Misc. United States of America

American Spring of Holly, Inc., Holly, Michigan.

American Spring of Holly was founded by Howard Malcolm Smith (1897-1966) in 1929 after resigning from the Gauranty Trust Company in New York where he worked as a banker after graduating from Princeton in 1919. He was the son of a Brooklyn, N.Y. banker and Howard prepared at Lawrenceville School in New Jersey. In the fall of 1918, he enlisted in the Student Army Training Corps and was honorably discharged after the Armistice. He was awarded the degree of Civil Engineer in June. His original plan was to work in engineering, but he found immediate work in banking because of his father's connections. Banking failures abounded in 1929, so at this point he decided to apply his engineering training to American Spring of Holly, Inc., a small company in which he owned an interest. He moved to Holly, Mich. and took over the management. Earnings changed from red to black, and Howard's sales activities led him to travel in a Beech Bonanza, which he personally flew more than 3,000 hours. In 1958, he sold the business and tried retirement, but found himself doing consulting work for a local subsidiary of Illinois Coil. Before his death, he he established an electronics laboratory in his basement where he spent many happy hours inventing new devices. This collection of slide rules were part of his estate, gifted by the husband of his granddaughter, Patricia (nee Walker) Moody. Her father R.L.(Lloyd) Walker worked at American Spring after WWII.

K&E 4088-3 Polyphase Duplex (c1933) ISRM 23.02.05.03 Analysis of handwritten markings placed by H.M.Smith by Courtesy of Andreas Faßbender	K&E 4088-3 Polyphase Duplex sn419109 c1933 Made in USA by Keuffel & Esser Patent markings: June 5, '00; DEC 12, '08 (on lower stock). Patent Pending (on Cursor block) Front Scale: K, A [ B, S, T, CI Handwritten Spring constants for Sq and Round wire ] D, L Back Scale: DF [ CF, CIF, C ] D Original Owner:Howard Malcolm Smith (1897-1966), founder of American Spring of Holly. His personal slide rule. Gifted by Bruce Moody of Fort Mill, South Carolina. Note: This was the slide rule used by Howard M. Smith to design his first spring products. The written markings correspond to round (R) and Square (SQ) profile wire constants for steel (STL) and Bronze (BRZ) in Lengths of Feet (FT R and FT SQ) and Inches (IN R and SQ). There are additional gauge marks added on the CI scale (from left to right). V=887, W=474, V=281 and W=148. We can only assume that these marks V and W refer to Volume and Weight. There may be differences in properties from that time period in the 1930's and to the modern era.
American Spring of Holly Slide Rule ISRM 23.02.05.01	American Spring of Holly Spring Design Slide Rule - c1950 Made by Acu-Rule for American Spring of Holly, Inc.. Co., Holly, Michigan. All plastic stock Front Scale (Step 1 - design spring force): Wire Size [ Wires Size, Load, Ratio: D/d, Rect: ratio b/t ] Lbs per Inch Deflection Back Scale (Step 2 - determine design stress): Mean Dia [ Mean Dia., Active Coils, Rect: ratio b/t ] Stress Note: Compare spring design scales with the Pickett ASC slide rules and Connecticut Spring Corp manuals. Original Owner:Howard Malcolm Smith (1897-1966), founder of American Spring of Holly. Gifted by Bruce Moody of Fort Mill, South Carolina.
American Spring of Holly Slide Chart ISRM 23.02.05.02	American Spring of Holly Spring Design Slide Chart - c1952 Made by/for American Spring of Holly, Inc.. Co., Holly, Michigan. Clear Plastic cover and plastic stock riveted together Front Scale (Step 1 -design spring force): Wire Size [ Wires Size, Load, Ratio: D/d, Rect: ratio b/t ] Lbs per Inch Deflection Back Scale (Step 2 - determine design stress): Mean Dia [ Mean Dia., Active Coils, Rect: ratio b/t ] Stress Note: Compare spring design scales with the Pickett ASC slide rules and Connecticut Spring Corp manuals. Original Owner:Howard Malcolm Smith (1897-1966), founder of American Spring of Holly. Gifted by Bruce Moody of Fort Mill, South Carolina.
American Spring of Holly K&E Spring Design prototype Slide Rule ISRM 23.02.05.04	American Spring of Holly K&E Spring Design prototype Slide Rule - c1955 Made by K&E prototype for American Spring of Holly, Inc.. Co., Holly, Michigan. Based on 4053-3 sn960135. Top of stock and slide has custom scales for spring designs. Front Scale : 25cm // Inches, P.D. [No. Coils, Wire Size Brz ] Lbs per Inch \\ 10in Back Scale : [ S, L, T ] and Equivalents Original Owner:Howard Malcolm Smith (1897-1966), founder of American Spring of Holly. Gifted by Bruce Moody of Fort Mill, South Carolina. Note: The overlay that was placed on top of the mahogany stock, presumably by K&E, is marked with the name "M.M. Smith '39." This person would be the designer of the scale.

Arlton Workshop, Lennox, South Dakota

Arlton Workshop was a small firm in Lennox, South Dakota, consisting of three brothers (Roland, Stan, Dean and/or Paul), all teachers, which specialized in creative design and manufacture. The initials "SA" on the specimen (see detailon left), which was copyrighted in 1959, most likely means that the slide rule was designed by Stanley (Stan) Arlton (1925-2007) who taught math and physics. His obituary says:" He attended Mitchell Public Schools and studied at several colleges including Dakota Wesleyan University in Mitchell and Pacific Lutheran College in Tacoma, Wash. He received his undergraduate degree from Augustana College in Sioux Falls, S.D., and his masters degree in math from Western Connecticut State University. He had near majors in physics and German. In 1943 he was inducted into the U.S. Army as a high-speed radio operator. Stan had a great interest in mathematics and designed and produced a novel circular slide rule that [supposedly see note below] was flown on the first Apollo moon mission as a computer backup. He always enjoyed solving complex math problems. His first teaching position was at Tripp High School in Tripp, S.D., where he taught math, physics, chemistry and English while also serving one year as the school principal. He directed both church and community choirs (note the musical scale on the slide rule). His last teaching assignment was at Hillcrest Academy where he taught mainly physics and computer science. Here again he enjoyed being assistant director for the community choir. Stan loved travel and sought an overseas teaching assignment that resulted in four years of teaching at the Yamato High School (Yamato Air Force Base) in Tokyo, Japan. He had two sons, David and Paul Arlton (who became aerospace engineers). Note: Quote from a Blogger named Armin: "I knew the man who invented that (referencing a photo of a Pickett 109-ES) slide rule. He taught at my school. His name was Stan Arlton. He was an amazingly clever, warm-hearted and slightly eccentric fellow. One of his slide rules traveled with the Apollo missions."

