toughest country in the world." G. Felsenthal & Sons ad in Flying Magazine, January 1944 Made in Chicago Museum Fesenthal History. Felsenthal started as a novelty comkpant but ended up making the bulk of plastic Aviation slide rules for the US Government during WWII. Click on the Dalton Dead Reckoning Computer to go to the Aerospace Gallery, where there are five specimens shown. |
 Felsenthal 450A Generic Slide Rule ISRM 20.04.01.227 |
Felsenthal 450A Generic Slide Rule Made in USA by G. Felsenthal and sons, Chicago - c1960 Front Scale: A [ B, CI, C ] D Back Scale: S, L, T Back of slide: Decimal Equivalents Well: Equivalents Gift of Philip Stanley Collection 
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 Felsenthal FF-6 Logarithmic Calculator REF |
Felsenthal FF-6 Logarithmic Calculator (1951) Made in USA by G. Felsenthal and sons,Inc., Chicago - copyright 1951 Front Scale: T, D ( C, CI, L, Decimal to Fractions) Back Scale: S, A (B, K, DA, 0°-90°, 90°-0° Archive - Scan By Mike Syphers. 
28 page Instructions (3.3MB PDF)
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 REF Foxboro Flow And Valve Rule c1965 |
Foxboro Flow And Valve Rule Made in Japan by Hemmi. Front Scale: Back Scale: Archive - Courtesy of Jerry Kostro, wwww.NatGasEdu.com |
 Foxboro Flow And Valve Rule c1970 ISRM 11.11.11.01 |
Foxboro Flow And Valve Rule Made in Japan by Hemmi. No cursor on this version. Front Scale: Back Scale: Donated By Carlee Heit, Houston Texas, in Memory of her husband Ray Heit |
 Foxboro Flow And Valve Rule Stainless Steel (1939) ISRM 22.11.16.01 |
Foxboro Flow And Valve Rule Made in USA . Front Scale: Sizes [ Valve sizes, Drop Pounds, gas, Cu. Feet/day Flow ] Steam Lbs per hour. Back Scale: Tables Sizing control valves usually involved solving for the valve's Cv based on flow rate, flowing temperature, specific gravity, and upstream and downstream pressures. The most common orifice meter calculation involved solving for the "beta ratio" or "beta" (the ratio between the diameter of the orifice and the inside diameter of the meter run pipe, or "d/D") given the maximum flow, flowing temperature, specific gravity of the gas, static pressure and line size of the run. Given the small size of the slide rules, these devices were intended to be more portable than precise. If more accurate answers were required, the user was referred to the companion book "Principles and Practice of Flow Meter Engineering" by L. K. Spink. Donated By Joel Hirsfield |
 Foxboro Flow And Valve Rule (c1975) ISRM 11.11.11.05 |
Foxboro Flow And Valve Rule Made in USA - This is constructed much like a slide chart, but with a cursor like a slide rule. Front Scale: Back Scale: Sizing control valves usually involved solving for the valve's Cv based on flow rate, flowing temperature, specific gravity, and upstream and downstream pressures. The most common orifice meter calculation involved solving for the "beta ratio" or "beta" (the ratio between the diameter of the orifice and the inside diameter of the meter run pipe, or "d/D") given the maximum flow, flowing temperature, specific gravity of the gas, static pressure and line size of the run. Given the small size of the slide rules, these devices were intended to be more portable than precise. If more accurate answers were required, the user was referred to the companion book "Principles and Practice of Flow Meter Engineering" by L. K. Spink. The slide rule above shows sides for both English (red or maroon) and Metric (blue) units. Donated By Carlee Heit, Houston Texas, in Memory of her husband Ray Heit |
Fullerton Engineering Sales Co. - A distributor of rebranded Acu-math and Concise slide rules located at 4623 York Blvd. Los Angeles 41, California, phone: Clinton 6-2286. the telephone number dates the company in the 1960's. The instruction manual for a Fullerton No.1450, A re-branded Concise 28N circular slide rule, showed an address for Fullerton Sales Company, 811 Milford Street, Glendale 3, California. Telephone 245-7261. That same manual, on page 4, lists 8 model numbers of circular slide rules with varying scale sets.
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Fullerton 320 Acudial Image Needed |
Fullerton 320 Acudial For small business use. Made in Japan by Concise - 9.6cm Dia Front Scale: D ( C, CI, A, K ) Back: Conversion table and calendar |
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 Fullerton-Acu 400 ISRM |
Fullerton-Acu 400 - Simplex Trig - c1968 Made in USA - Wrap Over Cursor Front Scale: S, K, A [ B, CI, C ] D, L, T Back Blank Original owner: (Markings on slide rule) Paul Cohen |
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 Fullerton-Acu 400 ISRM |
Fullerton-Acu 400 - Simplex Trig - c1968 Made in USA - Wrap Over Cursor Front Scale: S, K, A [ B, CI, C ] D, L, T Back Blank Original owner: (Markings on slide rule) Frank Merhar Donated by the Huang Collection. |
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  Fullerton-Acu 600 Basic Trig ISRM 12.06.24.31 |
Fullerton-Acumath 600 Basic Trig - 1959 note: double end plates- duplex cursor - flat edge plastic stock Made in USA by Acumath for Fullerton - Oval Acumath Logo Front Scale: S, S&T, K, A [ B, CI, C ] D, L, T Back Scale: Conversion Table [Fraction=Decimal] Trig properties
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Fullerton-Acu 1240 - c1969 Made in USA by Acumath for: Fullerton Engineering Sales Co. Front Scale: K, A [ B, CI, C ] D, L Back Scale: None Donated by Pamela Lanier Wolfe Browne, Kernersville, North Carolina This slide rule belonged to Pamela Lanier Wolfe Browne (1948 - ). In 1966, she began working as a secretary for the Onondaga County Department of Transportation, Division of Engineering, Syracuse, NY. She studied drafting in her spare time and on April 26, 1969 she took the Engineering Aid I civil examination. When she received her grade she was informed that she was the first woman in NY State to pass the exam and fill the position. On October 24, 1970 she passed the Engineering Aid II exam. She used this slide rule 1969-1971 while working on highway projects in the office. After much pleading with her boss, the Transportation Commissioner, he finally permitted her to work in the field with fellow male engineers conducting traffic counts. Note: Pamela is the widow of Harry Edson Browne (1933-2006). They were married in 1985. Harry Browne was an inspirational speaker who wrote 19 books that sold more than 2 million copies. In 1996 and 2000 he was the nominee of the Libertarian Party for President of the United States. |
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 Fullerton 1450 Acudial Version 1 (Concise 28N) ISRM 14.01.10.06 |
Fullerton 1450 Acudial Version 1 (Concise 28N) Made in Japan by Concise - 8.4cm Dia Front Scale: D ( C, CI, A, K ) Back: Conversions Gift of Bill Wehrend Collection |
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 Fullerton 1450 Acudial Version 2 (Concise 28N) ISRM 14.01.10.07 |
Fullerton 1450 Acudial Version 2 (Concise 28N) Made in Japan by Concise - 8.4cm Dia Front Scale: D ( C, CI, A, K ) Back: Conversions Gift of Bill Wehrend Collection  Fullerton 1450 Manual (2.31MB PDF)
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 Fullerton 1450 Acudial Version 3 (Concise 28N) ISRM 17.08.24.08 |
Fullerton 1450 Acudial Version 3 (Concise 28N) Made in Japan by Concise - 8.4cm Dia Front Scale: D ( C, CI, A, K ) Back: Conversions Gift of Nancy Morris of Tempe, Arizona. Dustin E. Morris Collection Fullerton 1450 Manual (2.31MB PDF)
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 Fullerton 1452 Acudial REF |
Fullerton 1452 Acudial For small business use. Made in Japan by Concise - 10.0cm Dia Front Scale: D ( C, CI, A, K ) Back: Conversions Archive - ebay photo |
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Fullerton 1454 Acudial Image Needed |
Fullerton 1454 Acudial For general engineering and business use. Made in Japan by Concise - 10cm Dia Front Scale: L, D ( C, CI, A, K ) Back Scale: DI, D (ST1, ST2, L ) |
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Fullerton 1455 Acudial Image Needed |
Fullerton 1455 Acudial For general engineering and business use. Made in Japan by Concise - 10cm Dia Front Scale: L, D ( C, CI, A, K ) Back Scale: DI, D (SI, TI1, TI2, SITI ) |
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Fullerton 1456 Acudial Image Needed |
Fullerton 1456 Acudial For general engineering and business use. Made in Japan by Concise - 10cm Dia Front Scale: A, D ( C, CI, B, K ) Back Scale: L, D (S, T1, T2, S&T ) |
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 Fullerton 1458 Acudial (Concise 300) REF |
Fullerton 1458 Acudial (Concise 300) For Expert Engineering Use Made in Japan by Concise - 11.0cm Dia Front Scale: K, A, D ( C, CI, B, L ) Back: LL3, LL2, D (C, S, T1, T2, ST ) Archive - C. Hamann Collection, Germany |
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Fullerton 1499 Stadia Computer Image Needed |
Fullerton 1499 Stadia Computer Made in Japan by Concise - 10cm Dia Front Scale: D ( sin, cos, cos2) Back Scale: D (C, S, ST, L ) |
 Gemini Engineering Caliputer REF |
Gemini Engineering Caliputer Made in USA by Gemini Engineering, Houston, Texas. - c1967 Note:material is stainless Steel. 1959 U.S. Patent No 2,874, 478 Invented by Thomas P. Faulconer of Rancho Sante Fe, California. Front Scale: 4in [ Depth Venier 0-25, Outside, Venier 0-25, C ] Back Scale: 13cm [ B Squares and Square Roots, Read Circular Areas] Archive - Ebay Photos 
 Instructions and 1970 Advertisement in The Rotarian. |
 Variable Scale: Evolution |
  Brochures |
 | H. Joseph Gerber - (1924-1996) United States. Inventor/businessman. Gerber immigrated to Hartford, Conn., from Austria in 1940, and completed high school in two years while working full time. 1947 graduate from Rensselaer Polytechnic Institute. Gerber's first patented invention was the Gerber Variable Scale, which he conceived in 1945 while he was a college student. He built the product in his garage. Leaving his job a few years after graduating, he drove around America for months at a time to visit engineering departments of military and industrial organizations. He sold his existing products by day, and invented new ones at night. It was the first product to launch the Gerber Scientific Instrument Co. Gerber, who held nearly 650 patents, was awarded the National Medal of Technology in 1994, given to him by U.S. President Bill Clinton. Several of his inventions are on display at the Smithsonian Institution. The story of his invention The Inventor's Dilemma: The Remarkable Life of H. Joseph Gerber was written by his son, David J. Gerber. (Yale University Press, 2015) |
 Gerber Variable Scale Model TP007100B ISRM 20.08.24.01 
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Gerber Variable Scale - Type TP007100B Made in USA - Gerber Scientific Instrument Company Scales (23.5 cm): R1, I, L10 Original owner: Peter Stanek (1937-2014), mathematician, purchased c1960 Gift of Jean Bee Chan and Kenneth Ross of San Rafael, California. Notes: The heart of the Variable Scale is a high precision triangular spring whose coils act as calibrating lines. When extended, all coils are equally spaced. A second spring carries numerical markings for each 10th coil of the triangular spring. Easy to use, the Variable Scale makes computations directly -- without conversion -- on graphs, curves and recordings. Expandable for any ratio, any setting, it is used on graphical work where reading, plotting and interpolating are required. The use extends the Variable Scale's springs by sliding a hairline over three fixed, engraved scales: 1) an Inch scale that indicates the number of inches extended; 2) a Reciprocal scale that identifies the number of coils per inch; and 3) a Logarithmic scale that indicates the logarithm of the extension. Each scale, in combination with the spring, solves a group of common problems. by Rod Lovette |
 Gerber GraphAnalogue Model GA-103 ISRM 16.05.10.01 
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Gerber GraphAnalogue GA-103 Made in USA - Gerber Scientific Instrument Company Scales: RI, RF, RC,I, F, CM, T, T, S(Sin)C(Cos), D(Degree Scale), ()2, ()2,()1/2,()1/3, L10, Le, Le, P Notes: The heart of the Variable Scale is a high precision triangular spring whose coils act as calibrating lines. When extended, all coils are equally spaced. A second spring carries numerical markings for each 10th coil of the triangular spring. Donated by Marie Sayre Cole of Wappingers Falls, NY, Daughter of C.L. Sayre Jr. 
He graduated in 1947 with a B.S. in mechanical engineering from Duke University and was commissioned as an ensign in the US Navy. He served on the USS Hobson (DMS-26) until 1949.
He then attended Stevens Institute of Technology completing his M.S. in mechanical engineering, specializing in fluid mechanics. He was recalled to active
duty as Lieutenant JG in the US Navy in 1952 due to the Korean War He joined
the University of Maryland faculty as an assistant professor in 1955 and received his Ph.D. in 1961. He
continued on the faculty at University of Maryland through 1987 as a full professor and served as
associate Dean of Engineering for several years during his tenure. He authored an early book on computer aided design in 1985; "Design and Graphics Using
the Apple Computer, an Engineer's Guide." In 1993, he was
appointed Professor Emeritus of Mechanical Engineering, University of Maryland and in 1998 received
an A. James Clark School of Engineering Outstanding Commitment Award. Full Biography (pdf). This specimen was given as a gift to John Hopkins University directly by. H. Joseph Gerber march 10, 1953. See Letter.
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 Gibson-Springs Spring Data Computer - 1938 ISRM 13.00.00.77 |
Gibson-Springs Spring Data Computer - 1938 Made in USA by William D. Gibson Co 1800 Clybourne Ave,Chicago, Ill. (also a division of ASC). Front Scale: W/f ■, ● [ N (Number of Coils), G (Torsional Modulas), D (Mean Diameter) ] d (wire Diameter) Back Scale: Front Scale: W ■, ● [ S (Stress), K/C, D (Mean Diameter) ] d (wire Diameter) |
Gisholt Machine Co. Gisholt Time Computer REF S415 |
Gisholt Time Computer Made in USA By Gisholt Machine Co., Madison, WI This is thought by some to have been made by Richardson, but it is based on a 10-10-1920 patent, that alters from Richardson's, by having two slides.
All sheet steel construction, dual nested slides. |
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 Gisholt Time Computer REF |
Gisholt Time Computer Made in USA By Gisholt Machine Co., Madison, WI This is thought by some to have been made by Richardson, but it is based on a 10-10-1920 patent, that alters from Richardson's, by having two slides.
All sheet steel construction, dual nested slides.
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 Gisholt Time Computer ISRM 18.07.11.14 |
Gisholt Time Computer Made in USA By Whitehead-Hoag, Newark, NJ for Gisholt Machine Co., Madison, WI All plastic film construction, dual nested slides. Front Scale: G(RPM), F(Time) [ E(Length), B(Dia) ] [ A(Cutter Dia), C(Speed-FPM) ] D(Feed) Back: Advertisement Gifted by Phil Stanley of Worcster, Massachussettes
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Globemaster®| The Globmaster® name was first registered (#0932070) as a trademark in 12-10-1959 and expired in 2-5-1992. The correspondent listed for GLOBEMASTER is JOHN D. GOULD of Merchant, Gould, Smith, Edell, et al, 3100 Norwest Center, 90 South Seventh Street Minneapolis, MN 55402 . The GLOBEMASTER trademark is filed in the category of Paint Products , Lubricant and Fuel Products , Pharmaceutical Products , Machinery Products , Firearm Products , Paper Goods and Printed Material , Houseware and Glass Products , Yarns and Threads , Clothing Products , Lace, Ribbons, Embroidery and Fancy Goods , Meats and Processed Food Products , Smoker's Products . The description provided to the USPTO for GLOBEMASTER is OIL CANS. In 1971, a U.S. federal trademark registration was filed for GLOBEMASTER by TROPHY PRODUCTS, INC., HOUSTON 77055. |
 Globemaster 62200 5 inch slide rule ISRM 20.04.01.320 |
Globemaster 62200 5 inch slide rule Made in Japan - Compare with Santok and other Generic slide rules in the Japan gallery Front Scale :A [ B, CI, C ] D, K Back: Blank Gifted by the Philip Stanley Collection. 
