Misc. United States of America

This gallery is dedicated to slide rules and manufacturers located within the U.S.A. that do not have their own gallery. You will note that many United States Companies OEM'd some of their slide rule models from other countries. This is not a practice employed by the other countries themselves (i.e. buying from the USA and put their name on them). It was probably less from national pride as it was a method of the United States in helping to rebuild European and Japanese economies after WWII and in some cases, like Post and Dietzgen, to renew their relationships as it was before the war.

Manufacturers/Brands Represented in this gallery:
AVOL Mfg. Co., Bellamy, Beta Enterprises, Bill-Mar, Brown, Charles Bruning, Climatemaker, C-Thru, Davis Instruments, Dieterich-Post, Digi-Craft, Disney, Easterly, Empire Educational Instruments Inc, EngineeringSales, Favor-Ruhl, Felsenthal, Foxboro, Fullerton, Gemini Engineering Gerber, Gibson-Spring, Gisholt, Globemaster, Graphic Calculator, Grizzle, B.F., GUCO, Guedon, Henschel, Indeco, Jones Metabolism Equip., Kahl Scientific, Kel-Co, Keyline, Kudlaty, Lakeside, Lietz, Master, Mead, Neal Feay, Nobema, D.Van Nostrand, Novotni, Science Services, Small, Spirule, Paisley, Parisian Novelty, Pedigree, Perrygraf SR, Plus & Minus, Precision Scale Co, Prestige, SR and SE CO, T and T Electric Mfg., Tomlinson, Tru-Bilt, USBlue, Wallace Barnes, Weber. and various promo slide rules at bottom of gallery.

More United States manufactured slide rules may be found in the Circular, Acu-Math, Charvoz-Roos, Dietzgen, Lawrence, K&E, Post, Pickett, Richardson, and Sterling galleries. Slide rules branded for USA companies by Relay/Ricoh may be found in that gallery, along with related USA made slide rules under their brands, Like ALVIN, Compass, Lafayette, Skyline, etc.

AVOL Mfg. Co., Portland, Oregon

Note: The ISRM Curator speculates that this computational device may have been designed in 1958 by a Univ. of Wash. grad student or professor with the last name of "Avol", as the only record of its use was taught by the University, as late as 1992, and was used within the state of Washington by the donor mentioned below. Although the rule is marked patent pending, there is no record of one being issued.

Avol-Rule for Earthworks Computation
ISRM 14.04.31.01

Mahagony Clam Shell box.

Avol-Rule Instructions (3.21MB PDF)

Road Engineering Course FPE 342 Winter 1992, University Of Washington, References the Avol-Rule in its text.

Avol-Rule for Earthworks Computation
Made in USA - By AVOL Mfg. Co., Portland, Oregon ©1958. Patent Pending Copyright entry: A484354 17SEP1958
Note: The Instructions show that this was sold by Tomar Instrument Co., 7511 N.W. 5th Ave, Vancouver, WA.
Front Scale : 10-3/8 in // Area, Volume (0-1000), Volume (1000-2000), Acres (0-25), Acres(25-49.5)
Back : Map Scale Factors
Used for earthwork calculations in road engineering to determine the volume of fill or in a cutaway.
Donated by Ruth Hazen, for her husband Philip Hazen, of Washington, D.C.

Philip Hazen purchased this in the 1960's when he was doing bridge work for the US Department of Transportation in Vancouver, WA Philip Hazen grew up in Northwestern Pennsylvania and graduated from Fort LeBeuf Academy in Waterford, PA in June, 1954. Four years later, he graduated from Penn State University with a Civil Engineering degree, and enlisted in the Navy. Following his tour with the Seabees, he was accepted into a three year training program with the Bureau of Public Roads (BPR) in Washington, DC. BPR sent him Mt. Rainier, WA in the summer of 1962, to Vancouver, WA in 1963, and to Wisconsin and Texas in 1964. In Vancouver in April, 1963, Mr. Hazen was assigned the task of preparing to cut and fill a roadbed. He used the Avol-Rule to calculate area and volume, so that the material cut from a hill would just match the area to be filled. He remembers this as a desk job done in preparation for surveying, as it was too early to get out in the field. Following his training period with BPR, he spent his career in the Bureau of Public Roads in Washington, DC, later renamed the Federal Highway Administration, retiring in 1994. Now retired, Philip devotes his time to travel, renovating old houses and to community service.