Arlton "The Cadet" Pocket Slide Rule ISRM 23.05.05.01

Arlton "The Cadet" Pocket Circular Slide Rule - 1959 Made in USA by Arlton (Bros.) Workshop, Lennox, South Dakota. Designed by Stan Arlton. Note: 4inch[10cm] diameter,cardboard disk with riveted cursor. This was created originally for use by Stan's high school students Front Scale: C ( D ) Back: Blank Original Owner: Stanley (Stan) Arlton (1925-2007) Gifted by Dave Arlton, Son of Stan Arlton.

Arlton Conversion Slide Rule - 1959 ISRM 23.04.11.01 Ted Baumen (1974), Instructions.

Arlton Conversion Slide Rule ©1959 Made in USA by Arlton (Bros.) Workshop, Lennox, South Dakota. Designed by Stan Arlton. Note: Possibly distributed by TAD Products Corp. Beverly, MA. (in business from 1963 to 1990) Note: 6.75inch[17cm] diameter,0.05in[1.3mm] thick plastic disk with riveted cursor Note: 90 direct conversions, and more than 700 formulas, values and identities Front Scale: L, DI, LOG or Conversion Factors, D, S, T ( C, R, Even Tempered Musical scale, K(2 spiral scales), ) Back Table Constants and formulae for:: Mechanics, Heat, Sound, Light, Electricity, Measurement, Trigonometry and Astronomy. Original Owner:Ted Baumen (c1933- ) Gifted by Ted Baumen Jr. and Dawn Baumen.of University Park, Florida. Ted Baumen.was an immigrant from Holland who came across the Atlantic in 1953 on the USS United States. He studyied to become an electrical engineer and ultimately worked for a large aerospace and building services company in the US and Canada. Throughout his studies and his career, he used many slide rules for both mathematical calculations and US-Metric conversions. He was part of a team that worked on the electro-mechanical interface for the CF104 Fighter (built in Canada by Canadair under license from Lockheed) which was a key element of the autopilot and auto pitch control systems. When Ted retired, he passed on his slide rules to his son, Ted Jr. a mechanical engineer, who had an interest in the elegance of these analog devices. At that time, mathematical calculations were becoming much easier to do by calculators, however, slide rules for US-Metric conversions remained very helpful (especially, in the absence of an on-line search tool to look up conversion factors). Ted jr. recalls: "I remember my father commenting that the slide rules gave him a more visual sense of how calculations were done and an intuitive sense that the answer was correct. He fond of saying, 'no batteries required'".

Associated Spring Corp. (Wallace Barnes Co.)

Associated Spring Corporation was founded in 1857 by Wallace Barnes (1827 - ?) and is one of only a few companies in the U.S. that have been in the business of making springs for more than 150 years. The Wallace Barnes Company was located in Bristol, Connecticut, and when Wallace left the company in 1893, his son Carlyle Barnes took over, and was later succeeded Carlyle's son, Fuller Forbes Barnes, who took over as general manager of the company, which continued to grow through acquisitions. The company was initially known for making hoop-skirt springs, but in 1859 adapted to the clock industry in the Bristol area at the time, along supplying springs for gun and bicycle manufacturing. In 1933, company president Fuller Barnes was instrumental in starting the Spring Manufacturers Association, which later became known as the Spring Manufacturers Institute (SMI). Throughout its history, several ASC spring design slide rules were made available to mechanical engineers to promote their product lines. Many of these images are duplicated on the Pickett Gallery.and K&E Specialty Gallery

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 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)
Associated Spring Corp (JB Carroll) Helical Spring Design - 1952 REF	Associated Spring Corp (JB Carroll) Helical Spring Design - 1952 Made in USA by J.B. Carroll.for Associated Spring Corp (ASC) - Original design(c)1952 Front Scale: P/f or M/T [ S, KT, D (Dia O.D. coil), D/d, ■ ● ] d (dia O.D. wire) Back Scale: P or M [ N (number of coils), DT, G, E, D, ■ ● ] d Archive - Scan by Mike Syphers Collection
Associated Spring Data Computer Slide Chart (1960) REF	Associated Spring Data Computer Slide Chart (1960) Made in USA - Associated Spring Corp (ASC) - Design©1960 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)
Pickett 1025 Helical Spring Design - 1952-56 ISRM 13.00.00.67	Pickett 1025 - Helical Spring Design - 1952-56 Made in USA - Associated Spring Corp (ASC) - Original design(c)1952 Front Scale: P/f or M/T [ S, KT, D (Dia O.D. coil), D/d, ■ ● ] d (dia O.D. wire) Back Scale: P or M [ N (number of coils), DT, G, E, D, ■ ● ] d Original owner: J.B. Beckwith, Spring Designer at ASC Archive - donated by Jack Rababeh, Senior Engineer at ASC 1952 Manual 3.41Mb
Pickett 1025 - Helical Spring Design 1957-1958 ISRM 13.09.17.02	Pickett 1025 - Helical Spring Design - 1957-1958 Made in USA - Associated Spring Corp (ASC) - Design©1952 Front Scale (artwork #107): P/f or M/T [ S, KT, D (Dia O.D. coil), D/d, ■ ● ] d (dia O.D. wire) Back Scale: P or M [ N (number of coils), DT, G, E, D, ■ ● ] d Original owner: Tom Pulley, engraved on slide.
Pickett 1025 - Helical Spring Design REF S127 A low cost 1960 cardboard version of the times	Pickett 1025 - Helical Spring Design - c1959 Made in USA - Associated Spring Corp (ASC) - Design©1952 Front Scale: P/f or M/T [ S, KT, D (Dia O.D. coil), D/d, ■ ● ] d (dia O.D. wire) Back Scale: P or M [ N (number of coils), DT, G, E, D, ■ ● ] d
Pickett 1025 - Helical Spring Design 1962 ISRM 13.00.00.70	Pickett 1025 - Helical Spring Design - 1962 Made in USA - Associated Spring Corp (ASC) Note: Modern logo, curved bracesconvex lens. Front Scale: P/f or M/T [ S, KT, D (Dia O.D. coil), D/d, ■ ● ] d (dia O.D. wire) Back Scale: P or M [ N (number of coils), DT, G, E, D, ■ ● ] d Archive - donated by Jack Rababeh, Senior Engineer at ASC
Pickett 1100 - Helical and Flat Spring Design - 1962 ISRM 13.00.00.69	Pickett 1100 - Helical and Flat Spring Design - 1962 Made in USA - Associated Spring Corp (ASC) Front Scale (artwork 67): Flat Springs Pounds/M [ Length, Material Properties, Wire Shape Correction factor, Width] Thickness Back Scale (artwork 68): Helical Springs Pounds/M  [ No.Coils, Material Properties, ■ ● , Mean Dia ] Wire Dia Archive - Donated by Jack Rababeh, Senior Engineer at ASC
K&E Associated Spring Belleville Spring Washer Computer S409	K&E Associated Spring Design - Belleville Spring Washer Computer Made in U.S.A. by K&E for Associated Spring 1967 Front Scale Load Flat [ OD, OD/ID (2 scales), h/t, E/1-σ2 ] Thickness Back Scale Load Flat [ OD, OD/ID (4 scales), h/t, E/1-σ2 ] Stress Archive - Scan donated by Jack Rababeh, the Manager og Program Engineering at Barnes Group Inc. (aka Associated Spring). M145 Instructions 5.69Mb