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 Globemaster 62205 10 inch slide rule ISRM 14.07.02.34 |
Globemaster 62205 10 inch slide rule Made in Japan Front Scale :S, K, A [ B, CI, C ] D, L, T Back: Blank Gifted by the Ed Millis Collection, Dallas, Texas. 
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 Stephenson-Pfahl Hardenability Slide Rule ISRM 19.10.27.02  
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Stephenson-Pfahl Hardenability Slide Rule - 1944 Made in USA by Graphic Calculator Co. for Carnigie-Illinos Steel Corporation. Note: Riveted assembly in folding wallett Front Scale: C (Carbon) [Mn - Manganese] [P - Phosporus] [S - Sulphur] [SI - Silicon] [NSI - Nickel] [CSR - Chromium] [MSO Molybdenum] [V - Vanadium] [Grain Size] [blank] [For Percentages, For Multiplication] Ideal Critical Diameter, Jominy Distance] Slide Chart: The End-Quench Hardenability Curve Chart and Instructions. Back adv:USS Carilloy Alloy Steels.. Belonged to Thomas C. Graham, Sr. 
 Gift of Thomas C. Graham,Jr. President and CEO of Hotwork-USA. This specialized slide rule belonged to Thomas C. Graham Sr. who is widely known as one of the steel industry's most successful and innovative executives. A former draftsman and civil engineer, he was named president of Jones & Laughlin Steel Corp. in 1974. In 10 years, he took the company through a merger with Youngstown Sheet & Tube Co., and then an acquisition of Crucible Steel's Midland plant. He departed J&L in 1983 to restructure the United States Steel Corporation, where he served as president of the U. S. Steel Group of USX Corp. until 1991. Over that period, finished products went from 8 man-hours per ton down to 4 man-hours per ton, contributing to a dramatic swing in profitability for the company. Graham had similar results as chairman and CEO of Washington Steel Co. (1991-1992). From 1992 to 1994, Graham Sr. was president and CEO of Armco Steel Co. L.P., predecessor of AK Steel. He was the founder and served as chairman and chief executive officer of AK Steel Corp. (1994-1995), and remained as chairman until his retirement in 1997. After his arrival at Armco Steel in 1992, the company went from being the least profitable U.S. steel company to earning the most profit per ton, and producing steel with the fewest man-hours per ton, of any of its major competitors over the following five years. He is now with TC Graham Associates as a founding member.Mr. Graham is a Korean war veteran. |
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 General Motors Truck Performance Calculator ISRM 19.10.26.02 (Note: tagged as 19.10.27.02) |
General Motors Truck Performance Calculator - 1946 Made in USA by Graphic Calculator Co. Note: Riveted cardboard construction Front Scale (Nested slides) Engine Rev per minute,Loaded Rolling Radius, % Grade on Concrete [ A Gear Ratio, C Indirect Gear, [ Speed in MPH, Torque in Lbs Ft, ] B Gross Vehicle Weight lbs ] Rim Pull-in lbs direct gear, Indirect Gear) Back scale: D [ E Dirt, Rough Dirt, Worn Gravel,Good gravel, Concrete (Road resistance) Back adv:General Motors Overseas Operations, New York. Gift of Philip Rodley of Upperhutt, New Zealand |
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 Concrete Volume Computer ISRM 17.09.14.02 |
Concrete Volume Computer - 7 inch long c1936-1953 Made in USA by Graphic Calculator Co. ( or?) Front Scale: A(Thickness) [ B(Width), C(Length) ] D(Cubic Yards) Back adv:Stewart & Nuss, Inc, 410 Thorne, Fresno, CA Phone: 2-3125 Gift of Michelle Black, belonged to father John Black, Morro Bay, California |
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 Concrete Volume Computer REF P212 | Concrete Volume Computer 1995 - 8 inch long Made in USA by Graphic Calculator Co for Louis Gerson Co, Middleboro, MA 02346 Front Scale: A(Thickness) [ B(Width), C(Length) ] D(Cubic Yards), E(Dia-Inches) Back Scale: Estimates for cubic yard Back adv: Lyman-Richey Sand & Gravel, Omaha, NB 68131 |
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 Gerson Bituminous Concrete Calculator ISRM 12.09.26.61 | Gerson Bituminous Concrete Calculator - 7 inch long Made in USA by Graphic Calculator Co. for Gerson Co, Mattapan, Massachussettes ©1953 Front Scale: A(Length-Feet) [ B(Width-Feet), C(Thickness-Inches)] D(Weight-Tons) Back adv: Economy Ready-Mix Concrete Co., Waukegan, Illinos Donated by the Huang Collection |
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 Proportional Slide Rule ISRM 12.09.26.62 | Proportional Slide Rule (c1950) Made in USA by Graphic Calculator Co Front Scale: A (Copy Dimension) [ B (Engraving Dimension), C (Dimensions larger than 12) ] D (Dimensions larger than 12) Back adv: Warner Bros. Co. 3330 Birch St. KE6-3882 (Connecticut phone exchange?) Donated by the Huang Collection |
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 Graphic - Percentage Calculator C23 |
Graphic - Percentage Calculator Made by Graphic Calculator Co., Barrington, Illinois - 1962 6in (15cm) Dia Plastic Film disc Front Scale: Sales ( % of Sales) or Number ( Percent ) Donated by Jack Rababeh, Senior Engineer at ASC |
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| Stock Yield Slide Rule Made in USA by Graphic Calculator Co for Lamson Bros &Co. Fort Dodge, Iowa Front Scale: Price [ Annual Dividend, Dollars] Percentage Yield Back slide: Commission Rates Donated by Nancy Day in Kansas City, Missouri
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 Graphic Calculator - Profit Finder C25 |
Graphic Calculator - Profit Finder Made by Graphic Calculator Co., Chicago, Illinois - 1954 8in (20.2cm) Dia Plastic Film disc Front Scale: # of Items, Selling Price ( Markup, Profit ) Donated by Jack Rababeh, Senior Engineer at ASC |
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Samuel S. Dannaway, PE, is a registered fire protection engineer and mechanical engineer wrote an article that stated :"Many years ago, students in the fire protection engineering curriculum at the University of Maryland were given the Grizzle Stick to assist them in their hydraulics classes. Those courses were ENFP 312 Fire Protection Fluids, which I took in the fall of 1976, or ENFP 310 Fire Protection System Design I, which I took in the spring of 1977." Note: B.F. Grizzle slide rules are duplicated in the Lawrence Gallery. |
 Lawrence - Water Line Capacity Slide Rule, B.F. Grizzle ISRM 14.07.02.88 |
Lawrence - Water Line Capacity Slide Rule, B.F. Grizzle Made in USA by Lawrence for B.F. Grizzle, Copyright 1944 Front Scale: Inside Pipe Diameter [ Length of Line, Flow Rate CuFt/Hr, Gallons/24Hr] Coefficient of Roughness, Loss of Head, Pressure drop] Back: Not Shown Gift of Ed Millis, Dallas, Texas |
 B.F. Grizzle Water Line Capacity Slide Rule |
B.F. Grizzle Water Line Capacity Slide Rule (1971) Made by B.F. Grizzle Co., Washington, DC. Copyright 1944, renewed 1971 8in (20.2cm) Sandwiched slide chart tyrp construction Front Scale: Nominal Pipe Size, Inside Diameter- inches [Length of Line in Feet, Cubic Feet per Second, Gallons per 24 hrs, Gallons per Minute ] Coefficient of Roughness, Loss of Head in Feet, Pressure Loss - Lbs. per sq. In. Back: Instructions Gift of Ed Millis, Dallas, Texas 
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 Lawrence - Gas Pipe Line Slide Rule, B.F. GrizzleISRM 18.03.20.05 |
Lawrence - Gas Pipe Line Slide Rule, B.F. Grizzle Made in USA by Lawrence for B.F. Grizzle, P.O. Box 126, Terre Haute, Indiana, Copyright 1944. Note: has K&E cursor Front Scale: B (Inlet Gauge Pressure), A (Outlet Gauge Pressure)[ A1 (Outlet Gauge Pressure), C (Pressure Ext.), Q (Cu. Ft per Day), L (Length in Miles)] D (Inside Diameter -inches), Spec. Gravity, Pressure Base, E, F (Pressure Extension), H (% line Looped) Back Slide: BI(Outlet Gauge Pressure), CI(Pressure Ext.), K (Equivalent Length per Mile of Loop), R, M, G (% Increase Capacity), DL (Diameter of Loop Line) Belonged to Robert N. Curry. Gifted by his friend Alice Bowling of Louisville, Kentucky. 
Robert N. Curry He was a 1949 graduate of Western Kentucky University. Bob was the head of Measurement for Texas Gas Transmission Corp and authored a book on Natural Gas processing Fundementals of Natural Gas Conditioning. He was former chairman of the AGA Transmission Measurement Committee. Several of his slide rules are currently in the ISRM galleries. |
 REF Lawrence - Low Pressure Gas Line Flow Capacity Slide Rule, B.F. Grizzle |
Lawrence - Low Pressure Gas Line Flow Capacity Slide Rule, B.F. Grizzle Made in USA by Lawrence for B.F. Grizzle, Copyright 1941 Front Scale: Length of Line, Specific Gravity [ Pressure drop (Inches), Pressure drop (ounces), Cubic Feet/Hr (B, A,)] Nominal Pipe Diameter (A, B) Back: Not Shown Archive - Scan donated by David Rance collection. Sassenheim, The Netherlands |
 GUCO No.139 Mannheim Pocket Slide Rule ISRM 18.04.06.147 |
GUCO No.139 Mannheim Pocket Slide Rule Made in USA - Thin Film stock and slide (similar to C-Thru design). Dimensions: 6-1/2 in x 1-1/4 in Front Scale: A [ B, CI, C ] D Back of slide: Fractional to Decimal equivalents Back: 6 inch, 15.3 cm Back Promo: BCS Associates. Gift of the Leroy Hausler Collection. |
 GUCO No.300 Concrete Estimator Pocket Slide Rule REF |
GUCO No.300 Concrete Estimator Pocket Slide Rule Made in USA - Thin Film stock and slide (similar to C-Thru design). Dimensions: 6-1/2 in x 1-1/4 in Front Scale: A(Thickness) [ B(Width or Height), C(Length) ] D(Cu.Yds.), E(Diameter in Inches) Back of slide: Fractional to Decimal equivalents Back: Instructions. Back Promo: CalMat Co. |
 No. 371 Concrete and Lumber Estimator ISRM 16.06.02.09 |
No.371 Concrete and Lumber Estimator Made in USA - Maker Unknown Thin Film stock and slide (similar to GUCO and C-Thru design). Dimensions: 8 in x 1-1/2 in Front Scale: A(Thickness) [ B(Width or Height), C(Length) ] D(Cu.Yds.), E(Diameter in Inches) Back of slide: Lumber Scale in Window Back: Instructions. Back Promo: Warner Bros. Co. Gift of the Donald Bachelor Collection. |
 GUCO No.1004 Date Finder Circular Slide Rule ISRM 18.04.06.146 |
GUCO No.1004 Date Finder Circular Slide Rule Made in USA Dimensions: 4 in Diameter Front Scale: Month, Days (Number of Weeks) Back :Blank Back Promo: Edgewater Automation. Gift of the Leroy Hausler Collection. |
 Guedon Metal pocket (1943) ISRM 12.06.27.01 |
Guedon Metal pocket Made in USA Camden, NJ - all sheet metal construction Front Scale: A [ B, CI, C ] D Front Scale: Conversions Back: 5in(fractions) 125mm Donated by Scott Reynolds of Vintage Calculators, Inc, California. In the MIT Museum, an internal letter dated January 20th, 1943 and signed A.W. Keuffel, the letter reads: "Herewith a Slide Rule known as a Vest Pocket Slide Rule made by Guedon, Camden, New Jersey. I do not think they will have much success selling this rule, because of the inherent disadvantages this metal rules has over our regular Pocket Slide Rule. Nevertheless, at the wholesale price of $.50. I do not see how they are able to make this article. After you have examined it, turn it over to Mr. Schneider for filing with the samples." Another of these was donated by David Hecht, Alexandria, VA and ISRM, in turn,gifted this to the Smithsonian Institute in Washington, DC. upon request. |
 Guedon Metal pocket Version 2 scales (1943) ISRM 20.04.01.249 |
Guedon Metal pocket Version 2 Made in USA Camden, NJ - all sheet metal construction Front Scale: A [ B, CI, C ] D Front Scale: Conversions Back: 5in(fractions) 125mm Gift of Philip Stanley Collection. |
 Guedon Metal pocket Version 3 scales (1943) ISRM 22.07.06.148 |
Guedon Metal pocket Version 3 Made in USA Camden, NJ - all sheet metal construction. Thin sheet plastic cursor. Front Scale: A [ B, CI, C ] D Front Scale: Conversions Back: 5in(fractions) 125mm Gift of Philip Stanley Collection. |
 Guedon 448 Pocket (Thin Film Cursor) - S.G.D.G. MARC ISRM 13.09.16.02 |
Guedon 448 Pocket (Thin Film Cursor) - S.G.D.G. MARC Made in France (Unis standard) for Guedon, 418 Schenectady (SCNDY) St., Schenectady (SCNDY), N.Y. Front Scale: 5in // A [ B, C ] D Back: Blank |
Guedon - S.G.D.G. MARC License ISRM 22.04.29.01 |
Guedon - S.G.D.G. MARC License Made in France (Unis) for Guedon, Schenectady N.Y. Note: Po Box 853 Front Scale: 5in // A [ B, C ] D Back: 13cm Back Promo: Spaulding Fibre Company |
 Guedon - S.G.D.G. MARC License ISRM 14.07.02.94 |
Guedon - S.G.D.G. MARC License Made in France (Unis) for Guedon, Schenectady N.Y. Note: Po Box 223 Front Scale: 5in // A [ B, C ] D Back: 13cm Well: Builders Iron Foundry Ad Gift of Ed Millis, Dallas, Texas. |
Guedon "The Miniature" Vest Pocket Slide Rule (1943) ISRM 20.04.01.256 |
Guedon "The Miniature" Vest Pocket Slide Rule Made in France for Guedon, Camden, NJ. Front Scale: 4.5 inch // A [ B, C ] D Back: 14 cm Gift of Philip Stanley Collection. 