John C. Bellamy

Bellamy Temperature And Pressure Gradiant Scale
ISRM 20.10.01.04

Bellamy Temperature And Pressure Gradiant Scale
Made in USA - By Johnn C. Bellamy (1943) Institute of Meteorology University of Chicago
Front: Horizontal Temperature and Pressure Gradient Scale
Back: Instructions and Graph of C²/R

Beta Enterprises

Beta Enterprises ABA-TEN Rule
ISRM 13.00.00.66

Beta Enterprises ABA-TEN Rule
Made in USA - By Beta Enterprises, Salinas, CA (1971)
Front Scale : 12 in // [ a ] [ b ] \\ 30cm
Back Scale : C1 [ D ] C2
Used for addition/subtraction, as well as multiplication/division

Instructions 1.48MB

Bill-Mar Speciality Co., Ohio

A widely diversified company that produced specialty slide rules. The only two styles that are known are concrete volume calculators, but as there are models #24 (made in Japan) and #89 (made in Hong Kong), shown in the gallery, there must be other varieties as well.

Bill-Mar Sp. Co. Concrete Calculator No.24
ISRM 13.05.19.01

Bill-Mar Sp. Co. Concrete Calculator No.24
Made in Japan for Bill-Mar Speciality Co., Ohio (c1970)
Front Scale : A (Thickness) [ B (Width or Height), C (Length)] D (Cubic Yards), Dia Inches
Back : Instructions.
Back Advertising: El Paso Sand Products, Inc. (Colorado)
Donated by Jeremiah Whitney, Louisville, Colorado

Jeremiah Wadsworth Whitney (1941- ) used this slide rule in his career as an Architect.He graduated with a B.Arch degree from Yale University in 1963, and as part of the Officer Candidate School, he spent the next 5 years (1963-1968) as a commissioned officer, in the U.S. Naval Reserves, achieving the rank of Lieutenant, He received his MS.Architecture from Yale in 1971, then relocated to Colorado and specialized in residential design for developers. Photo taken by ISRM in 2013.

Bill-Mar Sp. Co. Concrete Calculator No.89
REF

Bill-Mar Sp. Co. Concrete Calculator No.89
Made in Hong Kong for Bill-Mar Speciality Co., Ohio (c1990)
Note: Similar in construction to low cost folded thin sheet slide rules made by C-Thru
Front Scale : A (Thickness) [ B (Width or Height), C (Length)] D (Cubic Yards), Dia Inches
Back : Instructions.
Back Advertising: SOUSA READY MIX, Mt. Shasta, California
Archive - Scan by Prof. Christian M. Hamann Collection, Germany

Arthur Brown & Bro

P210 Arthur Brown & Bro 7993A	Arthur Brown & Bro 7993A Made in USA (looks like by Bruning) Front Scale : 12.5cm // A [ B, CI, C ] D, K \\ 5in Back Scale : S, L, T Back: Blank
ISRM Arthur Brown & Bro 7996A	Arthur Brown & Bro 7996A Made in USA (by Roos) Material: Wood stock with plastic laminate Front Scale (Scale similar to Post 1457) T Cot, DF [ B, K, L, C ] D, S Cos, ST Back Scale Fraction-Decimal [ CF, CIF, CI, C ] Trig identities

Charles Bruning Company

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
REF

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
Archive - Image and manual (4.35MB PDF) courtesy of Greg Scott's Slide Rules

Charles Bruning 2401
ISRM 12.02.12.01

Charles Bruning 2401
Made in USA - Westinghouse Electric Promo
Note Frederick Post 1444P 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

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

Charles Bruning 2401
ISRM 13.07.03.06

Charles Bruning 2401 Simplex
Made in USA
Note alternate cusor design
Front Scale
12.5cm // A [ B, CI, C ] D, K \\ 5in
Back Scale: [S, L, T ]
Original Owner: Morris H. Friedman (etched on stock)
Donated by Daniel Swerdlow, Bethesda, Maryland

Charles Bruning 2401 (Newer Cursor)
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.