AVOL Mfg. Co., Portland, Oregon

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

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

Arthur Brown & Bro 7993A REF P210	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
Arthur Brown & Bro 7996A ISRM 13.00.00.89	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
P210 Arthur Brown & Bro 7997A Proportional Slide Rule	Arthur Brown & Bro 7997A Proportional Slide Rule Made in USA Folder stanless steel construction Front Scale : 6inch, A [ B, C ] D, 36 Picas. Back: Blank

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 ISRM 20.04.01.428	Charles Bruning Cat.No. 2398 Pocket Duplex Made in USA by Charles Bruning Front Scale: K, A [ B, ST, S ] D, T Back Scale: DF [ CF, CI, C ] D, L Gift of Philip Stanley of Worchester, Mass. Manual (4.35MB PDF) courtesy of Greg Scott's Slide Rules
Charles Bruning 2401 ISRM 12.02.12.01	Charles Bruning 2401 Made in USA - Westinghouse Electric Promo Note Frederick Post 1444P wide metal framed cursor variation Front Scale: 12.5cm // A [ B, CI, C ] D, K \\ 5in Back Scale: [S, L, T ] Back Blank Note: Body same as Post 1444-P
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 - Borg-Warner Promo ISRM 22.05.06.36 (Replaced 13.07.03.06)	Charles Bruning 2401 - Borg-Warner Promo Made in USA Note Narrow metal framed cusor design Front Scale: 12.5cm // A [ B, CI, C ] D, K \\ 5in Back Scale: [S, L, T ] Back Advertising(and on sleeve): Borg-Warner Corporation, Marvel-Schebler Carburetor Div. Gift Of Nancy Ulrich Ted Ulrich Collection Insert Instructions (3.7MB pdf) Copyright 1944 Notice this advertisment for a magnifying lens by Bruning.
Charles Bruning 2401 (New plastic Cursor) ISRM 22.07.06.148	Charles Bruning 2401 - Molded one-piece cursor lens Made in USA by Charles Bruning Co. Front Scale: 12.5cm // A [ B, CI, C ] D, K \\ 5in Back Scale: [S, L, T ] Back: Blank Gift Of Cindy Tate, Bozeman, Montana. Victor B. tate Collection.
Charles Bruning 2401 Texas Instruments ISRM 14.07.02.07	Charles Bruning 2401 (Newer Cursor) Texas Instruments Made in USA - Advertising use - Body same as Post 1444P Front Scale: 12.5cm // A [ B, CI, C ] D, K \\ 5in Back Scale: [S, L, T ] Back Adv: Texas Instruments, Semiconductor Components Division. Gift Of Ed Millis, Dallas, Texas. Ed worked at TI in this division which developed the electronic calculator.
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 Instructions (3.7MB pdf) Copyright 1944
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

Engineering Mfg. Co., Chicago, ILL

CALC-SLIDE 10-in Mannheim with Magnifier ISRM 24.07.04.47	CALC-SLIDE 10-in Mannheim with Magnifier c1940 Made in USA by Engineering MfgCo., Chicago, Illinois Front Scale: 10in // A [ B, CI, C ] D, K Back Slide: Blank Back: Instructions Gift of Debbie Dilatush, Tom Dilatush Collection.
CALC-SLIDE 10-in Mannheim REF	CALC-SLIDE 10-in Mannheim c1940 Made in USA by Engineering MfgCo., Chicago, Illinois Front Scale: 10in // A [ B, CI, C ] D, K Back Slide: Blank Back: Instructions Archive - Joe Haupt Collection.

CENCO - Central Scientific Co. Chicago, Illinos

Full 1912 Catalog M Smithsonian American History Museum. Note Four slide rule models are described in this catalog.

Central Scientific Company was founded in 1900 in downtown Chicago. It was created from of what was left of the Olmstad Scientific Company. Central Scientific manufactured and distributed science teaching equipment for schools, colleges, and universities by catalog mail order. The trademark CENCO was used from 1909 onwards. CENCO dominated the field of selling science education equipment through their mail order catalog. By 1935, the company established itself as one of the leading national suppliers of science equipment. During World War II, part of the manufacturing facility was turned over to the production of war necessities, making bombsights for airplanes and fuses for large bombs. After 1968, the company began having financial difficulties. In 1974, the assets were sold off to competitors. The educational business retained the name Central Scientific Company. In April 1979, Central Scientific's assets and activities were acquired by two businessmen from Buffalo, New York. They sold the business to Sargent-Welch (their main competitor) in 2000.