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 Guedon Plastic Pocket P062 |
Guedon Plastic pocket - Closed simplex Made in France for Guedon, Camden N.J. Front Scale: A [ B, C ] D Back: Decimal Equivalents |
 Henschel 1083 (Aristo) 4 Inch (1952) ISRM 20.04.01.150 |
Henschel 1083 (Aristo) 4 Inch dc523 (Mar 1952) Made in Germany Front Scale: 4in // A [ B, CI, C ] D, K Back Scale: [ sin, lg, tg ] Well Promo: Henschel Co. Gifted by Philip Stanley Collection |
 Henschel No.1096 (c1930) ISRM 12.06.18.02 |
Henschel No.1096 Made in Germany by Albert Nestler A.G. Front Scale: 10inch // A [ B, CI, C ] D, K || 25cm Back Scale: [S, L, T ] Back: Conversion Table |
 Henschel 1087-A (c1940) ISRM 20.04.10.392 |
Henschel 1087-A Made in USA (possibly by Roos) for Henschel Co. N.Y. Material: Painted scales on wood Front Scale: A [ B, CI, C ] D, K Back Scale: [S, L, T ] Back: Conversion Table, Printed label. Well: Fraction/Decimal Conversions. Gift of Philip Stanley Collection |
 S197 Henschel 2020P (c1940) |
Henschel 2020P - Duplex Made in USA - possibly by Acu-Rule or Charvoz-Roos. Front Scale: LL0, LL00, A [ B, K, CI, C ] S, ST, T Back Scale: L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2 Warning: Do not clean this model using Windex w/ Ammonia-D. This is not an engine-divided rule and the ink wipes off. (You'd think I'd learn) |
 Henschel 2025 (c1930) ISRM 13.09.15.04 |
Henschel 2025 (c1930) Made in Germany for Henschel Co., N.Y. by Albert Nestler. Note 'Railroad Track' style divisions Front Scale: 28cm // q (%), Z(C) [ T (D), M(CI), D(C), K(D), L || 11inch Back Scale: [ £, s, d ] Back: Equivalents, very faded. Note: Missing cursor. See the above Henschel No.1096 (c1930) for the proper cursor. |
 Hyde Optical Slide Rule (c1939) Photography ISRM 22.04.08.03 
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Hyde Optical Slide Rule (c1939) Photography Made in USA by P.A.S. Co. NY, for Henry Herbert Distibutor. Note 0.010in thick Stainless Steel. Sold for $1.50 in 1939 See Radio and Television Ad. Front Scale: Focal Length inches, Relative Hyperfocal Distance [ 6in, Apertures in f stops, Diameters Enlargement, Hyperfocal Distances, 15.2cm ] Object Distance ft. Back::Instructions Back Slide: Equivalents Gift Of Penelope Anne Martell of San Jose, California. Belonged to her grandfather Milo Higgs Weston, Milo Higgs Weston, Born in 2 Oct 1882 and died in 19 Nov 1964 Oakland, California. Worked as a Mechanical Engineer for the Southern Pacific Company, Penelope included some old photos from the 1920's with the bio. The San Francisco Public Library has a collection of color slide by Milo and his daughter Clara M. Weston Martell (b.1918 d.2001, Penelope's Mother, Father:Gerald Martell) from 1939-1940. Son William H Weston (b1921). other Daughter Charlotte E Weston (c1923). California San Francisco Public Library Collection |
Human Factors Research, Inc.
 Human Factors Research Statistics c1960 ISRM 20.04.01.313 |
Human Factors Research Statistics Made in USA (possibly by Pickett) by Human Factors Research, Inc.. Note Painted aluminum laminated construction. Front Scale: 3 Statistical Scales [ 3 Statistical Scales ] 3 Statistical Scales Back Scale: K, A [ B, CI, C ] D, L Gift of Philip Stanley Collection 
Pickett manufactured the Pickett N-525 Stat-Rule and the manual was written by by William Harris Ph.D.of
Human Factors Research, Inc. It is very possble that Harris had Pickett make the above slide rule first and then Pickett decided to add the scale set on their regular slide rule line. |
 
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On an October 4, 1938 letter from A.W.Keuffel to W.L.E.Keuffel, AWK writes:"Mr. Misik advises that one of our employees, Mr. Katzenmair, informed him that the makers of the INDECO Rule, which was made in Bridgeport, Ct., have gone out of business. Mr. Katzenmair received this information from someone acquianted with the owners of INDECO, who advised him that the owner had spent all of his wife's money in promoting this rule without success and had finally given up making them." Courtesy of the MIT Museum who received the K&E archives. K&E kept track of all their competitors. The instructions sheet shows the actual company name. On the left is a January, 1934 INDECO Slide Rule ad in Boys Life Magazine, the official publication of the Boy Scouts of America. |
 Indeco Pocket Slide Rule (1934) ISRM 13.09.12.01 |
Indeco Pocket Slide Rule (1934) Made in USA - Stainless Steel sheetmetal stock and celluloid slide. Riveted cursor Dimensions: 1/4 in x 6 in x 3/4 in Front Scale: A [ B, C ] D Back: Blank Note: This was the first design and came with a leather sleeve. |
 Indeco Pocket Slide Rule (1938) V2 ISRM 21.11.06.01 |
Indeco Pocket Slide Rule (1938) Version 2 Made in USA - Stainless Steel sheetmetal stock frame and plastic scales, with.simplified cursor. Note: back is stamped "Pat. Pend.", but there is no record of one being issued. Dimensions: 1/4 in x 6 in x 3/4 in Front Scale: K, A [ B, S, T, C ] D, L Back: Blank  (3.9MB PDF)
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 Indeco Monoface Pocket Slide Rule (1938) REF |
Indeco Monoface Pocket Slide Rule (1938) Made in USA - Stainless Steel sheetmetal stock and metal slide. Note: the model name of "Monoface" which is also used on the DECO Monoface 10 inch slide rule. Note: back is stamped "Pat. Pend.", but there is no record of one being issued. Dimensions: 1/4 in x 6 in x 3/4 in Front Scale: K, A [ B, S, T, C ] D, L Back: Blank Note: this was the second, most complex and final design before the company went out of business. Archive - photo courtesy of the MIT Museum Collections |
 DECO Monoface 10in Mannheim ISRM 21.11.03.03 |
DECO Monoface 10in Mannheim Made in USA - Stainless Steel cursor on mahagony and celluloid stock. Note: the model name of "Monoface" which is also used on the MIT version of the 6 inch slide rule. Dimensions: 1/4 in x 11 in x 1-1/2 in Front Scale: K, A [ B, S, T, CI, C ] D, L Back: Blank celluloid. Note: Its unknown when this version appeared, but it uses the Version 2 style of cursor. Gift of Karen Eccks of La Mesa, California. 
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Jones Metabolism Equipment Co was founded in 1919 by Horry Jones, M.D, Ph.D., It was inspired by a friendly wager with a colleague while at a scientific conference, Horry Jones, M.D, Ph.D. He successfully developed the "Metabolimeter", the first waterless Basal Metabolism Test instrument. This significant development led to the establishment the Jones Metabolism Instrument Company in Chicago, Illinois and ultimately the widespread availability of metabolic testing. The address at 315 Honore Steet was listed in the 1959 Chicago newspaer ad. The slide rule was used, along with a paper chart to determine the metabolic values. In 1960, William C. Jones, recognizing the need for improvement in current spirometer design to achieve widespread access to patient testing, he followed in his father's footsteps,developing the :Pulmonor", the first waterless spirometer, marking the beginning of the Jones Medical Instrument Company. |
 Jones Metabolism Rate Slide Rule ISRM 21.07.21.01 |
Jones Metabolism Rate Slide Rule c1937-1950 Made in USA - Designed by Horry Jones, MD. Sheet metal design made of stainless steel Front Scale: Percent Metabolism Rate [ Time in minutes to consume one standard liter of oxygen, Nude Weight Pounds ] [ Bare Foot Inches Height, Age Group ] Male, Female Back: Directions  |
 Culbertson Oceanographic Slide Rule REF Designed by Margaret F. Culbertson.M.A. Listed as Graduate Research Meteorologist II at Scripps Institution of Oceanography in 1957. At the University of California, La Jolla, School of Science and Engineering Department of Phyaics, She co-authored with Walter M. Elsasser, Atmospheric Radiation Tables, Boston: American Meteorological Society, (1960). Abstract and Introduction, American Geophysical Union, June, 1955 
US2853236 Sept. 23, 1958,
OCEANOGRAPHIC SLIDE RULE FOR DETERMINING SALINITY by M.F. Culbertson
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Culbertson Oceanographic Slide Rule Made in USA by KAHLSICO, Kahl Scientific Intrument Corp, El Cajon, CA (1955) The 8-3/8 inch diameter slide rule is designed to facilitate computation of the three basic quantities of physical oceanography, temperature, depth, and salinity. Scale Symbols and definitions: C = correction for thermal expansion of a protected thermometer system subsequent to reversal Vo = a constant of the individual thermometer, representing in degrees the volume of mercury below the 0° mark when the thermometer is in the reversed position at 0° Centigrade T' = reading of the reversing thermometer, either protected or unprotected t = reading of the auxiliary thermometer which accompanies each reversing thermometer, (that is, temperature at which reversing thermometer is read) K = reciprocal coefficient of thermal expansion of the glass of which the thermometer is made; K is given on the certificate which accompanies each thermometer Cu = correction for thermal expansion of an unprotected thermometer system subsequent to reversal Tw = water temperature in situ, the corrected reading of a protected reversing thermometer C' = value found as an intermediate step in the process of correcting an unprotected thermometer D = depth at which the thermometers reversed Tu = corrected reading of an unprotected reversing thermometer, a function of both temperature and pressure ρm = mean density of the water column above the level of reversal Q = pressure coefficient of the individual unprotected thermometer, expressed in degrees Centigrade increase in the reading per 0.1 kg/cm2 increase in pressure Wire length = length of wire from sea surface to water bottle Wire angle = angle which the Wire makes with the vertical at the ship Scan provided by the Steve Seale's collection |
| The Kel-Co slide rules were the brainchild of A. Stuart Kelsy. They were produced in 1969-1971 in Plainview, NY by Kel-Co Publishing, his own firm. He later designed the Handicapping slide rule and later the 1979 electronic calculators made APF Electronics. |
 A. Stuart Kelsey July 1980 Manufactured & Distributed by APF ELECTRONICS, INC. 1501 Broadway New York, New York 10036 Under license from Cannella Corp., Syracuse, N.Y. ©1979-1980 K-C Associates Pompano Beach, Florida. |
The following text is from the PREFACE to the Electronic Kel-Co calculator Manual (1MB PDF) Read the manual to understand the math behind the slide rules and calculator:
The Kel-Co Class Computer is based upon the
same principles as the Kel-Co Class Calculator (slide
rule). The calculator, first marketed in 1969, became
the most widely used handicapping aid in North
America, and was considered by most unbiased experts
as the most successful ever developed. The electronic
computer, by its very nature, is much easier to
use, more accurate, and much faster than the slide
rule. |
 Kel-Co Class Calculator For Thoroughbred Race Horses ISRM 18.07.11.17 |
Kel-Co Class Calculator For Thoroughbred Race Horses Made in USA - Kel-Co Publishing Plainview, NY - 1969 Front Scale: [ Earnings (Rate)] [ F2 ] FI (Finish Value), S (Show), P (Place) W (Wins) Note: Clever 2-Slide Extruded PVC construction, Cursor with labels. (stuck due to shrinkage) Gifted by Phil Stanley of Worcster, Massachussettes 
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 Kel-Co Class Calculator For Thoroughbred Race Horses S337 |
Kel-Co Class Calculator For Thoroughbred Race Horses Made in USA - Kel-Co Publishing Plainview, NY - 1971 Front Scale: FI (Finish Value), W(#wins) [ T (Track T1, T2, T3, T4), F2 ] [ E (Earnings) ] Note: Clever 2-Slide Extruded PVC construction 
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 Kel-Co Trot Calculator For Thoroughbred Race Horses ISRM 18.07.11.18 |
Kel-Co Trot Calculator For Thoroughbred Race Horses Made in USA - Kel-Co Publishing Plainview, NY - 1969 Front Scale: [ A ] [ Finish Position, Time, Post Position ] B, C Note: Clever 2-Slide Extruded PVC construction, Cursor with labels. (stuck due to shrinkage) Gifted by Phil Stanley of Worcster, Massachussettes 
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Key Line| Note on Instruction sheet: "A KEY LINE EXCLUSIVE IMPORT - ALL RIGHTS RESERVED - SOLE IMPORTER AND DISTRIBUTOR" Obviously Key Line was not the sole importer of Concise slide rules, but maybe at the beginning, they tried. The first sheet of the manual is titled "Key Lines's Concise Circular Slide Rule". The manual is a very early two-sided instruction sheet, folded in 3rds. |
 Key Line's Concise Circular Slide Rule ISRM 14.01.10.08 |
Key Line's Concise Circular Slide Rule Made in Japan by Concise - 8.4cm Dia Front Scale: D ( C, CI, A, K ) Back: Conversions in a radial configuration. Sleeve Advertising: Dole Company, Chemical Division, San Jose, California, 408 292-4484 Gift of Bill Wehrend Collection  Key Line Concise (28N) Inst (1.72MB PDF)
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Kolesch and Company began in the late 1790s with Edmund March Blunt (1770-1862), who was a map maker in Massachusetts in 1793 and moved to New York in 1802.9 His shop in New York sold nautical books and charts, as well as pre-owned nautical instruments. Upon his retirement in 1822, his sons Edmund and George William took over the store by 1824, creating the firm E. & G.W. Blunt. This firm began offering nautical books, charts, and instruments as well as surveying equipment. Edmund began attempts to build a dividing engine in 1831 and successfully created an automated machine that was put into operation by 1857. His Automatic Dividing Engine is one of the first built in the United States, and E. & G. W. Blunt used the machine to manufacture theodolites for the Coast Survey instead of having to import them. The company remained in the family until 1868 at which time the firm, by then known as Blunt & Co., was passed to German immigrants, Eckel & Imhoff, and then F. Eckel. Finally, in 1885, Heinrich Adolph Kolesch (1855-1903) purchased the firm. Kolesch & Company, at 138 Fulton Street, New York, New York, remained in existence until 1947, though it was dissolved by proclamation at that time so it is not clear when they stopped selling instruments. In the early 1900s through roughly 1920, Kolesch sold drawing instruments and materials, surveying instruments, and accessories including slide rules. These rules are described in their catalogs from those years, which can still be found today, as well as in their publication, How To Use Slide Rules. Their slide rules were engraved with the Kolesch name, but were likely all imported. While never stated explicitly, these rules appear likely to have been manufactured by Albert Nestler in Germany. Courtesy of Mike Syphers
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Kolesh Co. 2580 15in Mannheim 1905-1911 ISRM 22.02.03.01 |
Kolesh Co 2580 15in Mannheim 1905-1911 Made in Germany by Albert Nestler Front Scale: 14in // a [ B, C ] D || 37.5cm Back Scale: S, L, T Well: 37.5cm - 75cm |
 Kolesh Co. 2574 10in Mannheim 1905-1911 REF |
Kolesh Co 2574 10in Mannheim 1905-1911 Made in Germany by Albert Nestler Front Scale: 10in // a [ B, C ] D || 27.5cm Back Scale: S, L, T Well: 27.5cm - 55cm Scan provided by the Mike Syphers Collection |
 Kolesh Co. 2713 10in Stadia 1905-1911 REF |
Kolesh Co 2713 10in Stadia 1905-1911 Made in Germany by Albert Nestler Front Scale: 10in // L, A [ DF, Sin-Cos, C ] D, B || K Back Scale: S, S&T, T Well: 27.5cm - 55cm Scan provided by the Mike Syphers Collection |
 Kolesh Co. 10in Triplex 1905-1911 ISRM 22.03.25.01 |
Kolesh Co 10in Triplex Mannheim 1905-1908 Made in Germany by Albert Nestler DR Patent173660 Front Scale: 10in // A, D [ DF, B ] C, K || 27.5 Back Scale: S, S&T, T Well: 27.5cm - 55cm Belonged to M.V. Stewart (engraved on slide). |
 Kolesh Co. 2832 10in Triplex 1905-1911 REF |
Kolesh Co 2832 10in Triplex 1905-1911 Made in Germany by Albert Nestler Front Scale: 10in // A, D [ DF, B ] C, K || 27.5 Back Scale: S, S&T, T Well: 27.5cm - 55cm Scan provided by the Mike Syphers Collection |
Walter J. Kudlaty  Kudlaty Press Tonnage Calculator 1949 ISRM 12.09.01.02 |
Kudlaty Press Tonnage Calculator Made in USA - Designed by Walter J. Kudlaty - 1949 Front Scale (BENDING) Metal Thickness, A (Tonnage Required per Linear Ft.)[ B (Female Die Opening), Material, C (BlankingLength), Material ] Metal Thickness, D (Tonnage Required to punch hole) Back Scale (DRAWING) Area, E (Tonnage Required) [ F (Tonnage Required), Material, Blankholding Index, G Metal Thickness, H (Blankholding Tonnage Required) Donated By Laurie Deiter of Louisville, Colorado, in memory of father H. McFadden
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Lakeside Industries Inc., Minneapolis, Minnesota
Lakeside Industries (later Leisure Dynamics, Inc.) also made famous toys like the 'Gumby' doll and 'Gumby's Pal, Pokey' (a horse) under royalty. The lighted table was used in other drawing products like "Heroes of the West", Disney characters, fashion designer and custom styling, and board games like "Aggravation".