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 Box

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

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.

Radio Shack Ad. Features Charles Bruning 10inch Mannheim Slide Rule. $3.99 Radio-News, September 1955

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

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

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

Climatemaker Slide Rule Co., Box904, Bloomington, Illinos

also Climatemaker Heat Loss Calculator Co.

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

Climatemaker Heat Loss Calculating Rule - 1938
Made in USA by Climatemaker Corp.,
1804 WestEnd Ave, Nashville, Tennessee

C-Thru Ruler Company

The C-Thru Ruler Company was founded in 1939 in Bloomfield, Connecticut and specialized in transparent plastic rulers and templates. They designed a line of inexpensive (value-priced) folded sheet (film) printed plastic slide rules. Their market continues in the modern era and have products in stores like Hobby Lobby and Michaels. Generic linear slide rules made by the Parisan Novelty Co.and Graphic Calculator Co, are very similar to the C-Thru designs and constructions, and I suspect they are all licensed (or the patent expired) off the Parisan Novelty Co. Patent US02,073,421 of 1937 by inventor/owner Joseph Komorous of Chicago.

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.

Agitair No. 27 Pocket
ISRM 13.07.03.08

1 page Instructions 2.33MB PDF

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

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_

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

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, CO. Hayward, California

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.

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
The founders of our Company, James Dieterich, Sr. and Rudolf Post, began operations in 1917, with a slogan that we still believe in and maintain today, "Builders of Goodwill."
With that slogan, Mr. Dieterich and Mr. Post launched what has become the finest distributor of drafting and engineering supplies in all the United States. We hope you too will realize the contribution we make to all facets of the drafting, engineering, architectural, reprographics, desktop publishing, and large format printing industries.
Mr. Dieterich, Sr. was born in South Portland, Maine, reared in Boston, and began his career at the age 14 as an errand boy in the blueprint shop run by Bertrand L. Makepeace. It was there that he met Nellie E. Wilson (abt 1918-?), the bookkeeper, who later became Mrs. Dieterich. From the 1940 census, they had two sons James W. Dieterich (b1918) and Robert E. Dieterich (b1922) and lived in Contra Costa, California .
In her memoirs, Nell recalls that, prior to their meeting, Jim's principal ambition in those early boston days was to become a billiards champion(in the footsteps of Willie Hoppe). Thus, to polish his craft and to achieve this goal, he spent most of his evenings in a local pool hall. Obviously, she changed that!
Jim came West in 1910, stopping first to visit with a cousin in Clancy, Montana. Moving on to San Francisco, he became a traveling salesman, then assistant manager for Keuffel & Esser. After a number of years at K & E, he went to work for Victor Post and his brother, Rudolph, who ran the San Francisco branch of the Chicago-based Frederick Post Company. In 1917 Rudolph and Jim bought out Victor's share of the firm, and the Dieterich-Post Company was formed.

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.

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)

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

Archive image

1960 Dieterich-Post Catalog

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^TM

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.

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 Made in Hong Kong for Walt Disney Co. Front Scale Multiplication and Division Back scale: Addition and Subtraction
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 Pencil Co. "Pedigree"

Note: No relation to "Empire Made".

P186 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.

Educational Instruments Inc

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

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)

Favor-Ruhl

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

G. Felsenthal & Sons, Chicago - Established 1898

"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
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)

Foxboro

The Foxboro Comapany, Foxboro, Massachussettes. USA, developed a series of slide rules to assist gas engineers in sizing control valves and in performing calculations relating to orifice meters. These devices were not widely used in gas distribution except for the design of those city gate stations using orifice meter runs to measure the flow of gas. Ref: natgasedu.com

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 (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.