CENCO No. 73256 Plastic Slide Rule c1940 ISRM 22.05.37

CENCO No. 73256 (Parisian Novelty Co.) Plastic Slide Rule c1940 Made in USA by Parisian Novelty Co., Chicago, Illinois for Central Scientific Co. Catalog Patent US02,073,421 Inventor: Joseph Komorous Riverside, Ill. Material: Folded Thin plastic film. Front Scale: A [ B, CI, C ] D Back Scale: T, L, S Front slide: 6in, 15.3cm Back of slide Decimal Equivalents Well: Equivalents (US Bureau of Standards No. 47) Note: around 1970 this was purchased new by Ted Ulrich from the National Bureau of Standards in Washington, DC Gift Of Nancy Ulrich for Ted Ulrich Collection

Central Scientific Co. Gas Volume Reduction Chart 1921 REF

Central Scientific Co. Gas Volume Reduction Chart 1921 Made in USA by Central Scientific Co., 412 to 420 Orlens Street, Chicago Front Scale: 1-79mm, Volume Factor (in window) ( 1-10-100, 10$deg;C to 35°C Archive - American History Museum, SI Collection

Climatemaker Slide Rule Co., Box904, Bloomington, Illinos

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 Front Scale: Forced Air |stack size, Pipe Size, Pipe Area, CFM, BTU| [ Losses 6-21, Wind, Temp Diff, single glass, Storm Windows ] CFM No 2, Sq Ft Hot Water Rad, Sq Ft Steam Rad. Back scale: Gravity |3rd floor(Stack, Pipe size, Pipe Area|, Gravity |2rd floor(Stack, Pipe size, Pipe Area|, Gravity |1st floor(Pipe size, Pipe Area|, [ Losses 22-40, Temp Diff, single glass, Storm Windows ] Gravity |1st floor(Pipe Area, Pipe size|, Gravity |2rd floor(Pipe Area, Pipe size, Stack|), Gravity |3rd floor|Pipe Area, Pipe size,Stack| Archive - no longer in collection

Connecticut Spring Corp, Hartford Connecticut

Connecticut Spring Corporation, was founded by Bertram E. Youmans (1909-1990) in 1939. He was born in Massachussetts and by 1935 he was living in Hartford, Connecticut. When his son, Peter S. Yeomans (1940- ) took over, the company expanded and it became Connecticut Spring and Stamping (CSS), Corp. in Farmington, CT, CSS is still family owned with over 400 employes Family Members currently employed: Peter Youmans, CEO; Steve Dicke, President, Son-In-Law; Jake Youmans, Management Apprentice, Grandson; Veronica Dicke, Management Consultant, Daughter. Many of these images are duplicated on the Acumath Gallery

Connecticut Spring Corp Spring Design - Version 1 REF	Connecticut Spring Corp Spring Design - c1945 - Version 1 Made by Acu-Rule for Connecticut Spring, Hartford, CT. Magnesium stock. One-sided metal brace. Slide has finger pockets Front Scale: Wire Size [ Wire Size, Load, Ratio D/d, Rect: ratio b/t ] Lbs per Inch Deflection Back Scale: Mean Dia [ Mean Dia, Active coils, G, Rect: ratio b/t ] Stress Archive - Billy Guthrie collection Instructions 3.31MB
Connecticut Spring Corp Spring Design - Version 2 ISRM 21.10.13.01	Connecticut Spring Corp Spring Design - c1950 - Version 2 Made by Acu-Rule for Connecticut Spring, Hartford, CT. All plastic stock. One-sided metal brace. Slide has finger pockets Front Scale (Step 1 - design spring force) Wire Size [ Mean Dia., Active Coils, Rect: ratio b/t ] Lbs per Inch Deflection Back Scale (Step 2 - determine design stress) Mean Dia [ Wires Size, Load, Ratio: D/d, Rect: ratio b/t ] Stress Note: Compare spring design scales with the Pickett ASC slide rules and manuals. Original Owner Initials: J.W.H. (on sleeve)
Connecticut Spring Corp Spring Design - Version 3 ISRM 05.03.10.01	Connecticut Spring Corp Spring Design - c1955 - Version 3 Made by Acu-Rule for Connecticut Spring, Hartford, CT. All plastic stock. Double-sided braces. Front Scale (Step 1 -design spring force) Wire Size [ Mean Dia., Active Coils, Rect: ratio b/t ] Lbs per Inch Deflection Back Scale (Step 2 - determine design stress) Mean Dia [ Wires Size, Load, Ratio: D/d, Rect: ratio b/t ] Stress Note: Compare spring design scales with the Pickett ASC slide rules and manuals. Instructions 3.31MB

C-Thru Ruler Company

C-Thru No. 27 Pocket (Version 1) ISRM 21.06.10.34	C-Thru No. 27 Pocket (Version 1 - Trig scales on back of slide) Made in USA - C-Thru Ruler, Hartford, Connecticut Note: Folded Sheet Plastic Slide Rule Front Scale : A [ 5in, B, CI, C, 12.5cm ] D Back Scale : S, L, T Well: Units Equivalants Back Slide: Decimal Equivalents Gift of Bob Dehn Collection Instructions 670Kb
C-Thru No. 27 Pocket (Version 2) ISRM 12.02.19.01	C-Thru No. 27 Pocket (Version 2 - Trig scales on back of stock) Made in USA - C-Thru Ruler, Bloomfield, Connecticut Note: Folded Sheet Plastic Slide Rule Front Scale : A [ 5in, B, CI, C, 12.5cm ] D Back Scale : S, L, T Well: Units Equivalants Back Slide: Decimal Equivalents Original owner: Bruce Day of Kansas City, Missouri Donated by wife, Nancy Day of Kansas City, Missouri William Bruce Day was given his first slide rule when he was in high school while his father, William M. Day, was stationed at Vandenburg AFB. Bruce later became a career military officer who flew B-52 missions in Vietnam and later C130s as a member of the reserves, retiring as a Lt. Col. Bruce obtained this slide rule after retiring from the Military. His civilian life was spent as a Patent and Trademark Attorny in Kansas City, where he still resides. His K&E 68-1617 slide rule is shown in the K&E Standard gallery.
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)

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.
Digi-Craft Digital Thermometer Metric Converter Deskset REF	Digi-Craft Digital Thermometer Metric Converter Deskset Made in USA. Front Scale: 12in, °F, °C, C [ Length, Area, Weight, Volume Conversion ] D, 30cm Promo: R.W. Sigman Inc. Gifts to J. Eaton and S.Wolfe. Ambient Temperature glows through the plastic. No batteries. This must have been a promotional item. Archive - Photo by John Edmundson
Digi-Craft Digital Thermometer Metric Converter Deskset REF	Digi-Craft Digital Thermometer Metric Converter Deskset Made in USA. Front Scale: 12in, °F, °C, C [ Length, Area, Weight, Volume Conversion ] D, 30cm Promo: Mear Man's, E-Z-Ex Wormer with TBZ Trademakm of Merck & Co.. Ambient Temperature glows through the plastic. No batteries. This must have been a promotional item. Archive - Ebay Photo