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 Lakeside Draft-A-Plan Pocket Slide Rule (1962) ISRM 15.03.19.01 
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Lakeside Draft-A-Plan with Pocket Slide Rule (as part of kit) Kit was made by Lakeside Toys, a subsidiary of Lakeside Industries, Inc Made in USA by Engineering Instruments, 1962 Front Scale: A [ B, CI, C ] D, K
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Founded by German immigrant Adolph Lietz (1850-1923).
The A. Lietz Co. was an American manufacturer of Engineering, Surveying, Mining and Nautical Instruments Instruments.
The firm incorporated in 1892 under the name "The A. Lietz Company". Based in San Francisco, California, their building burned down in the 1906 earthquake and was rebuilt. In 1910 a complete line of drafting materials, including slide rules, and engineering equipment was added. They rebranded slide rules made in the United States, Germany, England and Japan, the models changing during the pre and post WWII era. In 1947, after 65 years
of production, the firm discontinued the manufacturing of surveying instruments and begins to market Sokkisha instruments, made in Tokyo. Their business changed to being an importer and distributor. The Frank Paxton Company purchased the business in 1965 and moved its headquarters to Kansas City, Missouri. The company name was changed to "The Lietz Company." In 1980, Sokkisha acquires Lietz and establishes divisions in Australia and Europe. The Lietz distribution center moves to Overland Park, KS. In 1990 Sokkisha celebrates 70th anniversary and changes its name to SOKKIA. Lietz sold re-branded slide rules manufactured by foreign companies Relay/Ricoh, Concise, Sun Hemmi (Japan) and Faber-Castell (Germany) as well as American compaines like Gilson, Lawrence and Pickett. It is not known, at this point, when slide rules dissapeared from their catalogs.
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1894Science and Engineering magazine |
 189315pages 13MB PDF |
 189717pages 16MB PDF |
 19088pages 12MB PDF |
 19112pages 386KB PDF |
 191917pages 762KB PDF |
 192623pages 685KB PDF |
 193814pages 9.72MB PDF |
 Lietz 2971-N (c1950) ISRM 11.12.03.01 |
Lietz 2971-N - post WWII Made in Japan by Sun Hemmi Front Scale (extended) 5 in // A [ B, CI, C ] D Back Scale: [ S, L, T ] |
 Lietz 2971-P Rietz ISRM 09.01.12.118 |
Lietz 2971-P Rietz - date code 57-11 (Nov 1957) Made in Germany by Faber-Castell Front Scale (extended) 11 cm, 4 in // K, A [ B, CI, C ] D, L Back Scale: [ S, S&T, T ] Donated by David Hecht |
 Lietz 2971-P Rietz U.S.A. - Version 2 ISRM 12.03.02.17 |
Lietz 2971-P Rietz U.S.A. - Version 2 Made in U.S.A. by Charles Bruning Front Scale (extended) 12.5cm // A [ B, CI, C ] D, K \\ 5 in Back Scale: [ S, L, T ] Original owner: Walter Francom, 120-8th Ave, San Francisco (marked on case and name on slide rule). Donated by Richard Davis, Las Vegas, Nevada |
 Lietz 2971-P Pocket Rietz - Version 3 ISRM 20.04.01.296 
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Lietz 2971-P Pocket Rietz - Version 3 (Inch Scale) Made in Denmark for A. Lietz Co.. Front Scale: 5 inch // K, A [ B, CI, C ] D, L Back Scale: [ S, S&T, T ] Back: 13 cm, Lietz Logo Gift of Philip Stanley Collection.  PDF
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 Lietz 2971-P Pocket Mannheim - Version 4 ISRM 20.04.20.01 |
Lietz 2971-P Pocket Mannheim - Version 4 (CM scale) Made in Denmark for A. Lietz Co.. Front Scale: 11cm, 5 inch // K, A [ B, CI, C ] D, L Back Scale: [ S, S&T, T ] Back: Lietz S.F,; L.A. Logo Gift of Wayne Farmar.  EN and DE - PDF
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 Lietz 2972 4inch Pocket Mannheim ISRM 20.04.01.213 |
Lietz 2972 4inch Pocket Mannheim (pre-WWII) Made in Germany (Nestler?) for A. Lietz Co.(pre-WWII) Front Scale: K, A [ B, CI, C ] D, L Back Scale: 5 inch [ S, L, T ] 10 cm Back: Lietz Logo Gift of Philip Stanley Collection. |
 Lietz 2974N (re-branded Hemmi 40) Ebay Listing Photo 
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Lietz 2974N - Same as Hemmi 40 c1937 Made in Japan by Sun Hemmi Front Scale (extended) A [ B, C] D, Back Scale: [ S, S&T, T ]  Ref:S261 - Hemmi No. 40 |
 Lietz No.2974N REF |
Lietz No.2974N c1942 Made by Lawrence - c1942 (Same as 10-B) for the A. Lietz Co. San Francisco, California. Material: Painted Scales on Wood Stock Front Scale: A [ B, CI, C ] D, K Back: Not Shown Scan Donated by David Rance, The Netherlands |
 Lietz No.2974N Mannheim ISRM 22.10.15.10 |
Lietz No.2974N Mannheim c1942 Made by Lawrence - c1942 (Same as 10-B) for the A. Lietz Co. San Francisco, California. Note: has magnifying cursor from a Lawrence slide rule. Material: Painted Scales on Wood Stock Front Scale: A [ B, CI, C ] D, K Back: Equivalents and weights of materials. Gifted by David Zoumaras of San Diego, California. |
 Lietz 2975 Mannhiem (UK) ISRM 12.03.02.19 |
Lietz 2975 Mannhiem (UK) Made in England by Unique (U.S.R.C.) Front Scale: A [ B, CI, C ] D, K Back Scale: [ S, L, T ] Well:Decimal Equivalents of Fractions Donated by Richard Davis, Las Vegas, Nevada |
 A. Lietz ALCO 2976 Mannhiem (Nestler Nr.2) c1928 ISRM 22.02.17.01 
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A. Lietz ALCO 2976 Mannhiem (Nestler Nr.2) c1928 Made in Germany by Albert Nestler. Note: Painted scales on wood with thin-film Celluiloid cursor Front Scale: A [ B, C ] D, K Back Scale: [ S, L, T ] Original Owner: Morris E. Bergstrom of Los Angeles, California. Gift of Rand Huggett Family, of Sutter Creek, California. Morris E. Bergstrom (abt1899- ?), was born in Wisconsin, He was the husband of Rand's aunt, Margaret Bergstrom. Morris E. Bergstrom was an engineer and draftsman in the 1930’s and lived in Los Angeles, California. He attended correspondence school through the International Correspondence Schools. His ICS work books are dated 1907, and a page with a typed equipment list has a header; "Mechanical Drawing - High School".The ICS workbooks were titled "Geometrical Drawing #896" and "Excavating, Shoring, and Piling #1050". His signature appears at the top of the 'ALCO' A. Lietz Co. Instruction manual. 
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 Lietz 2976 Mannhiem (USA -Lawrence 10-B) cWWII ISRM 15.04.06.02 |
Lietz 2976 Mannhiem (USA - Lawrence 10-B) cWWII Made in USA by Lawrence Engineering. Shows Pat. Pend. Front Scale: A [ B, CI, C ] D, K Back Slide: Blank Back:white painted background. Blue color text. Decimal Equivalents of Fractions |
 Lietz 3050N ISRM 09.02.28.02 |
Lietz 3050N - Duplex Made in USA by Charvoz-Roos for Lietz - cWWII Front Scale: K, A [ B, S, T, C ] D, DI Back Scale: Fraction/Decimals [ L, C2, C1 ] D1, D2, D Note: This has double length scales making it like a 10 inch slide rule |
 Lietz 3054L REF S124 |
Lietz 3054L - Duplex Made in USA by Lietz - Pre WWII Front Scale: K, A [ B, S, T, CI ] D, L Back Scale: DF [ CF, CIF, C ] D Note: Later models of the 3054L, post WWII, were made by Sun hemmi and later Relay/Ricoh |
 (ALCO) Lietz No.3054N Duplex Trig (1928) ISRM 22.02.28.01 |
(ALCO) Lietz No.3054N Duplex Trig Made in USA by Roos Company for Lietz - c1928 Front Scale: T Cot , DF [ CF, CIF, C, S Cos, ST ] D Back Scale: Equivalents/Fraction table [ B, K, L, C ] Trig identities/formulae Original owner (on sleeve flap): K. Andreas?n, 151 4th St., Salinas (CA), 
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 A. Lietz Co. No.3077 Midget Circular Slide Rule ISRM 21.08.07.20 |
A. Lietz Co. No.3077 Midget Circular Slide Rule (1938) Note: Also displayed in Circular Gallery. Made in USA by Gilson for A. Lietz Co. San Francisco and Los Angeles, Calif. 3 plastic cursors on aluminum disk Front Scales: C,CI,A,K,Log,LL1,LL2,LL3,LL4, Back Scales: Binary, Fraction,Drill,Thread, Millimeter 
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 Lietz Model No 3625-10 Dial Rule (c1964) Ebay Listing Photos |
Lietz Model No 3625-10 Dial Rule (Pickett 101-C) Made in USA by Pickett, 10.2cm dia Aluminum disk with 3 plastic cursors Front Scale: C, CI, A, AF, L, FA, LL2, LL1, DS, DT, M Back Scale: C, S, ST, T, Fractions-Decimal Note: Scale Labels embossed in RED on transparent cursor 
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 Lietz 3625-20 8.4cm REF C06 |
Lietz 3625-20 8.4cm Dia Made in Japan by Concise - 8.4cm[ Dia Front Scale: D ( C, CI, A, K ) Back Scale: equivalents |
 Lietz 3626-25 Stadia Computer 10cm dia 22.07.06.89 |
Lietz 3626-25 10cm dia Made in Japan by Concise rebranded for Lietz company, U.S.A. (also shown in Concise gallery) Front Scale: D, SIN, COS,COS2 Back Scale:: D, ( C, S Cos, T1 Cot1, T2 Cot2, ST ST, L ) Gift Of Cindy Tate of Bozeman Montana. Victor B. Tate Collection. |
| The Master Electric Company was founded in 1920 by Everett Larsh and headquartered in Dayton, Ohio The company built electric motors, electric gear-motors, motor controls and motor brakes. They supplied private industry as well as the U.S. government. In 1958 the company merged with Reliance Electric Co. of Cleveland, Ohio. Master's headquarters and plant in Dayton were closed in 1961, with a loss of 1450 jobs and moved to Columbus, Indiana. Reference: Scott Adamietz and vintagemachinery.org |
Master Electric Co. PocketISRM 20.04.01.385 |
Master Electric Co - Closed simplex Made in USA by Master Electric Co. Dayton, Ohio. Note that this is version has a trig scale on the back of the slide. Front Scale: 5in // A [ B, C ] D Back scale: 13cm [ S, L, T ] Back Advertising: Master Electric Motors Gift Of Philip Stanley Collection. |
 P239 Master Electric |
Master Electric - Simplex Made in USA by Master Electric - Dayton, Ohio Front Scale: 5in // A [ B, C ] D Back scale: [S, L, T ] Back adv: Master Electric Motors |
| Mead Corporation, Hulman Building, Dayton, Ohio. In 1846, Daniel Mead founded the Mead Corporation in Dayton, Ohio. The firm originally manufactured paper, but the company dramatically expanded its product line during the twentieth century. By the time of Daniel Mead's death in 1891, the Mead Corporation was one of the largest paper producers in the United States, with paper mills in Kingsport, Tennessee, Brunswick, Georgia, and Escanaba, Michigan, as well as several plants in Ohio. More Mead Corp. History. During the 1980s, a national recession during the 1980s caused the company to sell off many of its affiliated industries and streamlined its products and services. The company primarily manufactured paper and continued to participate in the electronic storage industry. The Mead Corporation is currently known as MeadWestvaco. |
 ISRM Mead Official Pocket Rule |
Mead Official Pocket Rule Made in Japan. Distributed by Westab, Dayton, Ohio a division of Mead Corp. Front Scale: A [ B, CI, C ] D, K Back: Blank Donated by David Hecht, Alexandria, VA |
  ISRM Mead 98-1114 Official 10 inch Rule |
Mead 98-1114 Official 10 inch Rule Made in Japan for Mead Corp. Dayton, Ohio Front Scale: A [ B, CI, C ] D, K Back Scale: [ S, L, T ] Donated by David Hecht, Alexandria, VA |
Neal Feay Co.
 Neal Feay Model CR-6 Cost Reduction Slide Rule ISRM 20.04.01.426 |
Neal Feay Model CR-6 Cost Reduction Slide Rule Made in United States by Neal Feay Co., Goleta, California. Front (Unit Cost vs. Learning Curves): 95%, 90%, 85%, 83% [ C ] D, 80%, 78%, 75% Back (Average Cost vs. Learning Curves): 95%, 90%, 85%, 83% [ C ] D, 80%, 78%, 75% Gift of Philip Stanley Collection. |
 Neal Feay Model LR-6 (Log-Curvlinear) Cost Reduction ISRM 20.04.01.426 |
Neal Feay Model LR-6 (Log-Curvlinear) Cost Reduction Slide Rule Made in United States by Neal Feay Co., Goleta, California. Front (Unit Cost vs. Learning Curves): 95%, 90%, 85%, 80% [ C ] D, 75%, 70%, 65% Back (Average Cost vs. Learning Curves): 95%, 90%, 85%, 80% [ C ] D, 75%, 70%, 65% Gift of Philip Stanley Collection. 