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.

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

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

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.

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

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.

Fullerton-Acu 1240
ISRM 12.10.22.02

In Retail Box w/sheath w/manual No44

Fullerton-Acu Manual No44 (4.15MB PDF)

Pamela Lanier Wolfe (c1969)

Pamela Lanier Wolfe Brown and Husband, Harry Edson Browne (c2000)

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.

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

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)

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)

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

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 )

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 )

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 )

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

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 - Houston, Texas

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.

Gerber Scientific Instrument Co.

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

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

Gerber GraphAnalogue GA-103
Made in USA - Gerber Scientific Instrument Company
Scales: R_I, R_F, R_C,I, F, C_M, T, T, S(Sin)C(Cos), D(Degree Scale), ()², ()²,()^1/2,()^1/3, L₁₀, L_e, L_e, 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.

William D. Gibson Company,

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.
Front Scale
G(RPM), F(Time) [ E(Length), B(Dia) ] [ A(Cutter Dia), C(Speed-FPM) ] D(Feed)
Back: Recommended cutter diameter/RPM

Gisholt Time Computer
REF

All sheet steel construction, dual nested slides.
Front Scale
G(RPM), F(Time) [ E(Length), B(Dia) ] [ A(Cutter Dia), C(Speed-FPM) ] D(Feed)
Back: Gisholt Machine Co. address

Gisholt Time Computer 1951
Plastic Slide chart version. Scans by Jim Cerny

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

Philip Stanley retired from engineering to become a full-time dealer in and appraiser of antique scientific instruments and tools as The Analytical Engine. He has written two books on antique measuring instruments, and numerous articles on instruments and technology, and has given several talks on these subjects. Phil appeared on the Antiques Road Show on PBS, as an appraiser, in 2012, 2013, 2014.

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.
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.

Graphic Calculator Company

The Graphic Calculator Company was founded in 1940 in Chicago, Illinois and later in 234 James Street, Barrington IL, (847) 381-4480. They made custom slide charts as well as low cost give-away promotional slide rules (very similar to C-Thru, but with a nicer cursor). Their website was slide-charts.com, but they do not seem to be in business as of 2012.

Stephenson-Pfahl Hardenability Slide Rule
ISRM 19.10.27.02

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] [S_I - Silicon] [NS_I - Nickel] [CS_R - Chromium] [MS_O 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.

General Motors Truck Performance Calculator
ISRM 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

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

Concrete Volume Computer
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

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

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

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

Stock Yield Slide Rule
ISRM 12.02.19.02

Calculating Yield Example

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

William M. Day

William used this slide rule while working as a Credit Union Examiner for the State of Missouri. He was born on June 27, 1920 in Fort Dodge, Iowa. He volunteered for WWII than afterwards attended the State University of Iowa (now Univesity of Iowa) He majored in business and mathematics and graduated in 1949. He reurned to the Air Force and worked incommunications positions. He retired from military service as a Major in 1972. He worked an additional 10 years as a Credit Union Examiner. He lives in Kansas City, MO.

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

B.F. Grizzle, Washington, DC 20044

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
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 or Guco Line, Marcus Hook, Pennsylvania

Guco Line, 815 Market Street, Marcus Hook, PA 19061, 856-547-1532


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, Camden, New Jersey

Also: 418 Schenectady (SCNDY) St., Schenectady (SCNDY), N.Y.

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 cursor (1943) ISRM 20.04.01.249	Guedon Metal pocket Version 2 cursor 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 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 P176	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
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.
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

John Henschel Company, 195 Marine St., Farmingdale, New York 11735

John Henschel & Company was incorporated in 1925 in New York, NY by John Henschel and C. Ufert, to manufacture and deal in tracing paper and other kindred products. They re-branded OEM slide rules and drafting tools under their company name. The last known artifact is from Aristo in 1952. but the company was refernced in a 1970 publication from the University of Texas Interscholastic League Beginner's Slide Rule manual by Otto G. Brown.