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"

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)

Fisher Controls, Marshalltown, Iowa

William Fisher 1838-1906 Jasper H. Fisher 1878-1938 Jasper W. Fisher 1914-1990

The Fisher Controls Company, is one of the oldest and largest global designers, manufacturers, and suppliers of control valves and regulators to the chemical, refining, power, and pulp and paper industries. Founded in 1880 by William Fisher (1838-1906), William moved to the US from England when he was 14, settling in Iowa. His first job was in a small engine shop, where he became well-versed in steam power. Next, he helped to install new water facilities in three Iowa cities and made a name for himself. As a raging fire in Marshalltown, Iowa, threatened to engulf the city, William and a few others spent hours throttling the city’s steam-driven pumps by hand, to provide steady and constanst water pressure. This fire inspired him to create a control device to control pumps and maintain them at constant pressure. After months of experimentation, Fisher built the Fisher Type 1 constant pressure pump governor in 1880. Fisher Governor Company was incorporated in 1888 . By 1905, company sales had reached $44,000; by 1907, his invention was in power plants throughout the entire United States, Canada, and Great Britain. And the two of them oversaw some of Fisher’s most significant advancements and growth. Fisher Governor Company enjoyed substantial profits from the development of steel, petroleum, power, and gas in the 1920’s industrial boom. Their valves being indispensable in each of the burgeoning industries. With the onset of World War 1, demand for Fisher’s products in various industries rose dramatically, particularly in the petroleum industry. As a result, the Company quickly grew from a shop of nine machinists and five office employees to over 60 workers. In 1938 then VP, Jasper Henry Fisher (1878-1938), son of William, died. His wife, Florence Edna Baughman Fisher (1879-1960) served as President for 10 years. Jasper’s son, Jasper “Bill” Fisher, (1914-1990) became VP, and his wife, Dorothy Elizabeth Meyer Fisher (1914-1998), like Jasper’s mother before her, took over as President. Fisher entered into a licensing agreement with Elliott Automation of the UK in 1950, the two companies would manufacture Fisher valves and controllers jointly. It was about this time that the company contracted with Pickett to make custom slide rules. Other makers soon followed in the UK and Germany with their own design variations. In 1955, Fisher expanded production into Canada, opening a factory in Ontario to meet the demands of the burgeoning oil and natural gas industries. Fisher’s emphasis on new products built on further technological advancement continued throughout the 1960s, and they entered into a new licensing agreement to manufacture in Japan. The following year, 1965, Fisher opened a factory in Mexico City.

Fisher Control Valve Sizing Rule (Pickett) 24.05.05.27 Jon F. Monsen - ( ? - 2023) San Jose, California, USA. was a control valve technology specialist for Valin Corporation. Jon wrote a book detailing the many facets of control valves, titled Control Valve Application Technology, Continued on right	Fisher Control Valve Sizing Rule (Pickett) ©1954 Made in USAby Pickett for Fisher Governor Co, Marshal Town, Iowa Front Scale: Steam Valve Sizes, Pressure Drop, D [ C, Sp Gr, Viscosity, Flow, Q] D, Cv, Liquid Valve Sizes Back Scale: P1, PC, PSIG [ P0, ∆P, Sp.Gr., Gas Temp., Quality, Q ] Cg, CS, Gas valve Sizes Gifted by Dan Robertson. Belonged to the Jon F. Monsen Collection Cont'dTechniques and considerations for properly selecting the right control valve, which outlines the process of selecting control valves for a number of different applications. Jon had 35 years of industry experience and had lectured nationally and internationally on control valve sizing and applications. Jon was also the author of the chapter on "Computerized Control Valve Sizing" in the ISA Practical Guides book on Control Valves, a reference book written by 21 experts and utilized by many members of the control valve industry. He wrote a series of columns for Valve Worls magazine. Valine Corp created the Monsen Innovation Award given to recipients that are recognized for their outstanding accomplishments and dedication to the company. Jon collected slide rules related to the control valve industry, and enjoyed model trains and building 1:500 scale miniature trains. His wife was Paulette Monsen.
Fisher Universal Valve Sizing Rule - Pickett 1041 24.05.05.26	Pickett 1041 - Fisher Universal Valve Sizing Rule (c)1967 Made in USA by Pickett for Fisher Governor Co, Marshal Town, Iowa Front Scale: PSI, Pressure Drop [ Inlet press., Gas SG, Temp, C1 Q] D, Cg/Cs, %QC1 Back Scale: ∆P, %QC2 [ P1, CIF, L, CI, C ] Q, Cv, Cg Gifted by Dan Robertson. Belonged to the Jon F. Monsen Collection
Fisher  Universal Valve Sizing - Pickett N1041-GP ISRM 24.05.05.23	Fisher Universal Valve Sizing Rule (Pickett N1041-GP) -c1970 Made in USA by Pickett (Microline stock) for Fisher Governor Co, Marshal Town, Iowa Front Scale: PSI, Pressure Drop, %QC2 [ Inlet press., Gas SG, Temp, C1, Q ] D, Cg/Cs, %QC1 Back Scale: ∆P, %QC2 [ P1, Inlet Density, Flow Q ] Cv, Cg Instruction Card Gifted by Dan Robertson. Belonged to the Jon F. Monsen Collection
Fisher Controls Universal Valve Sizing BHL FC3540 UK ISRM 24.05.05.43	Fisher Controls Universal Valve Sizing BHL FC3540 UK 1967 Made in USA by BHL Blundell Harling, Weymouth. Designed by Fisher Governor Co, Marshal Town, Iowa Front Scale: PSI, Pressure Drop, %QC2 [ Inlet press., Gas SG, Temp, C1, Q ] D, Cg/Cs, %QC1 Back Scale: ∆P, %QC2 [ P1, Inlet Density, Flow Q ] Cv, Cg Gifted by Dan Robertson. Belonged to the Jon F. Monsen Collection
Fisher Controls Universal Valve Sizing Mark III Blundell P-1732A UK ISRM 24.05.05.45	Fisher Controls Universal Valve Sizing Mark III Blundell P-1732A UK 1967 Made in UK by Blundell, Weymouth. Designed by Fisher Governor Co, Marshal Town, Iowa Front Scale: PSI, Pressure Drop, %QC2 [ Inlet press., Gas SG, Temp, C1, Q ] D, Cg/Cs, %QC1 Back Scale: ∆P, %QC2 [ P1, Inlet Density, Flow Q ] Cv, Cg Gifted by Dan Robertson. Belonged to the Jon F. Monsen Collection
Fisher Controls Universal Valve Sizing Mark V, GEC-Elliot, UK ISRM 24.05.05.44	Fisher Controls Universal Valve Sizing Mark V, GEC-Elliot, UK 1967 Made in UK by Blundell, Weymouth. Designed by Fisher Governor Co, Marshal Town, Iowa Front Scale: PSI, Pressure Drop, %QC2 [ Inlet press., Gas SG, Temp, C1, Q ] D, Cg/Cs, %QC1 Back Scale: ∆P, %QC2 [ P1, Inlet Density, Flow Q ] Cv, Cg Gifted by Dan Robertson. Belonged to the Jon F. Monsen Collection
Fisher Controls Ventil Rechenschieber Mark VI, IWA 05136 ISRM 24.05.05.46	Fisher Controls Ventil Rechenschieber Mark VI, Elliot Automation 1968 Made in Germany by IWA, for Elliot Automation GMBH. Designed by Fisher Governor Co, Marshal Town, Iowa Front Scale: PSI, Pressure Drop, %QC2 [ Inlet press., Gas SG, Temp, C1, Q ] D, Cg/Cs, %QC1 Back Scale: ∆P, %QC2 [ P1, Inlet Density, Flow Q ] Cv, Cg Gifted by Dan Robertson. Belonged to the Jon F. Monsen Collection
Fisher Controls Valve Sizing Slide Rule Mark VI-E, IWA 05136 ISRM 24.05.05.49	Fisher Controls Valve Sizing Slide Rule Mark VI-E, GEC-Elliot, UK 1968 Made in Germany by IWA, for Fisher Governor Co, Marshal Town, Iowa Front Scale: PSI, Pressure Drop, %QC2 [ Inlet press., Gas SG, Temp, C1, Q ] D, Cg/Cs, %QC1 Back Scale: ∆P, %QC2 [ P1, Inlet Density, Flow Q ] Cv, Cg Gifted by Dan Robertson. Belonged to the Jon F. Monsen Collection