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 Neal Feay Anofax Computair Direct Vector Computer REF |
Neal Feay Anofax Computair Direct Vector Computer Made in United States by Neal Feay Co., Santa Barbara, California. Front: Mach,temp, Alt, Pressue ( Mach one, Density Altitude ) Speed and Distance Back: Groundspeed, Airspeed, Crab Angle, Winds Archive - Smithsonian Air and Space Museum. |
 Nobema No.F4 Pocket Slide Rule ISRM 20.04.01.059 |
Nobema No.F4 Pocket Slide Rule Made in England by Unique NOBEMA Nobema Drawing Instruments, USA A [ B, CI, C ] D, K Back: blank  Nobema Logo
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 NOBEMA 10-B REF |
NOBEMA 10-B c1942 Made by Lawrence - c1942 (Same as 10-B) for Nobema Drawing Instruments, USA Material: Painted Scales on Wood Stock Front Scale: A [ B, CI, C ] D, K Back: Not Shown Scan Donated by David Rance, The Netherlands |
| The D. Van Nostrand book company, was founded by Dutch American David van Nostrand (1811-1886) (see expanded Biography) in New York City, in 1848. In 1869, "Van Nostrand's Engineering Magazine" was founded, followed later by "The American Chemical Journal". Van Nostrand Publishing also became involved with the building of the Brooklyn Bridge by publishing John A. Roebling's "Long and Short Span Railway Bridges".During the late 19th century, They published books on slide rules as early as 1884.Van Nostrand Publishing initiated a book series on Science. The Science series was edited by George Plympton, professor of physics and engineering at the prestigious Brooklyn Polytechnic Institute. The famous Van Nostrand Science Series had as many as 127 titles when it was completed in 1902. It was claimed that the Van Nostrand Science series helped educate a generation of engineers. The series was still being sold in the 1920s. Prior to WWII, they rebranded OEM slide rules.and packaged them as a point of sales item to sell their slide rule instruction books, such as Speed and Fun with Figures (1922). |
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 D.Van Nostrand Circular Slide Rule, Copyright 1932 15.03.24.01 |
D.Van Nostrand Circular Slide Rule, Copyright 1932 Printed in USA by D.Van Nostrand Co.Inc, New York Front Scale: A ( B ) Back: Instructions |
 D.Van Nostrand Mannheim Type Slide Rule MagnifyingCursor, 1938 Version 1 15.04.03.02  |
D.Van Nostrand Mannheim Type Slide Rule, Magnifying Cursor, c1938 Made in Festus, Missouri by Acu-Rule for D.Van Nostrand Co.Inc, New York Note: This was sold pre-WWII.with a magnifying glass captured by a brass cursor. Front Scale: A [ B, CI, C ] D, K Back Scale:10 inch [ S, L, T ] 25 cm Back: Equivalents/Fraction Conversions (printed paper label glued to stock) 
Note: The instruction manual is the same one written by Paul Jones who founded Acu-Rule slide rule company, and found with many early Acu-Math slide rules. This slide rule was sold as part of an offer to buy their book Speed and Fun With Figures, by T. O'Conor Sloane, J.E. Thompson and H.E. Licks, copyrighted 1922 and published in 1938 for this kit. This is the 1st version of the kit. |
 D.Van Nostrand Mannheim Type Slide Rule New Clear Cursor, 1943 Version 2 15.04.03.01  |
D.Van Nostrand Mannheim Type Slide Rule, New Clear Cursor, 1943 Made in Festus, Missouri by Acu-Rule for D.Van Nostrand Co.Inc, New York Note: This was sold mid-WWII. Because of the war effort and material shortage, the slide rule was cost reduced. the stock was made thinner and the magnifying glass and brass cursor was made of cellulose, glued together. Front Scale: A [ B, CI, C ] D, K Back Scale:10 inch [ S, L, T ] 25 cm Back: Equivalents/Fraction Conversions (printed paper label glued to stock) Note: The instruction manual is the same one written by Paul Jones who founded Acu-Rule slide rule company, and found with many early Acu-Math slide rules. This slide rule was sold as part of an offer to buy their book Speed and Fun With Figures, by T. O'Conor Sloane, J.E. Thompson and H.E. Licks, copyrighted 1922 and published in 1938 for this kit. This is the 2nd version of the kit. 
The above package was received by Theodore A. Ziegler, 36 E. Ely, Alliance, Ohio and was postmarked 2-19-1943. It had a 12 cent stamp on it. Note in the Febuary 1943 issue of Popular Science that they were advertising the magnifying cursor version. I hope Theodore was not dissapointed when he got a different slide rule variation. |
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| John L. Novotni (1893-1966), a blacksmith of Czech descent, is listed in the 1920 census as working in a foundry in Delaware County, Penn. In the 1910s, he worked at an automobile and wagon repair shop in Oaklyn, N.J., with Andrew W. Kelly and John Hornyak, who received a patent (U.S. Patent 1,210,488 issued January 2, 1917) for this design and sold it as the Kelkay Weight Slide Rule by 1920. By 1922 Kelly and Hornyak and Novotni were selling other celluloid rules, such as the Paper Box Board Rule. By 1929 Novotni was selling slide rules under the name of the Novotni Slide Rule Company and was having the rules made of Bakelite. It appears he lived in Chester, PA at that time. In 1937, he moved to Media, Pa. According to Novotni's daughter, Evelyn Novotni Bond, steel companies continued to purchase the Weight Slide Rule until 1992. Smithsonian, National American History Museum |
 Novotni Merchants Percentage Rule ISRM 18.09.29.01 |
Novotni Merchants Percentage Rule Made in USA - Novotni Slide Rule Co. - Chester, PA. Ca. 1917 Patented 1-21-1917 Material: Black layered Fiberboard with a white top Laminate. Front Scale: Retail Price [ PerCent, Cost ] Cost Per, Quantity Back: Blank Note: Very Rare. Only specimen known to exist 
 Patent US 1,210,488 |
 Novotni Weight Slide Rule Early Version ISRM 18.09.29.01 |
Novotni Weight Slide Rule - Dual Slides Made in USA - Novotni Slide Rule Co. - Media, PA. Ca. 1913-1916 Patent pending Material: White Fiberboard Laminate. Front Scale: Thickness [ Width, Length ] [ Shape, Material ] Weight (lbs) Back: Blank Marked Pennsylvania Forge Corp. Tacony, Phil. PA D.C . |
 Novotni Weight Slide Rule (Bakelite) S312 |
Novotni Weight Slide Rule - Dual Slides Made in USA - Novotni Slide Rule Co. - Media, PA. Ca. 1929 Andrew W. Kelly and John Hornyak, "Slide Rule" (U.S. Patent 1,210,488 issued January 2, 1917) Material: Black Bakelite, Gold silkscreen. Front Scale: Thickness [ Width, Length ] [ Shape, Material ] Weight (lbs) Back: Blank Manual recommends this "...for use in a Blacksmith shop" Archive - ISRM has gifted this to the Math History Department of the Smithsonian Institute, Washington, DC. D.C. |
 Novotni Weight Slide Rule (Masonite) S340 |
Novotni Weight Slide Rule - Dual Slides Made in USA - Novotni Slide Rule Co. - Media, PA. ca. 1959 Material: Masonite wood fiberboard, Black on white silkscreen. Front Scale: Thickness [ Width, Length ] [ Shape, Material ] Weight (lbs) Back: Blank Manual changed with the times " ... for use in a Forging shop" |
 Novotni Paper Board Slide Rule 22.03.01.30 |
Novotni Paper Board Slide Rule Made in USA - Novotni Slide Rule Co. - Media, PA. Patent 1-2-1917 Front Scale: Width [ Length, Count ] [ Count Index, Basis Index ] Basis Back: Blank Gifted by Phillip E. Stanley.Collection |
Novotni Machine Time Slide Rule Tooling ISRM 21.08.17.02 |
Novotni Paper Board Slide Rule Tooling Note: Rare partial printing plate, half the length of the original. Assume to have been cut in half to destroy the tool. Look at mirror image to read the scales. Dimensions of wood block: 5 x 2.5 x 1 inch. Cast lead typeface. Made in USA - Novotni Slide Rule Co. - Media, PA. Front Scale: Diameter for lathe or width for Planer [ Length, Feed in Inches ] Average speed in feet per minute, Time (Hours) At this point in time, ISRM can not find any specimens of a Novatni Machine Time Slide Rule. It may have ben a prototype idea that never came to pass. Whatever decision that was made on why they decided not to produce it, can only be speculated on, but at least we evidence of its existence. |
 Ohmite Ohms Law Calculator with Slide Rule ISRM 22.06.17.01 |
Ohmite Ohms Law Calculator with Slide Rule Made in USA - Ohmite Manufacturing Company, Skokie, Illinois. ©1961 Material: Cardboard slide chart Front Scale: Parallel Resistance [ 3 scales)], Standard Slide Rule: A [ B, C ] D Back Scale: Watts, Volts, Amperes [ 3 scales ] Slide: Instructions Dimensions: 7.5 cm x 22.3 cm x 2 cm |
 Paisley Calculator (Aluminum Body) REF: OS 252 |
Paisley Calculator Made in USA - Paisley Calculator Company c1939 Material: Aluminum body, Celluloid Scale Front Scale (length: 20 inches): A [ B ] Dimensions: 4.2 cm x 25.5 cm x 10 cm Archive - Dr. Paul J. Tarantolo Jr.Collection 
This slide rule, designed by James R. Paisley (1901-1960) of Pittsburgh, PA copyrighted the A and B scales of the Paisley Calculator on February 23, 1939 which consists of two white celluloid bands, each about one inch (25mm) wide and twenty inches (50cm) long, that revolve within an elliptical aluminum case. The case has clear plastic windows on both sides. Five green indicator lines appear on each of the windows. The bands are printed with identical logarithmic scales; the left is marked A, and the right is marked B. Two knurled knobs rotate the bands. Large round metal pins inside the knobs can be locked to force the bands to rotate in unison. |
 Paisley Calculator, (Bakelite Body) REF: NMAH 1987.0183.01 |
Paisley Calculator Made in USA - Paisley Calculator Company c1940 Material: Bakelite, Celluloid Scale Front Scale (length: 20 inches): A [ B ] Dimensions overall: 4.2 cm x 25.5 cm x 10 cm Archive - National Museum of Natural History  This slide rule, designed by James R. Paisley (1901-1960) of Pittsburgh, PA copyrighted the A and B scales of the Paisley Calculator on February 23, 1939 whichconsists of two white celluloid bands, each about one inch wide and twenty inches long, that revolve within an elliptical brown and black Bakelite case. The case has clear plastic windows on both sides. Five green indicator lines appear on each of the windows. The bands are printed with identical logarithmic scales; the left is marked A, and the right is marked B. Two knurled knobs rotate the bands. Large round metal pins inside the knobs can be locked to force the bands to rotate in unison. It was built for Paisley Company by Bastian Brothers of Rochester, N.Y. |
 
Joseph Komorous's 1937 Patent US02,073,421.
| The Parisian Novelty Company at 3510 S. Western Avenue in Chicago, was originally established in 1898, by Louis L Joseph, the American born son of a German immigrant. He produced a variety of novelties that could be used in advertising, many based on designs by inventor Joseph Komorous ( ?-1945), who was the manufacturing superintendent. J.Komorous has at least 18 U.S. patents, starting in 1915 through 1938, which include face powder compacts, watch fobs, office products, campaign buttons, and his slide rule Patent US02,073,421 of 1937. This patent is the basis for generic linear slide rules made by the Graphic Calculator Co, Whitehead & Hoag,, and C-Thru as the designs and construction are the same, made of thin 0.5mm(0.020inch) thick plastic. They were either licensed or the patent had expired. The Parisian Novelty Company Building was abandoned in 2008. See Collecting Vintage Compacts for a great history of their company. Joseph Komorous died in 1945 and their is evidence his son Louis J. Komorous filled in at Parisan Novelty as L.J. has a patent issued in 1952. Parisian Novelty became Matchless Parisian Novelty in 2008. |
Parisian Novelty Concrete Calculator (c1938) ISRM 20.04.10.419 |
Parisian Novelty Concrete Calculator (c1938) Made in USA - Parisian Novelty Co., Chicago, Illinois Patent US02,073,421 Inventor: Joseph Komorous, Riverside, Ill. Material: Folded Thin plastic film. Front Scale: A (Thickness) [ B (Height or Width), C (Length) ] D (Cubic Yards) Back: Promo advertising: Newport Ready Mixed Concrete, Telephone VI 7-2198. c1938 or pre 1950 truck image Gift of Philip Stanley of Worchester, Mass.  |
Parisian Novelty Tru-Flight Calculator (1952) ISRM 20.04.10.270 |
Parisian Novelty Tru-Flight Calculator (1952) Made in USA - Parisian Novelty Co., Chicago, Illinois for Tru-Flite Calculator Co., PO Box 429, Oak Park, Illinois Material: 2 x7 inch Folded Thin 0.5mm thick celluloid plastic sheet. Front Scale: Sped, Distance, True Air Speed [ Time Mins, Hours Magnetic Courses Table. Air Temp °C ] D Pressure Altitude Back: Linear scales for reading Sectional Charts and World Aeronautical Charts Gift of Philip Stanley of Worchester, Mass. Note: The Tru-Flight Calculator was copyrighted (IP1254) in June of 1952 by Joseph F. Read |
 Parisian Novelty Co.Cost And Selling Price Indicator ISRM 20.04.10.99 |
Parisian Novelty Co.Cost And Selling Price Indicator c1950 Made in USA - Parisian Novelty Co., Chicago, Illinois Patent US02,073,421 Inventor: Joseph Komorous, Riverside, Ill. Material: Tan Folded Thin sheet plastic film. Front Scale: Cost per dozen, Cost per Unit[ Units, % Profit ] Selling Price per Unit Back: S.C. Johnson & Son, Inc. Racine, Wisconsin. Manufacturers of Johnson 's wax and Glo-coat. The company is one of the oldest family-owned businesses in the U.S, founded in 1886 by Samuel Curtis Johnson. is an American multinational, privately held manufacturer of household cleaning supplies and other consumer chemicals. Gift of Philip Stanley of Worchester, Mass. |
 Parisian Novelty Co.Cost And Selling Price Indicator ISRM 14.07.02.89 |
Parisian Novelty Co.Cost And Selling Price Indicator c1950 Made in USA - Parisian Novelty Co., Chicago, Illinois Patent US02,073,421 Inventor: Joseph Komorous, Riverside, Ill. Material: Folded Thin plastic film. Front Scale: Cost per dozen, Cost per Unit[ Units, % Profit ] Selling Price per Unit Back: Promo advertising: Eckrich Meats Gift of Ed G. Millis, Dallas, Texas |
 Parisan Novelty Co. 6-inch Pocket Slide Rule ISRM 22.07.06.59 |