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.

Henry Herbet, 483 5th Avenue, New York, NY(1938)

Hyde Optical Slide Rule (c1939) Photography
ISRM 20.04.01.316

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 Philip Stanley Collection

Human Factors Research, Inc.
Los Angeles, San Diego

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.

INDECO (aka DECO), INDustrial Engineering & Mfg. COrp. Bridgeport, Connecticut (1934-1938)

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)
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.

Jones Metabolism Equipment Co., Chicago, Ill.

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

KAHLSICO - Kahl Scientific Intrument Corp, El Cajon, CA

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

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

Kel-Co (A. Stuart Kelsey Company) Plainview, New York.

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.
The unit has two modes of operation: the "computer mode" which contains the pre-programmed formulas for the Kef-Co class ratings, and a "calculator mode" which is a standard calculator. Regular Kel-Co users will note that some of this manual has been reproduced directly from the third edition of the Kel-Co Class Calculator (Sept. 1971) and from 1979 printing. Some sections are completely new and others have been partially rewritten. To you new Kel-Co users, welcome to the club! Please take the time to understand, absorb, and then apply the principles in this manual. Success at the races is within your grasp, depending only on you!
Good Luck!

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
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
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

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)

Walter J. Kudlaty
Listed in Slide Rule Who's Who Gallery

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

H. McFadden used this slide rule in his work as an engineer.

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".

Lakeside Draft-A-Plan Pocket Slide Rule (1962)
ISRM 15.03.19.01

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

Draft-A-Plan was a beginning drafting kit which had a small electric back lighted table, T-square, 30-60 and 45 degree triangles (made by C-Thru Industries) and this re-branded slide rule made by Lawrence Engineering. It included drafting vellum, lettering guides, tracing and blueprint paper and a small book on drafting practice and math using the slide rule. This kit is missing two small objects, a pencil sharpener and a rubber eraser. A 1974 catalog still shows it being produced. The book for the kit Drafting is Fun can be downloaded on the left (14MB Pdf).

The A. Lietz Co., San Francisco, California (aka ALCO)

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.

News Articles and Catalogs - Only the pages relevant to Slide Rules

1894
Science and Engineering magazine

1893
15pages
13MB PDF

1897
17pages
16MB PDF

1908
8pages
12MB PDF

1911
2pages
386KB PDF

1919
17pages
762KB PDF

1926
23pages
685KB PDF

1938
14pages
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	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
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
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	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 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
Lietz 2976 Mannhiem (USA -Lawrence 10-B) ISRM 15.04.06.02	Lietz 2976 Mannhiem (USA - Lawrence 10-B) 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
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
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, A^F, L, F^A, LL², LL¹, DS, DT, M Back Scale: C, S, ST, T, Fractions-Decimal Note: Scale Labels embossed in RED on transparent cursor
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: equivalents

Lutz Co.

See the Relay Ricoh gallery

Master Electric Co., Dayton, Ohio

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. Pocket ISRM 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.

Goleta and Santa Barbara, California. Metal slide rules.

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.
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 Drawing Instruments, New York City, NY

The Main company was Nobema Drawing Instruments, Germany.

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
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

D.Van Nostrand Co.Inc, New York

Publishers of Scientific and Technical Books

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).

The Use of the Slide Rule, pub1900 by F.A.Halsey. See Reference
Solution of railroad problems by the slide rule, pub1913 by , Edward Richard Cary, (b1865- d????).
Speed and Fun With Figures, pub 1922, by T. O'Conor Sloane, J.E. Thompson and H.E. Licks
A Manual of the Slide Rule, pub1930 by J.E. Thompson,
The Slide Rule, pub1949 by Lee H. Johnson

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.
D.Van Nostrand Mannheim Type Slide Rule 1938 and 1943 Kit Comparisons as packaged with the book Speed and Fun with Figures

Novotni Slide Rule Co. - Chester, PA,and Media, PA.