Foxboro Company, Foxboro, Massachussettes

Foxboro Piping And Flow Rule (Cox & Stevens) ISRM 24.05.05.25	Foxboro Piping And Flow Rule (Cox & Stevens) c1940 Made in USA by Cox & Stevens Aircraft Corp. . Front Scale: (Pipe Schedules) Back Scale: Flow Nozzles. Gifted by Dan Robertson. Belonged to the Jon F. Monsen Collection Jon F. Monsen - ( ? - 2023) San Jose, California, USA. was a control valve technology specialist for Valin Corporation. Jon wrote a book detailing the many facets of control valves, titled Control Valve Application Technology, Techniques and considerations for properly selecting the right control valve, which outlines the process of selecting control valves for a number of different applications. Jon had 35 years of industry experience and had lectured nationally and internationally on control valve sizing and applications. Jon was also the author of the chapter on "Computerized Control Valve Sizing" in the ISA Practical Guides book on Control Valves, a reference book written by 21 experts and utilized by many members of the control valve industry. He wrote a series of columns for Valve Worls magazine. Valine Corp created the Monsen Innovation Award given to recipients that are recognized for their outstanding accomplishments and dedication to the company. Jon collected slide rules related to the control valve industry, and enjoyed model trains and building 1:500 scale miniature trains. His wife was Paulette Monsen.
Foxboro Flow And Valve Rule Stainless Steel (1939) ISRM 22.11.16.01	Foxboro Flow And Valve Rule (1939) Made in USA . Front Scale: Sizes [ Valve sizes, Drop Pounds, gas, Cu. Feet/day Flow ] Steam Lbs per hour. Back Scale: Tables Donated By Joel Hirsfield of Turbull, Connecticut.
Foxboro Stabilflo Valve Sizes Slide Rule (1942) ISRM 24.05.05.28	Foxboro Stabilflo Valve Sizes Slide Rule (1942) Made in USA by Whitehead-Hoag . Front Scale: Sizes [ Valve sizes, Drop Pounds, gas, Cu. Feet/day Flow ] Steam Lbs per hour. Back Scale: Sizes [Orifice and Venturi] Gifted by Dan Robertson. Belonged to the Jon F. Monsen Collection
Foxboro Flow And Valve Pocket Slide Rule PUB-19 (1962) (English Units) ISRM 24.05.21.	Foxboro Flow And Valve Pocket Slide Rule PUB-19 (1962) (English Units) Made in USA - This is constructed much like a slide chart, but with a cursor like a slide rule. Front Scale: Valve calculations Back Scale: Meter calculations Original owner: Jon Monsen Ph.D., P.E. (label on wallet with Seaport-Controls Business card). Gifted by Dan Robertson. Belonged to the Jon F. Monsen Collection 1962 English Units manual
Foxboro Flow And Valve Pocket Slide Rule PUB-34 (1963) (Metric Units) ISRM 24.05.29.	Foxboro Flow And Valve Pocket Slide Rule PUB-34 (1962) (Metric Units) Made in USA - This is constructed much like a slide chart, but with a cursor like a slide rule. Front Scale: Valve calculations Back Scale: Meter calculations Gifted by Dan Robertson. Belonged to the Jon F. Monsen Collection 1963 Metric Units manual
Foxboro Flow And Valve Rule (White slide) ISRM 24.05.05.22	Foxboro Flow And Valve Rule (White slide) c1967 Made in Japan by Hemmi. Front Scale: (Flow Calculation) Back Scale: (Control Valve Reynolds Number: Gifted by Dan Robertson. Belonged to the Jon F. Monsen Collection
Foxboro Flow And Valve Rule (Green slide) ISRM 24.05.05.21	Foxboro Flow And Valve Rule (Green slide) c1968 Made in Japan by Hemmi. Front Scale: (Flow Calculation) Back Scale: (Control Valve Reynolds Number: Gifted by Dan Robertson. Belonged to the Jon F. Monsen Collection
Foxboro Flow And Valve Rule Form2183 (1971) ISRM 24.05.05.30	Foxboro Flow And Valve Rule Form2183 (1971) Made in USA - This is constructed much like a slide chart, but with a cursor like a slide rule. Front Scale: Valve calculations Back Scale: Meter calculations Gifted by Dan Robertson. Belonged to the Jon F. Monsen Collection 1971 English Units manual
Foxboro Flow Rule (Sterling Mfg.Co.) c1968 ISRM 24.07.04.44	Foxboro Flow Rule (Sterling Mfg.Co.) c1968 Made in USA by Sterling Manufacturing Co. Mainsfield, Mass. Based in South Lancaster, Mass., Sterling Manufacturing Company Inc. is a custom injection molder. Since its inception in 1968, the company has become a worldwide supplier of custom precision-molded thermoplastic components. Now owned by EPTAM Precision. Front Scale: (Liguids): D, Pipe Schedules [ Pitot, Flange, Pipe, Nozzle or Venturi, Liquids GL, Gf, Steam psi, H, Conversions ] E Back Slide: (Gas): [ Pitot, Flange, Pipe, Nozzle or Venturi, Gas Temp, Gas Specific Gravity, H (Differential ] E Well: Nomographs and Instructions Back: Instructions Gifted by Debbie Dilatush, Tom Dilatush Collection. Paradise, UT Tom Dilatush (1952-2024) Previously of San Diego, CA. Paradise, Utah. After graduating high school and attending college at Clemson University, Tom joined the US Navy in 1972 and served on the USS Long Beach, the first nuclear ship, until 1977. Practicing software engineer ex-executive. Tom was an active member of the Oughtred Society. Since 2006, he contributed scans of slide rules to ISRM to help fill the galleries. Tom enjoyed collecting computing devices and documenting them on his website hosted by ISRM.