Parisian Novelty Co. 6-inch Pocket Slide Rule c1950 Made in USA - Parisian Novelty Co., Chicago, Illinois Patent US02,073,421 Inventor: Joseph Komorous Riverside, Ill. Material: Folded Thin-film white plastic sheet. Paper sleeve is typical of their products. Front Scale: 6in, A [ B, CI, C ] D, 15.4cm Back of slide: Decimal Equivalents Back: Promo advertising: GLC Dicalite Filteraids and Filters Well: U.S. Bureau of Standards Circular No.47 Equivalents. Gift of Cindy Tate of Bozeman, Montana |
 Parisan Novelty Co. 6-inch Pocket Slide Rule ISRM 22.07.06.59 |
Parisian Novelty Co. 6-inch Pocket Slide Rule c1950 Made in USA - Parisian Novelty Co., Chicago, Illinois Material: Folded Thin-film Tan plastic sheet. Front Scale:: 6in, A [ B, CI, C ] D, 15.5cm Back of slide: Conversion factors, °F, °C Back: Promo advertising: The Dicalite Company Well: Equivalents. Gift of Cindy Tate of Bozeman, Montana |
Parisan Novelty Co. Pocket Slide RuleISRM 14.10.09.07 |
Parisian Novelty Co. Pocket Slide Rule c1950 Made in USA - Parisian Novelty Co., Chicago, Illinois Patent US02,073,421 Inventor: Joseph Komorous Riverside, Ill. Material: Folded Thin plastic sheet. Front Scale: 6in, A [ B, CI, C ] D, 15.4cm Back: Promo advertising: Dittman And Greer, Inc. Providence, R.I., Reps for Chromolox, Back of slide: Decimal Equivalents. Well: % Rated Watts, HVAC, BTU and Electrical related conversion factors. Gift of Ed Wright |
  Parisan Novelty Co. Cost And Selling Price Indicator ISRM 14.11.10.01 |
Parisan Novelty Co. Cost And Selling Price Indicator c1950 Made in USA - Parisian Novelty Co., Chicago, Illinois Patent US02,073,421 Inventor: Joseph Komorous Riverside, Ill. Copyright 1934 - U.S. Groves and Copyright 1935 J. Komorous. Material: Folded Thin plastic film. 8-1/4 inch long. Front Scale: Cost per Dozen , Cost per Unit[ Set arrow at cost, Selling Price % of Profit ] Selling Price per Unit Back: Promo advertising: Wimmer's Meat Products, Inc. West Point, Nebraska |
 Patrick Corp Model IV Data Log Hyperbolic REF 
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Patrick Corp Model IV Data Log Hyperbolic (1963) Made in USA by PATCO Temple City, California Front Scales: K, &rad;, &rad; A [ B, T, ST, S, C ] D, DI, Th, Sh2, Sh1 Back scales: LL0+, LLO-, LL1+, LL1-, DF [ CF, CIF, L , CI, C ] ] D, LL2+, LL2-, LL3+, LL3- Archive photo 
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| Perrygraf is best known for slide charts which have their own gallery at ISRM (albiet a giant back log of specimens waiting to be scanned). The slide charts show here are a hybrid as they have standard slide rule scales (A,B,C,D) incorporated into the design, and in some cases, an external cursor with hairline. |
 Perrygraph (SPEEA) 15inch Circular Slide Rule Version 1  Richard E. Bateman (1924-2006) Photos: 2005(L) & 1954(R) |
Perrygraph (SPEEA) 15inch Circular Slide Rule Version 1 (1964) Made in USA by SlideCharts/Perrygraf for the Seattle Professional Engineering Employees Assn. Front Rule Scales: CI, C ( D, A, K, L ) Back Conversions: 100-986 Conversion factor (Decimals, Conversion factor) Original Owner: Richard E. Bateman 1924-2006 Gift of his son, Marc G. Bateman of Shoreline, Washington Richard "Dick" Bateman obtained this Pickett in college in 1950. He attended high school in Dayton, Washington. He served from 1942-45 in World War II as a navigator on a B-24 based at Horsham St. Faith in England, flying 26 bombing missions over Europe. He was discharged as a 1st Lieutenant. He married his wife Marilyn in 1945, then went on to graduate from the University of California at Berkeley with a BA in Astronomy. From 1950 through 1989, Richard was employed by Douglas Aircraft Corporation in El Segundo, CA, Boeing in Seattle, WA and the Jet Propulsion Laboratory in La Canada, CA. While at Boeing he graduated in 1963 with a MA in Mathematics from the University of Washington in Seattle. He wrote a book on the early Portuguese explorations of the late 15th and early 16th century, which combined his interest in history with his WWII navigational experience and his career in the field of military and commercial satellite applications. |
 Perrygraph (SPEEA) 15inch Circular Slide Rule Version 2 |
Perrygraph (SPEEA) 15inch Circular Slide Rule Version 2 (1964) Made in USA by SlideCharts/Perrygraf for the Seattle Professional Engineering Employees Assn. Front Rule Scales: CI, C ( D, A, K, L ) Back Conversions: 100-986 Conversion factor (Decimals, Conversion factor) Original Owner: Richard E. Bateman 1924-2006 Gift of his son, Marc G. Bateman of Shoreline, Washington |
 Perrygraph (Litton) 15inch Circular Slide Rule Version 3 |
Perrygraph (Litton) 15inch Circular Slide Rule Version 3 (1964) Made in USA by SlideCharts/Perrygraf for Litton Industries, Vernon, NY. Front Rule Scales: CI, C ( D, A, K, L ) Back Conversions: 100-986 Conversion factor (Decimals, Conversion factor) Gift of Ed Millis |
 Chemical Mixing Calculator ISRM 18.09.07.44 |
Chemical Mixing Calculator ©1964 Made in USA by Perrygraf for Mixing Equipment Co. Note: This is a unique and rare slide chart that uses many slide rule specific scales Front Scales: G/F. LM1, M1, K, A [ B, LM2, M1, CI, C ] D, LL1, LL2, LL3 Slide Back: 1inches, Centimeter, Tables. Back: Instructions Gift of Donald Bachelor Collection |
 W-K-M Valve Sizing Calculator |
W-K-M Valve Sizing Calculator Made in USA by (Perrygraf ?) for W-K-M ACF Industries, Houston, TX. Slide Rule Scales: [ C ] D Belonged to Robert N. Curry. Gifted by his friend Alice Bowling of Louisville, Kentucky.
Robert N. Curry was a 1949 graduate of Western Kentucky University. Bob was the head of Measurement for Texas Gas Transmission Corp and authored a book on Natural Gas processing Fundementals of Natural Gas Conditioning. He was former chairman of the AGA Transmission Measurement Committee. Several of his slide rules are currently in the ISRM galleries. |
 ITT Valve Sizing Calculator |
ITT Valve Sizing Calculator ©1967 Made in USA by Perrygraf for ITT Controls. Slide Rule Scales: K, A [ B, C ] D, L Belonged to Robert N. Curry Collection. Robert authored the book "Fundamentals of Natural Gas Conditioning" |
 Daniel Air Gas Oriffice Flow Calculator |
Daniel Air Gas Oriffice Flow Calculator ©1967 Made in USA by Perrygraf for ITT Controls. Slide Rule Scales: [ C ] D Belonged to Robert N. Curry Collection. |
 Perrygraph Daytron Systems Antenna Gain 1993 |
Perrygraph Daytron Systems Antenna Gain ©1993 Made in USA by Perrygraf for Daytron Systems. Slide Rule Logarithmic Scales. Gift Of Gregor Playle. |
 Copyright 1939  1941 Advertisement |
Max B.A. Doring, of Brooklyn, and Samuel Lees, of New York, copyrighted the Plus and Minus slide rule in 1939 Sum-Up Slide Rule Co Ad in Radio Magazine, December 1941: SUM-UP SLIDE RULE - The new Sum -Up Plus and Minus Slide Rule is an aid to making and checking calculations for mechanical drawings, laying out machine - shop jobs, making patterns, etc. Unlike the usual slide rule which multiplies and divides, this rule adds, subtracts, and converts decimals of an inch, fractions of an inch, and millimeters interchangeably, and the answer can be read in fractions, decimals, and millimeters. It is made by the Sum-Up Slide Rule Company, 114 Liberty Street, New York |
 Plus And Minus Slide Rule 1939 (wood) 20.05.15.01 |
Plus And Minus Slide Rule - c1939 (wood) Made in USA by Plus And Minus Slide Rule Corp. Designed by Max B.A. Doring and Samuael Lees Note: wood stock has same dimensions as Lawrence Engineering. The cursors are interchangeable. Front Scale: A (0-1in)1/64 [ B (1-0in) 1/64, C (1 - 0.000in) decimal ] D (0-25.4mm). Back: Blank Gifted by anonymous donor. |
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 Plus And Minus Slide Rule 1941 (slidechart) REF |
Plus And Minus Slide Rule - c1941 (slidechart) Made in USA, by Sum-Up Co. Designed by Max B.A. Doring and Samuael Lees copyright 1939 Note: wood Front Scale: A, B [ C, D ] E, F, G Back: Instructions Archive photo, eBay
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| Founded by Arthur Frederick Eckel - United States. Inventor and manufacturer. Originally of Chicago. Cofounded R.C.Pickett & A.F. Eckel Company in 1943 with Ross C.Pickett to make aluminum slide rules. while residing in Evanston, Illinois. He left the company in 1948, which was then renamed P&E. A 1949 U.S. patent #2466983 was issued to A.F. Eckel with Louise Pickett being the assignee. Has several other United States patents (US #2615630) and his wife Myrtle Elizabeth (Scott) Eckel is shown as the attorney. Eckel later formed Precision Scale Company located in Phoenix, Arizona, producing all-metal slide rules to limited markets. George Washington University in Washington D.C. shows an A.F. Eckel as having graduated there in 1922. His estate sale in Phoenix produced several unfinished slide rules. |
 Precision Scale Co Model 1751 Log Log 10 Hyperbolic REF Got one to donate to the archives? |
Precision Scale Co Model 1751 Log Log 10 - c1950 Made in USA by Precision Scale Co founded by Art Eckel Note: Like Picketts, the stocks were printed in white and yellow. \ Front Scale: K, L DIF DF [ CF CIF √ Odd, √ Even, CI, C ] D DI, TH, SH1, SH2 Back scale: LL1, LL2, LL3 A [ B, S, ST, T, CI, D ] LL/1, LL/2, LL/3, LL/4 Archive - Scan by Marc-Yvon_Comeau Collection. Montreal, Quebec, Canada. |
 Precision Scale Co Model 1752 Log Log e Hyperbolic REF Got one to donate to the archives? |
Precision Scale Co Model 1752 Log Log e Hyperbolic - c1950 Made in USA founded by Art Eckel Front Scale: SH1, SH2, TH, A [ B, T Cot, ST, S Cos, CI, C ] D, DI, K, L Back scale:, LL/0, LL/1, LL/2, LL/3 DF [ CF, CIF, √ ODD, √ EVEN CI, C ] D, LL3, LL2, LL1, LL0 Photo provided by Marc-Yvon Comeau Montreal, Quebec, Canada. |
 USAF Type A-1 Aerial Photo ISRM 04.09.30.01 |
USAF Type A-1 Aerial Photo - c1950 Made in USA for Astrodyne by Precision Scale Co. (founded by Art Eckel) Front Scale: L, A, DF [ CF, CIF, T, S, C ] D, DI, K Back Scale: Ground Size, Ground Speed, [Image size, Cycling Time, Focal Length ] Altitude
USAF Manual 8.69Mb |
 P188 Prestige Precision - North American Engines |
Prestige Precision - North American Engines Made in USA for N.A. Engines, Philadelphia, PD. Front Scale: K, A [ B, CI, C ] D, L Back Adv: North American Engines Co. Inc. |
Sandia Corporation, Albuquerque, New Mexico.
Sandia Cumulative Binomial Distribution Computer (1963) ISRM 14.07.02.97 |
Sandia Cumulative Binomial Distribution Computer (1963) Designed my J.O.Muench of the Sandia Reliability Department. Front Scale: Monograph, c (# of units or events) [ n (# of Observations) ] p (Fraction of population with characteristic) Back Slide: Monograph, c (# of units or events) [ n (# of Observations) ] p (Fraction of population with characteristic) Gift of Ed Millis, Dallas, Texas 
Manual 172MB PDF
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The following excerpt is courtesy of Wikipedia.org:
"Things of Science was an educational program launched by the nonprofit news syndicate Science Service in November 1940. The program consisted of a series of kits available by subscription and sent by mail monthly. The program continued until 1989.Each month, thousands of subscribers received a small blue box about the size of a videocasette containing some material such as nylon thread or dinosaur bones. The box contained a yellow booklet explaining the topic for that month, along with the pieces and supplies needed to cover the topic. Some kits would teach about a specific topic, such as coal or optical illusions. Other kits would provide parts to build items such as a small spectrograph, telescope, or pinhole camera. In addition to the monthly subscription, some kits were available for individual purchase, such as a "soilless gardening" unit which provided seeds, plant food, and instructions in hydroponics. The Things of Science Club was started by Watson Davis, editor-in-chief of Science Service, because editors served by the service often asked for samples of the things the syndicate wrote about. The initial focus of the program was newspaper editors, but it soon shifted to young people. By 1946 the Science Service estimated that half of its subscribers were school groups and science clubs, and the other half were individuals.[5] Membership in the club was limited to a few thousand because some of the "things", such as dinosaur bones, were hard to come by." There were three slide rule computational units. Unite 123 in 1958, Unit 209 in 1958, and Unit 272 in 1963. These used off-the shelf slide rules. There was a unit offerred in See more at Rediscovering Things of Science website by George B. Moody.
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Things Of Science Computation Unit 273 ISRM 14.04.21.01 |
Science Services Things Of Science Computation Unit 273 Slide Rule Slide Rule made in USA by Engineering Instruments Front Scale: A [ B, CI, C ] D, K Back Slide: Blank Back: Blank  Mailer
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Slide Rule & Scale Engineering CO. Inc - A US slide rule
manufacturer was founded by George L. Lockhart in Laporte, Indiana in 1930,
and later New Carlisle, Indiana. SR&SE made custom slide wood slide rules,
such as the Concrete Quantity Calculator, as well as a standard Mannheim with
A-B-C-D-K & L scales. Rules were manufactured using magnolia
wood, finished white with an Ethyl-Cellulose base, then printed. A
transparent lacquer coating was then applied to protect the printing. In 1945 a
facility was built in Mt. Olive, Illinois. On February 14, 1947 the biggest fire in
Mt. Olive history destroyed part of the factory. Production resumed
in remaining buildings. On April 14, 1950 the company was declared bankrupt.
Nicholas Muschong, a Vice president of Acu-rule, filed to do business in
Illinois, and may have acquired the assets and copyrights. Similar in design and
construction to Lawrence Engineering Services and Festus (Later Acu-Rule)
Manufacturing. Other calculator models advertised in a 1940 flyer were Concrete
Block and Mortar, Brick and Hollow Tile, Lumber, and Galvanized Sheet Steel
Weight.