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 REF	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 Archive - Scan by Phil 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.

James R. Paisley Calculator Company, Pittsburgh, PA.

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.

Parisian Novelty Co.

The Parisian Novelty Company was originally established in Chicago, 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, and C-Thru as the designs and construction are the same. 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 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. Pocket Slide Rule ISRM 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 film. Front Scale A [ B, CI, C ] D Back: Promo advertising: Dittman And Greer, Inc. Providence, R.I., Reps for Chromolox, 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

Perrygraph Corp., Hayward, MI. (Slide Rule Scale Examples)

Perygraf 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 scharts 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.

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.

Plus and Minus Company Corp, New York, N.Y.
Sum-Up Slide Rule Company, N.Y.

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.

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

Intro - The slide rule is designed to add, subtract and convert fractions and decimals of an inch and millimeter, and at the same time,, give the answer in fractions and/or decimals of an inch and/or millimeters. It is a time-saver and a safeguard against mistakes in calculations by other methods. Try a simple problem and see for yourself how easy it is to use this slide rule.
Directions - TO ADD: Locate one figure of your problem in scales A, B, E F or G; set the hairline of runner over this figure. Locate the other figure of the problem on the sliding scales C or D and set the slide so that the figure is under the hairline of the runnder. The sum of the two figures is found in the other scales in line with the O on the slide. Move hairline of the runner to this O and read your answer in fractions, decimals of an inch/and or millimeters.

Precision Scale Co., Phoenix, Arizona

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?	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 Stephen Kay of Solon, Ohio
Precision Scale Co Model 1752 Log Log e Hyperbolic REF Got a scan or one to donate?	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, ST, S, CI, C ] D, DI, K, L Back scale: Unknown Archive photo, source unknown
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

Prestige

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.

Science Services, Inc., Washington, D.C.
"Things of Science"

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.

Computation Experiments (4.48MB Pdf)

Science Services Slide Rule (1963)
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

Slide Rule and Scale Engineering

Slide Rule and Scale Engineering, CO. (1930-1950)
Laporte, Indiana, New Carlisle, Indiana and Mt. Olive, Illinois

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.

REF SR&SE Co - Concrete Quantity Calculator	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
S556 SR&SE Co - Concrete Quantity Calculator Full Size Flyer 7.77MB	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
REF SR&SE Co - Concrete Quantity Calculator	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
REF SR&SE Co - Brick And Tile Computing Slide Rule	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

Gilbert Small, Waltham, Massachusetts

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

The Spirule Co., Whittier, California

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	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.

T and T Electric Manufacturing (c1938)
975 So. Raymond Avenue, Pasadena 2, California, SYcamore 9-3424
Later: 933 S. Fair Oaks Avenue, Pasadena, California

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)
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.
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

Henry W. Tomlinson

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)

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

Tru-Bilt

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

U.S. Blue

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 Company

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
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
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
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 REF	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 ] Ebay photo
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
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
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

Whitehead & Hoag, Newark, New Jersey

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 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 (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

Instructions

Whitehead & Hoag Generic Slide Rule Version 1
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

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

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.

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.

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

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.

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.

Misc OEM - Promotional Rules

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 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 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
P117 Dupa 012b General Electric	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
P187 Fawick Airflex	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
P213 Globemaster 62200	Globemaster 62200 Made in Japan for Globemaster Front Scale A, [ B, CI, C ] D, K Back Scale: Blank Sleeve adv: Globemaster 5" Plastic Slide Rule
P144 Johnston Bros	Johnston Bros - Simplex Made in USA - Probably by Sterling Front Scale A [ B, CI, C ] D, K Back Adv: Johnston Bros, Ferrysburg, Michigan
ISRM RCA 551	RCA 551 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
P181 RCA 551	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
P166 SKF [ Early Hemmi 74 Variant ]	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
P145 Swinston - Mesta	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