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 Scientific_Instruments Variable Scale Model TP007200B ISRM 24.07.04.44

Gerber Scientific_Instruments Variable Scale - Type TP007200B Made in USA - Gerber Scientific Instrument Company Scales (47 cm): RI, RF Gift of Debbie Dilatush, Tom Dilatuysh Collection, Paradise, Utah. 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 Variable Scale Model TP007100B ISRM 20.08.24.01

Gerber Variable Scale - Type TP007100B Made in USA - Gerber Scientific Instrument Company Note: One set screw was replaced in this model by a nylon hex screw, possibly making it easier to adjust the friction. 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.

Gerber GraphAnalogue Model GA-103 ISRM 16.05.10.01

Gerber GraphAnalogue GA-103 Made in USA - Gerber Scientific Instrument Company Scales: RI, RF, RC,I, F, CM, T, T, S(Sin)C(Cos), D(Degree Scale), ()2, ()2,()1/2,()1/3, L10, Le, Le, P Notes: The heart of the Variable Scale is a high precision triangular spring whose coils act as calibrating lines. When extended, all coils are equally spaced. A second spring carries numerical markings for each 10th coil of the triangular spring. Donated by Marie Sayre Cole of Wappingers Falls, NY, Daughter of C.L. Sayre Jr. Clifford L. Sayre, Jr. 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	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: 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®

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

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] [SI - Silicon] [NSI - Nickel] [CSR - Chromium] [MSO Molybdenum] [V - Vanadium] [Grain Size] [blank] [For Percentages, For Multiplication] Ideal Critical Diameter, Jominy Distance] Slide Chart: The End-Quench Hardenability Curve Chart and Instructions. Back adv:USS Carilloy Alloy Steels.. Belonged to Thomas C. Graham, Sr. Gift of Thomas C. Graham,Jr. President and CEO of Hotwork-USA. This specialized slide rule belonged to Thomas C. Graham Sr. who is widely known as one of the steel industry's most successful and innovative executives. A former draftsman and civil engineer, he was named president of Jones & Laughlin Steel Corp. in 1974. In 10 years, he took the company through a merger with Youngstown Sheet & Tube Co., and then an acquisition of Crucible Steel's Midland plant. He departed J&L in 1983 to restructure the United States Steel Corporation, where he served as president of the U. S. Steel Group of USX Corp. until 1991. Over that period, finished products went from 8 man-hours per ton down to 4 man-hours per ton, contributing to a dramatic swing in profitability for the company. Graham had similar results as chairman and CEO of Washington Steel Co. (1991-1992). From 1992 to 1994, Graham Sr. was president and CEO of Armco Steel Co. L.P., predecessor of AK Steel. He was the founder and served as chairman and chief executive officer of AK Steel Corp. (1994-1995), and remained as chairman until his retirement in 1997. After his arrival at Armco Steel in 1992, the company went from being the least profitable U.S. steel company to earning the most profit per ton, and producing steel with the fewest man-hours per ton, of any of its major competitors over the following five years. He is now with TC Graham Associates as a founding member.Mr. Graham is a Korean war veteran.
General Motors Truck Performance Calculator ISRM 19.10.26.02 (Note: tagged as 19.10.27.02)	General Motors Truck Performance Calculator - 1946 Made in USA by Graphic Calculator Co. Note: Riveted cardboard construction Front Scale (Nested slides) Engine Rev per minute,Loaded Rolling Radius, % Grade on Concrete [ A Gear Ratio, C Indirect Gear, [ Speed in MPH, Torque in Lbs Ft, ] B Gross Vehicle Weight lbs ] Rim Pull-in lbs direct gear, Indirect Gear) Back scale: D [ E Dirt, Rough Dirt, Worn Gravel,Good gravel, Concrete (Road resistance) Back adv:General Motors Overseas Operations, New York. Gift of Philip Rodley of Upperhutt, New Zealand
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 REF P212	Concrete Volume Computer 1995 - 8 inch long Made in USA by Graphic Calculator Co for Louis Gerson Co, Middleboro, MA 02346 Front Scale: A(Thickness) [ B(Width), C(Length) ] D(Cubic Yards), E(Dia-Inches) Back Scale: Estimates for cubic yard Back adv: Lyman-Richey Sand & Gravel, Omaha, NB 68131
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

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 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