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 SR&SE Co - Lee's Ammortizer Slide Rule 17.5in ISRM 22.07.06.08 
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SR&SE - Lee's Ammortizer Slide Rule 17.5in - 1947 Made in USA by SR&SE Co, Mt. Olive, IL, Designed by George L. Lockhart Front Scale: Monthly Payment [ Annual Interest Rate (4% to 6-1/2%), Minimum months of loan ] Amount to be paid Back of slide : [ Annual Interest Rate (6.6% to 8-1/2%), Minimum months of loan ] Gift Of Cindy Tate of Bozeman, Montana 
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 SR&SE Co - Concrete Quantity Calculator REF |
SR&SE - Concrete Quantity Calculator - 1940 Made in USA by SR&SE Co, Mt. Olive, IL, Designed by George L. Lockhart Front Scale (extended) Thickness [ Width, Length ] Cubic Yards Back: Instructions |
 SR&SE Co - Concrete Quantity Calculator REF S556 Full Size Flyer 7.77MB
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SR&SE - Concrete Quantity Calculator - 1940 Made in USA by Slide Rule & Scale Engineering Co., Laporte, IN Front Scale (extended) Thickness [ Width, Length ] Cubic Yards Back: Instructions back Adv: The Master Builders Company, Chicago, Illinois  Instructions 562KB
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 SR&SE Co - Concrete Quantity Calculator (1947) ISRM 22.07.06.11 |
SR&SE - Concrete Quantity Calculator - 1947 Made in USA by Slide Rule & Scale Engineering Co., Laporte, IN. Copyright G.L. Lockhart. Front Scale (extended) A(Thickness) [ B(Width or Height), C(Length) ] D(Cubic Yards) Back: Instructions back Adv: Carlsbad Transit Mix Cement Co. In. Carlsbad, New Mexico. |
 SR&SE Co - Concrete Quantity Calculator REF |
SR&SE - Concrete Quantity Calculator - c1944 Made in USA by Slide Rule & Scale Engineering Co., New Carlisle, IN Front Scale (extended) Thickness [ Width, Length ] Cubic Yards Back: Instructions back Adv: Consumers Company, Chicago, Illinois  Instructions
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 SR&SE Co - Brick And Tile Computing Slide Rule REF |
SR&SE - Brick And Tile Computing Slide Rule - copyright 1940 Made in USA by Slide Rule & Scale Engineering Co., New Carlisle, IN for W.H.Pipkorn. Front Scale (extended) A Sale (Units to Sq In.) [ B Scale (Height in Ft.), C Scale (Length in Ft.) ] D Scale (Total Number of Units) Back: Reference Dimensions of Materials Adv: W.H. Pipkorn Company, W. Bruce Street, Southern End of 16th Street Viaduct, Milwaukee, Wisconsin Scan donated by David Rance, The Netherlands  Instructions
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 Photos of Gilbert and Christine Small Gilbert Small (1885-1963) invented and manufactured The Small Calculator in 1917. Jonathan Small, his Grandson, writes: "The only tidbit I know about the Pocket Calculator is that my grandmother mentions in her diaries from the 1920s a number of occasions when she and my grandfather would spend an evening assembling calculators to fill orders. Gilbert Small was employed by an engineering firm by the name of Worcester with offices in Waltham and Boston." (Continued on right) | (Cont'd) "He was frequently required to make trips to Portland, ME, to inspect a bridge there (a bridge known as the 'Million Dollar Bridge', which has since been torn down). As a small child I knew my grandfather had invented the 'Small Pocket Calculator' because he had quite a few in stock in his home in Wayland, Massachusetts. His work was in the field of architecture for which he regularly commuted from Wayland (a suburb) to Boston by train. He was instrumental in designing the colonial style home (also in Wayland) where my parents brought up their family and lived well into their senior years, Sometimes my grandfather's work involved dismantling old historical New England homes. When this was the case he frequently salvaged and recycled useful building materials. In the case of my childhood home, this included massive exposed hand hewn beams in the living room. You could see the marks where someone had shaped the beams one axe blow after another. He also recuperated broad planks of red pine paneling and vintage bricks for that house. His architectural work prompted him to invent the 'Small Pocket Calculator'. He designed it in an era before wristwatches had come into vogue and it was common for men to carry a pocket watch. My grandfather wanted to make a calculator that would have the same small, round and convenient size and shape." |
  The Small Calculator (1917) ISRM 14.06.12.01 |
The Small Calculator Made in USA by Gilbert Small, Waltham, Massachusetts United Staes Patents 657,916 Sep 18, 1900 and 1,255,939, Feb 12, 1918 Radial Scale: ( C, D ) Circular Scale Face 1: 6in Linear scale, CI, S Circular Scale Face 2: L, A (2 concentric scales), ST Gift Of Gretchen S. Lebrun (Canada) and Jonathan Small, Grand Children Of Gilbert Small Related US patents: (Additional Photos courtesy of Nathan Zeldes\, Israel) 
 US0657916
 US1255939
Scale Description |
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Spirule is the invention of the late Walter Richard Evans (1920-1999), who was a noted American control theorist and the inventor of the root locus method in 1948. He received his B.E. in Electrical Engineering from Washington University in St. Louis in 1941 and his M.E. in Electrical Engineering from the University of California, Los Angeles in 1951. Evans worked as an engineer at several companies, including General Electric, Rockwell International, and Ford Aeronautic Company. He was the recipient of the 1987 American Society of Mechanical Engineers Rufus Oldenburger Medal and the 1988 AACC's Richard E. Bellman Control Heritage Award electrical engineer who developed the "Root-Locus Method" for designing automatic control systems. He then invented the Spirule to help "nail down specific points on the locus - to establish the gain to use and the exact natural frequency and damping that will result". This device was manufactured by Evans's company in the 60's, and 100,000 of them were actually shipped before personal computers took over. He wrote "Control System Dynamics" 1954, published by McGraw Hill,
1954 In Memoriam, Orbit Magazine, 2000 |
 The Spirule (1959) ISRM 19.06.18.02 
 1959 Instructions (97MB PDF) |
The Spirule (copyright 1951) Made in USA by The Spirule Co. ,Whittier, California. for North American Aviation Construction: clear sheet plastic, and consists of a disc that can rotate on a pivot on a 30 cm long rectangular ruler. Both pieces are covered with graphs, scales and other markings. This version has a guide on a pivot. The Spirule was flat enough to ship in a mailing envelope with the instructions. Circular disk: ( Slope, damping Ratio, Log, C scale ) Rectangular scales on face (D scale), S/2, 1/S, S, R, P, M, A-, A+ Scales on edges: 0-1.8 linear, 0-90 linear, 1-10 Logarithmic Gift of Shirley Brooks of Jacksonvill, FL, Peter's widow. Original Owner: Peter Brooks Morton (c.1938-2017). Peter graduated from the University of Akron with a BSEE in Electric Engineering, Medical Electronics. He received his Masters in Electrical Engineering, Computer Science from Polytechnic Institute of New York. He was Assistant Professor, Engineering Director of Rockland Community College from 1964-1984. and was Adjunct Professor at SUNY College at New Paltz, Mathematics and Computer Science Department 1984-1985. He also was Adjunct Professor at FIT's Manufacturing Management, Science/Math Dept. He retired in October 2006 from the Fashion Institute of Technology where from 1985 to June 2006 he worked as the Micro Computer System Specialist and late as Campuswide Network Manager. Hee had his own business, Dearniac Computer Services. He published several books including "Electronic Technicians Handbook: Power Supplies; Batteries" Theory & Problems in Electrical Technology, Schaum's College Outlines"; Technical and Instructional Manuals, E-Com Corporation. |
 The Spirule (1959) ISRM 19.06.18.02 
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The Spirule (1959) Made in USA by The Spirule Co., Whittier, California. for North American Aviation Construction: clear sheet plastic, and consists of a disc that can rotate on a pivot on a 30 cm long rectangular ruler. Both pieces are covered with graphs, scales and other markings. This version has a guide on a pivot. The Spirule was flat enough to ship in a mailing envelope with the instructions. Circular disk: ( Slope, damping Ratio, Log, C scale ) Rectangular scales on face (D scale), S/2, 1/S, S, R, P, M, A-, A+ Scales on edges: 0-1.8 linear, 0-90 linear, 1-10 Logarithmic Archive - Nathan Zeldes Collection, History of Computing |
 The Spirule (c1965) ISRM 19.02.21.08 
 1965 Instructions |
The Spirule ( copyright 1951, 1965 version) Made in USA by The Spirule Co. ,Whittier, California. for North American Aviation Construction: clear sheet plastic, and consists of a disc that can rotate on a pivot on a 30 cm long rectangular ruler. Both pieces are covered with graphs, scales and other markings. This version has a guide on a pivot. The Spirule was flat enough to ship in a mailing envelope with the instructions. Circular disk: ( Slope, damping Ratio, Log, C scale ) Rectangular scales on face (D scale), S/2, 1/S, S, R, P, M, A-, A+ Scales on edges: 0-1.8 linear, 0-90 linear, 1-10 Logarithmic Gift of Gregory and Joy Playle, of Alexandria,Virginia In this version: Plastic strip (Page 9, Item 1) no longer included to save costs, since it was seldom used. |
 TandT Electric FAST Calculator ISRM 17.09.14.01 |
TandT Electric FAST Calculator Made in USA - Copyright 1938, Metal construction Note: Address on manual: 975 So. Raymond Avenue, Pasadena 2, California 3 external disks, 1 internal disk Designed by Frank A. Short, Los Angeles, California. Frank who was working at the Riverside Muninciple Plant, was Initiated into the Los Angeles Jovians in 1914. He was listed as living in South Pasadena, California. In 1944 he was part of the Industrial Accident Commission in Los Angeles. Front Scale Wire Calculator: (wire size), % drop, Feet one way, (Amperes), System Index, Wire capacity table Back Scales 220V Motors: (Slip-Ring, High Reactance, Squirell Cage), Horse-power, Conduit, Fuse, Load, Wire Back Scales 440V Motors: (Slip-Ring, High Reactance, Squirell Cage), Horse-power,Conduit, Fuse, Load, Wire Gift of Michelle Black of Morro Bay, California. Belonged to father, John Black. 
 Instructions (0.35MB PDF)
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 TandT Electric FAST Calculator - Version 2 REF |
TandT Electric FAST Calculator - Version 2 Made in USA - Copyright 1938, Metal construction Note: Address on front: 933 S. Fair Oaks Avenue, Pasadena, California Added reference on calculator: "Motor data based on the National Electrical Code - 1937" 3 external disks, 1 internal disk Designed by Frank A. Short, Los Angeles, California. Frank who was working at the Riverside Muninciple Plant, was Initiated into the Los Angeles Jovians in 1914. He was listed as living in South Pasadena, California. In 1944 he was part of the Industrial Accident Commission in Los Angeles. Front Scale Wire Calculator: (wire size), % drop, Feet one way, (Amperes), System Index, Wire capacity table Back Scales 220V Motors: (Slip-Ring, High Reactance, Squirell Cage), Horse-power, Conduit, Fuse, Load, Wire Back Scales 440V Motors: (Slip-Ring, High Reactance, Squirell Cage), Horse-power,Conduit, Fuse, Load, Wire Archive - Courtesy of Sphere Reasearch. 
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 T & T Fast Calculator ISRM 09.10.21.09 |
T & T Fast Calculator Made in USA - 5-5/8" x 7" Front Scale - Wire Calculator: Wire Size (Amperes) System Index Back Scale - Motor Calculator: Load (Fuse Sizes) Donated by Marten C. Jensen  Instructions
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 REF Henry W. Tomlinson Winslow Strength Computing |
Henry W. Tomlinson Winslow Strength Computing Made in USA - Copyright 1904 Metal construction Designed by Benjamin E. Winslow, Structural Engineer Front Scale (Wood Beams): A1, A2 [ A3, A4 ][ A5, A6 ] A7, A8 B1, B2 [ B3 B4 ][ B5, B6 ] B7, B8 Back Scale (Steel Beams): C8, C'7, C7 [C6, C5 ][ C4, C3 ] C2, C1 D8, D'7, D7 [D6, D5 ][ D4, D3 ] D2, D1 Archive - SR and Instructions scans provided by Peter Fox, UK  Instructions (1.81MB PDF)
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 REF Henry W. Tomlinson Winslow Strength Computing |
Henry W. Tomlinson Winslow Strength Computing Made in USA - Copyright 1931 Fiberboard construction Designed by Benjamin E. Winslow, Structural Engineer Front Scale (Wood Beams): A1, A2 [ A3, A4 ][ A5, A6 ] A7, A8 B1, B2 [ B3 B4 ][ B5, B6 ] B7, B8 Back Scale (Steel Beams): C8, C'7, C7 [C6, C5 ][ C4, C3 ] C2, C1 D8, D'7, D7 [D6, D5 ][ D4, D3 ] D2, D1 Arcvhive - Scan provided by Peter Fox |
 S156 Tru-Bilt 79CB |
Tru-Bilt 79CB Made in USA - retail package Front Scale: S, K, A [ B, CI, C ] D, L, T Back blank |
 S309 U.S. Blue 1876 |
US Blue 1876 Made in Japan by Hemmi for U.S. Blue Co., Chicago Front Scale: A [ B, C ] D Back Scale: [ S, L, T ]  |
 Wallace Barnes Spring Data Computer - 1943 ISRM 13.00.00.74 |
Wallace Barnes Spring Data Computer - 1943 Made in USA - Division of Associated Spring Corp (ASC) - Original design(c)1943 Note: The Pickett 1025 and 1100 replaced these Slide Charts after WWII Front Scale: Pounds/inch Deflection [ Number of Coils, G Torsional Modulas, ■ Mean Diameter ] Wire Diameter Back Scale: Fiber Stress (PSI) [ Load (lbs) ] Mean Diameter [ Size in inches, ■ ● ] Mean Diameter |
 Wallace Barnes Spring Data Computer - 1952 ISRM 13.00.00.75 |
Wallace Barnes Spring Data Computer - 1952 Made in USA - by J.B. Carroll, Chicago. Wallace Baranes is a division of ASC Note: The Pickett 1025 replaced these Slide Charts after WWII \ Front Scale: Fiber Stress (PSI) [ Load (lbs), ■, Wire Diameter ] Mean Diameter Back Scale: Rate P/F (pounds per inch) [ Active Coils, ■ G (Torsional Modulas) ] Wire Diameter (inches) Original owner: Marc Slabins (written on slide) |
F. Weber & Co., Philadelphia, Pennsylvania.
 1923 Logo. 1920 Factory and Catalog. Slide rules begin on page 235. | A successor company to Janentzky & Weber Manufacturers & Importers, F. Weber Co.was founded by the artist and businessman, Frederick W. Weber, Sr. (?-1919) in 1854, F. Weber Co. is the oldest and one of the largest manufacturers of art materials in the United States. The factory at 1220 Buttonwood St in Philadelphia, Pennsylvania manufactured artist paints and drawing materials. They also sold rebranded drawing instruments for draftsmen and engineers and slide rules (mostly from German and USA makers), along with school supplies. Following the death of Fredrick W. Weber Sr. in 1919, his two sons Fred William Weber, Jr. (1935-2003) and Ernest Weber had the company incorporated and renamed it F. Weber Co., Inc. Fred W. Weber served as Technical Director and was a successful artist, chemist, inventor, and businessman, he was responsible for much of the innovation in product development after taking over in 1919 to his retirement in 1967. The company was bought by Visual Art Industries of Brooklyn, NY in 1980, after the slide rule era. The modern company, Martin F. Weber Co. is also known for its artists signature kits designed for revered television artists such as Jon Gnagy, Bob Ross, Susan Schewe, Robert Wyland and Bruce Blitz.Reference: Wickipedia |
 REF Weber No. 5 Special REF |
Weber No. 5 Special Made in USA - Philadelphia Front Scale: A [ B, CI, C ] D Archive - Herman van Herwijnen Slide Rule Catalogue |
 Weber 4237 Mannheim ISRM 20.04.01.358 |
Weber 4237 Mannheim (4 in) Made in Germany by Nestler for F.Weber Front Scale: A [ B, C ] D Back Scale: 11.5cm [ S, L, T ] 4.5in Gift of Philip Stanley Collection |
 Weber 4280-A S568 |
Weber 4280-A - c1930 Made in USA - Same as Post 1457, Charvoz-Roos 109 Material: Wood stock with plastic laminate, plastic braces Front Scale T Cot, DF [ CF, CIF, CI, C ] D, S Cos, ST Back Scale: Fraction-Decimal [ B, K, L, C ] Trig identities Original Owner: E. Ewan, 1472 S0. 303 rd., Auburn, WA (on case) |
 Weber 4280-M_Mannheim-Trig 1945 ISRM 20.08.04.01 |
Weber 4280-M_Mannheim-Trig - 1945 Made in USA by Acurule - Same as Post 1457, Charvoz-Roos 109 Material: Wood stock with plastic laminate. Metal braces Front Scale T Cot, DF [ CF, CIF, CI, C ] D, S Cos, ST Back Scale: Fraction-Decimal [ B, K, L, C ] Trig identities Note: Came with unbranded Acurule manual by Ross R. Middlemis 
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 Weber 4281-S Students Slide Rule S158 |
Weber 4281-S - Students Slide Rule - c1930 Made in USA - Philadelphia Front Scale A [ B, C ] D, (Q+1, P+1 notation) Back Scale: [S, L, T ] |
 Weber 4281-5 Mannheim Slide Rule ISRM 20.08.06.01 |
Weber 4281-5 - Mannheim Slide Rule - c1935 Made in USA by F,Weber Co. St.Louis, Philadelphia, Baltimore Front Scale: A [ B, C ] D Back Scale: [S, L, T ] Back: Equivvalents Table 
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 Weber 4285-A 20.08.17.01 |
Weber 4285-A Made in USA by Roos for F.Weber Same as Roos Co. SR-104 Front Scale: A [ B, CI, C ] D, K Back Scale: [S, L, T ] Sterling 587 cursor 
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 Weber 4285-N (Rietz) ISRM 20.08.16.01 |
Weber 4285-N (Rietz) Made in Germany by Nestler for F.Weber Front Scale: K, A [ B, CI, C ] D, L Back Scale: 29.5cm [S, S&T, T ] 11-5/8 inch Multiple Hairlind Cursor |
 Weber 4285P Scola REF |
Weber 4285P Scola Made in USA by Acu-Rule for F.Weber Front Scale: S, K, A [ B, CI, C ] D, L, T Back Scale: Equivalents and Conversions Archive - Tom Dilatush Collection |
 Weber 4286 Pocket Mannheim with Magnifier Pre-WWII ISRM 20.04.01.233 |
Weber 4286 Pocket Mannheim with Magnifier pre-WWII Made in Germany by Nestler for F.Weber Front Scale: 5in // A [ B, C ] D || 15cm Back Scale: [ S, L, T ] Back Scale: Equivalents and Conversions (UK English) Gift of Philip Stanley Collection |
 Weber 4286-D Pocket (Diwa-Denmark) ISRM 22.02.12.01 |
Weber 4286-D Made in Denmark by Diwa for F.Weber Front Scale: 5in // K, A [ B, CI, C ] D, L Back Scale: [ S, S&T, T ] |
 Weber 4286P Pocket Mannheim (1954) ISRM 20.04.01.134 |
Weber 4286P Pocket Mannheim dc G5402 (Feb 1954) Made in Germany (Western Zone) by Aristo for F.Weber Front Scale: 5in // A [ B, CI, C ] D, L Back Scale: [ S, L, T ] 13cm Back Scale: Equivalents and Conversions (UK English) Gift of Philip Stanley Collection |
 Weber 4287 Pocket REF |
Weber 4287 Pocket Made in Germany by A. Nestler for F.Weber Front Scale: A [ B, C ] D Back scale: 11cm [S, S&T, T ] 4.5in Archive - Scan provided by Mark D. Sutton |
 Weber 4287 Pocket Mannheim (post WWII) ISRM 20.04.01.243 |
Weber 4287 Pocket Mannheim (post WWII) Made in Germany (Aristo or Nestler?) for F.Weber Thin film cursor Front Scale: 5in // A [ B, CI, C ] D, L Back Scale: [ S, L, T ] 13cm Gift of Philip Stanley Collection |
 Weber 4288 Pickworth (Rietz) ISRM 21.01.19.01 |
Weber 4288 Pickworth (Rietz) Made in Germany by A. Nestler for F.Weber (similar to Nestler 23R),. Riveted laminations. Front Scale (extended) 10in // K, A [ B, CI, C ] D, L || 27.5 (Q+1, P-1) Back scale: [S, S&T, T ] Well: blank Back: Equivalents (English), Slide Rule Data Slips, complied by. C.N.Pickworth, Wh.Sc. Multi-lined Cursor 
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 Weber 4288 Rietz S417 |
Weber 4288 Rietz Made in Germany by A. Nestler for Weber (similar to Nestler 23R) Front Scale (extended) 11in // K, A [ B, CI, C ] D, L || 1:25 Back scale: [S, S&T, T ] Well: 55cm Back: Equivalents (English), Albert Nestler Multi-lined Cursor 
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 Weber 4293 REF |
Weber 4293 Made in USA by Charvos-Roos (or Acu-Rule) - c1945 Front Scale: LL0, LL00, A [ B, K, CI, C ] S Cos, ST, T Cot, Back Scale: L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2 Archive - Tom Dilatush Collection |
 Weber 42121 N P229 |
Weber 42121 N Made in Germany by A. Nestler for Weber (similar to Nestler 021) Front Scale (extended) 5in // P, K, A [ B, CI, C ] D, S, T Back Scale: [ LL1, LL2, LL3 ] Multi-lined cursor |
 Weber 42968 (Aristo Studio 968) REF |
Weber 42968 (Aristo Studio 968 Version 1) c1960 Made in Germany by Aristo for Weber Co. Philadelphia, Pennsylvania. Front Scale; (extended) LL01, LL02, LL03, A [ B, L, K, C ] D, LL3, LL2, LL1 Back Scale: T Cot, ST ST, DF [ CF, CIF, CI, C ] D, P, S Cos Multiple hairlines: PS, KW Archive - Stephen Wilde Colllection 
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 Whitehead & Hoag Company (W&H), founded in 1892, made over 5,000 different advertising novelty item, mostly famous for buttons.
During World War II, normal button production was shelved for a period of time at the factory. W&H then turned to the identification buttons which were worn by millions of workers in the war plants. At the peak of the war, W&H had over 400 employees making these buttons which were required to be worn by state and federal laws. Bastian Bros., of Rochester N.Y. (founded in 1895) was a long-time competitor of W&H and purchased W&H in 1959, and the factory was closed, scrapping all the tools and dies. Bastian continued to use W&H's name, finally phasing it out in 1964-65.When determining if a thin film sheet plastic slide rule is made by Graphic Calculator, Gerson, Parisian Novelty, Whitehead-Hoag (W&H), etc, look for the cursor stop that prevents the cursor from falling off. This was a W&H feature. However the C-Thru No. 27 and 88 also had this feature. W&H predates C-Thru, so thru may have purchased the W&H toolinjg from Bastion Bros. |
 Whitehead-Hoag Cox's Stadia Computer circular slide rule cWWII ISRM 22.07.06.61. |
Whitehead-Hoag Cox's Stadia Computer circular slide rule cWWII Made in USA by Whitehead-Hoag, Newark, New Jersey for W. & L.E. Gurley Manufactured and printed from thin plastic sheet. Dimensions: 6 x 6 inches Square. Front Scale: Rod Reading ( Difference of Elevation, Horizontal Distance ) Back advertosement: W. & L.E. Gurley, N.Y. Theodilite and Transits. [ Temp Conversion table ] Original owner: Capt. H.A. Shutes, 105 1st Engineer. Gift of Cindy Tate, Victor B. Tate Collection, Bozeman, Montana. The Gurley enterprise was established in 1845, first as the partnership of Phelps & Gurley and in 1852 as W. & L. E. Gurley. William Gurley and his younger brother Lewis E. were both engineering alumni of Rensselaer Polytechnic Institute, in Troy, NY.It was sold to Teledyne in 1968. |
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 Whitehead & Hoag (Heliopot) Pocket Slide Rule ISRM 14.07.02.90 |
Whitehead & Hoag (Heliopot) Pocket Slide Rule Made in USA by Whitehead-Hoag, Newark, New Jersey Manufactured and printed from thin plastic film. These are similar, in design, to slide rules branded by C-Thru, however the W&H design uses cursor stops. Dimensions: 6-1/2 x 1-1/4 inches Front Scale: A [ B, CI, C ] D Back Scale: [ Temp Conversion table ] Gift of Ed Millis, Dallas, Texas |
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ISRM 12.09.26.59 |
Whitehead & Hoag Generic Slide Rule Version 1 Made in USA by Whitehead & Hoag Newark, New Jersey Front Scale: A [6in, B, CI, C, 15.3cm] D Well: Equivalents Back Slide (Fil over to use): [S, L, T ] Donated by the Huang Collection |
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 Whitehead - Hoag Machine Drilling Speeds and Feeds ISRM 20.04.10.407 |
Whitehead - Hoag Machine Drilling Speeds and Feeds Made in USA by Whitehead & Hoag Newark, New Jersey Front Scale: RPM od Spindle, Drill Diameter (size) [ Feed in Thous per Rev. Surface cutting Speed, Depth of Hole in Inches ] Time Required in Seconds Well: Equivalents Back Slide: Blank Well: table of Drill Sizes (select through window) Gift of Philip Stanley Collection |
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 General Electric Cable Calculator P152 |
General Electric Cable Calculator Made in USA Front Scale: A, [ B, C ] D, E Back Scale: Wire Current Capacities Back adv: Wire Gage Working Table |
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 Whitehead & Hoag Generic Slide Rule Version 2 ISRM 12.09.26.60 |
Whitehead & Hoag Generic Slide Rule Version 2 Made in USA by Whitehead & Hoag, Newark, NJ. for AMECO Community Television Systems Front Scale: A [6in, B, CI, C, 15.3cm] D Well: Equivalents Back: Conversions: dB to microVolts, TV Channel to Frequency (megacycles) Back adv: AMECO, Phoenix, Arizona (Community Television Systems) Donated by the Huang Collection The collector, who prefers to remain anonymous, obtained a B.S. degree in Physics from Taiwan's National Tsing Hua University in 1971. His love for computation has encouraged him to build a collection of slide rules, HP and TI calculators, as well as abaci, many displayed at ISRM. |
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 Aeronav Inst. Private Pilots Flight Computer Model-I ISRM 14.07.02.29 |
Aeronav Instruments Private Pilots Flight Computer Model-I Made in the United States, in New York by Whitehead & Hoag, Newark, New Jersey Front Scale: True Air Speed [ Indicated Air Speed, Pressure Altitude ] Air Temp ( Distance, Time Min, Hrs) Back Scale: Sectional Chart Scale, Ground Speed (Wind Correction Angle, Drift, True Heading ) Gift of Ed Millis, Dallas, Texas. |
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 Whitehead-Hoag Wagner Net Price Calculator MIT 2004.010.0171 |
Whitehead-Hoag Wagner Net Price Calculator Made in USA by Whitehead & Hoag Newark, New Jersey Front Scale: List price (%, Net Price) Back: Instructions on combining discounts back Promo: Wagner Electric Manufacturing Co., St. Louis, MO. Archive - MIT Collection |
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 Whitehead-Hoag Simplex Wiring Computer 1905 MIT 2004.010.0169 |
Whitehead-Hoag Simplex Wiring Computer 1905 Made in USA by Whitehead & Hoag Newark, New Jersey Front Scale: List price (%, Net Price) Back: Instructions on combining discounts back Promo: The Simplex Electrical Co., 201 Devonshire St. Boston, Mass. Archive - MIT Collection | ||
 Whitehead-Hoag Journal Low Pressure Gas Flow Computer ISRM 18.03.20.10 |
Whitehead-Hoag Journal Low Pressure Gas Flow Computer 1935 Made in USA by Whitehead & Hoag Newark, New Jersey for American Gas Journal, Dallas Texas Note: This is a 7" x 8" blue hardbound folder with instructions on the left and a pocket on the right. Front Scale: Cubic feet of Gas per Hour (Diameter of Pipe-inches) Section Scale: Belonged to Robert N. Curry. Gifted by his friend Alice Bowling of Louisville, Kentucky.
Robert N. Curry was a 1949 graduate of Western Kentucky University. Bob was the head of Measurement for Texas Gas Transmission Corp and authored a book on Natural Gas processing Fundementals of Natural Gas Conditioning. He was former chairman of the AGA Transmission Measurement Committee. Several of his slide rules are currently in the ISRM galleries. |
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 Whitehead-Hoag Journal High Pressure Gas Flow Computer ISRM 18.03.20.11 |
Whitehead-Hoag Journal High Pressure Gas Flow Computer 1935 Made in USA by Whitehead & Hoag Newark, New Jersey for American Gas Journal, Dallas Texas Note: This is a 7" x 8" red hardbound folder with instructions on the left and a pocket on the right. Front Scale: Cubic feet of Gas per Hour (Diameter of Pipe-inches) Section Scale: Belonged to Robert N. Curry. Gifted by his friend Alice Bowling of Louisville, Kentucky. |
 Honeywell Metric Conveter ISRM 12.04.25.03 |
Honeywell Metric Conveter Made in Italy (stamped on sleeve) Front Scale: PSI to KG/cm2. LBS to KG, FT3 to M3. BTU to K-CAL Inches to CM, Feet to Metres, US Gal to Litres, Farenheit to Centigrade Sleeve adv: Honeywell 'First in Control', Worldwide Donated By Zdenka Novosad, Louisville, Colorado Zdenka used this slide rule during her career as a petroleum engineer. She attended high school and graduated with a masters degree in Czechoslovakia. She received a PhD. from the University of Pennsylvania (1975) and later became a Petroleum Engineer for Shell Canada Limited and was a member of the Society of Petroleum Engineers. One of her many papers, published in 1996 by the journal 'SPE Reservoir Engineering', was Composition and Phase Changes in Testing and Producing Retrograde Gas Wells and she wrote Spectroscopic and Magnetic Resonance Studies of Aromatic Molecules published by the Graduate School of Arts and Sciences, University of Pennsylvania, 1975. |
 Atlas 51 REF P126 |
Atlas 51 Made in Japan Front Scale: A, [ B, CI, C ] D, K Back Scale: [ S, L, T ] Sleeve adv: Tower Const. Co. Sioux City, Iowa |
 Atlas-Copco Fluidics REF P067 |
Atlas-Copco Fluidics - Closed simplex Made in Sweden - Text in Spanish Front Scale: ΔP1, ΔP [ d, P, L ] Q, Q1 Back Scale: [d, P1, L1 ] Original owner: UNK/Peru |
 Dupa 012b General Electric REF P117 | Dupa 012b General Electric Made in Germany by Aristo Front Scale: F, A, [ B, CI, C ] D, E Back Scale: Blank Back adv: General Electric Original Owner: R.M. Hull |
 Fawick Airflex REF P187 | Fawick Airflex Made in Japan for U.S. Company Front Scale: A, [ B, CI, C ] D, K Back Scale: [ S, L, T ] Back adv: Fawick Airflex Industrial Clutches and Brakes |
 Johnston Bros REF P144 |
Johnston Bros - Simplex Made in USA - Probably by Sterling Front Scale: A [ B, CI, C ] D, K Back Adv: Johnston Bros, Ferrysburg, Michigan |
 RCA 551 Duplex ISRM 09.01.12.136 |
RCA 551 Duplex Made in Japan for RCA Front Scale: K, A [ B, S, T, C ] D, DI Back Scale: DF [ CF, CI, C ] D, L Donated by David Hecht, Alexandria, VA (ref 183) |
 RCA 551 Duplex - Cursor Variation REF P181 |
RCA 551 Duplex - Cursor Variation Made in Japan for RCA - Front Scale: K, A [ B, S, T, C ] D, DI Back Scale: DF [ CF, CI, C ] D, L Multiple hairline cursor |
 SKF [ Early Hemmi 74 Variant ] REF P166 |
SKF [ Early Hemmi 74 Variant ] Made in Japan by Hemmi for SKF Ball Bearings Front Scale (Extended) 14cm // K, A [ B, CI, C ] D, L Back Scale: [ S, S&T, T ] Back Adv: SKF |
 Swinston - Mesta REF P145 |
Swinston - Mesta Made in Germany for Swinston, Pittsburgh, PA, USA Front Scale [Extended] 5in // K, A [ B, C ] D Back Scale: Blank Back Adv: Mesta Machine Co., Pittsburgh, PA |
Wisconsin Manufacturers Assn 1959 Metal Trades Apprentice Exhibit ISRM 22.03.29.01 |
Wisconsin Manufacturers Assn 1959 Metal Trades Apprentice Exhibit Made in USA, Front Scale: [ C ] D Back Scale: Promo Back Adv: Wisconsin Manufacturers Assn and Wisconsin Industrial Commission |
Avol-Rule Instructions (3.21MB PDF)
Road Engineering Course FPE 342 Winter 1992, University Of Washington, 
Instructions 1.48MB