Guedon Metal pocket (1943) ISRM 12.06.27.01	Guedon Metal pocket Made in USA Camden, NJ - all sheet metal construction Front Scale: A [ B, CI, C ] D Front Scale: Conversions Back: 5in(fractions) 125mm Donated by Scott Reynolds of Vintage Calculators, Inc, California. In the MIT Museum, an internal letter dated January 20th, 1943 and signed A.W. Keuffel, the letter reads: "Herewith a Slide Rule known as a Vest Pocket Slide Rule made by Guedon, Camden, New Jersey. I do not think they will have much success selling this rule, because of the inherent disadvantages this metal rules has over our regular Pocket Slide Rule. Nevertheless, at the wholesale price of $.50. I do not see how they are able to make this article. After you have examined it, turn it over to Mr. Schneider for filing with the samples." Another of these was donated by David Hecht, Alexandria, VA and ISRM, in turn,gifted this to the Smithsonian Institute in Washington, DC. upon request.
Guedon Metal pocket Version 2 scales (1943) ISRM 20.04.01.249	Guedon Metal pocket Version 2 Made in USA Camden, NJ - all sheet metal construction Front Scale: A [ B, CI, C ] D Front Scale: Conversions Back: 5in(fractions) 125mm Gift of Philip Stanley Collection.
Guedon Metal pocket Version 3 scales (1943) ISRM 22.07.06.148	Guedon Metal pocket Version 3 Made in USA Camden, NJ - all sheet metal construction. Thin sheet plastic cursor. Front Scale: A [ B, CI, C ] D Front Scale: Conversions Back: 5in(fractions) 125mm Gift of Philip Stanley Collection.
Guedon 448 Pocket (Thin Film Cursor) - S.G.D.G. MARC ISRM 13.09.16.02	Guedon 448 Pocket (Thin Film Cursor) - S.G.D.G. MARC Made in France (Unis standard) for Guedon, 418 Schenectady (SCNDY) St., Schenectady (SCNDY), N.Y. Front Scale: 5in // A [ B, C ] D Back: Blank
Guedon - S.G.D.G. MARC License ISRM 22.04.29.01	Guedon - S.G.D.G. MARC License Made in France (Unis) for Guedon, Schenectady N.Y. Note: Po Box 853 Front Scale: 5in // A [ B, C ] D Back: 13cm Back Promo: Spaulding Fibre Company
Guedon - S.G.D.G. MARC License ISRM 14.07.02.94	Guedon - S.G.D.G. MARC License Made in France (Unis) for Guedon, Schenectady N.Y. Note: Po Box 223 Front Scale: 5in // A [ B, C ] D Back: 13cm Well: Builders Iron Foundry Ad Gift of Ed Millis, Dallas, Texas.
Guedon "The Miniature" Vest Pocket Slide Rule (1943) ISRM 20.04.01.256	Guedon "The Miniature" Vest Pocket Slide Rule Made in France for Guedon, Camden, NJ. Front Scale: 4.5 inch // A [ B, C ] D Back: 14 cm Gift of Philip Stanley Collection.
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

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 Herbert, 483 5th Avenue, New York, NY (1938)

Hyde Optical Slide Rule (c1939) Photography ISRM 22.04.08.03

Hyde Optical Slide Rule (c1939) Photography Made in USA by P.A.S. Co. NY, for Henry Herbert Distibutor. Note 0.010in thick Stainless Steel. Sold for $1.50 in 1939 See Radio and Television Ad. Front Scale: Focal Length inches, Relative Hyperfocal Distance [ 6in, Apertures in f stops, Diameters Enlargement, Hyperfocal Distances, 15.2cm ] Object Distance ft. Back::Instructions Back Slide: Equivalents Gift Of Penelope Anne Martell of San Jose, California. Belonged to her grandfather Milo Higgs Weston, Milo Higgs Weston, Born in 2 Oct 1882 and died in 19 Nov 1964 Oakland, California. Worked as a Mechanical Engineer for the Southern Pacific Company, Penelope included some old photos from the 1920's with the bio. The San Francisco Public Library has a collection of color slide by Milo and his daughter Clara M. Weston Martell (b.1918 d.2001, Penelope's Mother, Father:Gerald Martell) from 1939-1940. Son William H Weston (b1921). other Daughter Charlotte E Weston (c1923). California San Francisco Public Library Collection

Human Factors Research, Inc.
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

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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.

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

• 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 Mannheim Type Slide Rule
1938 and 1943 Kit Comparisons as packaged
with the book Speed and Fun with Figures

The lower left corner of the envelope is marked: Designed by Jack W. Dunlap and Albert K. Kurtz. The lower right corner is marked: Copyright 1933 by The Psychological Corporation. James McKeen Cattell, Robert Sessions Woodworth, and Edward Lee Thorndike founded the Psychological Corporation in New York City in 1921 to market psychological tests and educational materials. Jack W. Dunlap (1902-1977) and Albert Kenneth Kurtz (1904-1992) were academic psychologists interested in graphic computation charts. They copyrighted the D-K Statistical Slide Rule again in 1938, after which it was sold as a duplex wooden rule. After World War II (citation needed)., Dunlap went into industrial psychology. National Museum of American History Collection

Minnisota Personality Scale (For Men), U.S. Central Intelligence Agency (CIA) test - Copyright 1941 by The Psychological Corporation, PDF.

Dr. A. Edwin Harper, Jr.(1919-2001) an eminent American psychometrician who worked for the United Presbyterian Church of the USA since 1948. He was born in Lahore, India, the son of a Presbyterian missionary. He was sent to the U.S.A. for his higher education. His BA was from Princeton University in 1941, Masters from Iowas State in 1943 and PhD from Columbia University in 1948. He spent his entire working career in India. He was head of Phsycology and Education and Research at Edwin Christian College. From 1967 he was developing a testing and guidance program for the schools of the North India Synod. His wife also served as a missionary for the Presbyterian Church U.S.A. Dr A Edwin Harper, Jr and Dr VS Misra, were coauthors in their book Research on Examination in India, was published by the National Council of Educational Research and Training (NCERT).

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)

When determining if a thin film sheet plastic slide rule is made by Graphic Calculator, Gerson, Parisian Novelty, Whitehead-Hoag (W&H), etc, look for the cursor stop that prevents the cursor from falling off. This was a W&H feature. However the C-Thru No. 27 and 88 also had this feature. W&H predates C-Thru, so thru may have purchased the W&H toolinjg from Bastion Bros.