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History: Acu-Rule, Acu-Math, (and later Sterling Plastics) slide
rules were made originally by Festus Mfg. Co., Festus, Missouri, in 1938 by Paul
Jones. In 1939 the company was renamed Acu-Rule Co., and later moved to
ST. Louis, Missouri. then moved to in Mt. Olive, Illinois in 1954. Acu-Math
became the standard brand which was retained when merged later as the Acu-Math
Division of Sterling Plastics in Mountainside,
New Jersey in 1968 and was purchased and produced by Borden Chemical Co. up
until the mid 1970's. Construction: After making wood slide rules since 1938 and dealing with the raw material shortages and allocations during World War II, the Acu-Rule Mfg. Co. was ready to develop new products. Magnesium core slide rules were produced in 1946 and then vinyl slide rules around 1948. After a few unsuccessful tries their final choice of a substrate was a material consisting of eight layers of a special, 0.015 inch thick, vinyl film laminated with an adhesive under heat and pressure made by the Bakelite Company of Ottawa, Illinois. It was sold in a 30 inch by 20 inch piece that was 0.12 inches thick.
Click here for more Acu-Rule
History researched by George Keane of Festus, Missouri, an associate of ISRM. |
 S527 Festus - Lucite Cursor |
Festus - Lucite Cursor - c1938 Made in USA by Festus Mfg, Festus, MO. - Paper on wood scales Front Scale 10in // A [ B, CI, C ] D, K || 25cm Back scale: [S, L, T ] Back: equivalents - Paper glued on wood Note: Same stock as Acu-Rule 100, except paper scales |
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 REF Acu-Rule 10-J |
Acu-rule 10-J - c1939 Made in USA by Festus Mfg in Festus, MO Front Scale A [ B, CI, C ] D, K Back Slider: Blank Back: Conversion Chart, 25cm Archive - Tom Dilatush Collection |
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 S343 Festus (pre-Acu-Rule 100) |
Festus (pre-Acu-Rule 100) Magnifying Cursor -
c1939 Made in USA by Festus Mfg., Festus, MO. Front Scale A [ B, CI, C ] D, K Back scale: 25cm [S, L, T ] 10in Back: equivalents Note: Same scales as Acu-Rule 100, except no beveled edge |
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 S289 Acu-Rule 10-D |
Acu-rule 10-D - Magnifier- c1938 Made in USA by Festus Mfg in Festus, MO Front Scale A [ B, CI, C ] D, K Back Slider: Blank Back: Conversion Chart |
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 P260 Acu-Rule 5-J Pocket |
Acu-Rule 5-J Pocket - Wood - c1940 Made in USA by Festus Mfg., Festus, MO. Front Scale A [ B, CI, C ] D, K Back Slider: Blank Back: 13Cm, 5 in Back Adv: Security Engineering Co. |
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 S050 Acu-Rule 100 |
Acu-Rule 100 - Wood - c1939 Made in USA by Festus Mfg. Front Scale Inch // A [ B, CI, C ] D, K Back Slider Cm [ S, L, T ] Back: Conversion Chart |
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 REF Acu-math AREL G-W Photo SR |
Acu-math AREL G-W Photo SR - 1946 Made in USA - Wood Stock, brass stiffener, Plastic Laminate, Molded cursor Front Scale F, WESTON, ASA [ Daylight, LIGHT, SKY TYPE, SUBJECT, FILTER, GAMMA] DEPTH of FOCUS Back: Film Speed Indexs Archive - George Keane Collection 
Instructions 3.31MB |
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 REF Acu-math_4 |
Acu-math 4 - c1965 Made in USA - Note: Stock is only 28mm wide - Magnifying cursor Front Scale K, A [ B, CI, C ] D, L Back Scale: Blank Archive - George Keane Collection 
Plastic Clamshell case logo |
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 P114 Acu-math 12 pocket |
Acu-math 12 - c1965 Made in USA - Note: This is the ONLY yellow Acu-Math I've seen Front Scale K, A [ B, CI, C ] D, L Back Scale [ S, T ] |
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 REF Acu-math A-60 Log Log Decimal Trig |
Acu-math A-60 Log Log Decimal Trig - c 1945 Made in USA by Acu Design (ST. Louis)- Early Magnesium with finger pocket Front Scale T, DF [ CF, CIF, CI, C ] D, S Cos, ST Back Scale LL0, LL00, A [ B, K, L, C ] LL3, LL2, LL1 Archive - Tom Dilatush Collection |
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 REF Acu-math A-80 |
Acu-math A-80 - c 1945 Made in USA by Acu Design (ST. Louis)- Early Magnesium with finger pocket Front Scale K, A [ B, S, T, C ] D, S, DI Back Scale: Note Folded scales Equivalents, [ L, C2, C1 ] D1, D2, D Archive - Tom Dilatush Collection |
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 S241 Acu-math 90 Mannheim |
Acu-math 90 Mannheim - c1945 Made in USA - Acu Design - Early Magnesium with finger pocket Front Scale T, DF, A [ CF, CIF, CI, C ] D, S, ST Back Scale Equivalents [ B, K, L, C ] Equivalents |
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 S469 Acu-math 90A Mannheim Trig |
Acu-math 90A Mannheim Trig - c 1945 Made in USA by Acu Design (ST. Louis)- Early Magnesium with finger pocket Front Scale T, DF [ CF, CIF, CI, C ] D, S Cos, ST Back Scale Equivalents, A [ B, K, L, C ] Equivalents |
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 ISRM Acu-math 130 Log Log Decimal Trig |
Acu-math 130 Log Log Decimal Trig - c 1945 Made in USA by Acu Design (ST. Louis)- Early Magnesium with finger pocket Front Scale LL0, LL00,A [ B, K, CI, C ] D, S Cos, ST Back Scale L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2 |
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 ISRM Acu-math 150 Duplex Log Log Decimal Trig |
Acu-math 150 - Duplex Log Log Decimal Trig - pre 1968 Made in USA by Acumath - no logo Front Scale LL01, K, A [ B, T, ST, S ] D, L, LL1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 |
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 S168 Acu-math 150 Duplex Log Log Decimal Trig |
Acu-math 150 - Duplex Log Log Decimal Trig - c1968 Made in USA b y Acumath - Oval Acumath Logo Front Scale LL01, K, A [ B, T, ST, S ] D, L, LL1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 |
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 ISRM Acumath 400 Mannheim |
Acumath 400 Mannheim - c1968 Made in USA - Grooved stock, Thin Cursor, No Logo Front Scale S, K, A [ B, CI, C ] D, L, T Back Blank |
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 ISRM Fullerton-Acu 400 |
Fullerton-Acu 400 - Simplex Trig - c1968 Made in USA - Wrap Over Cursor Front Scale S, K, A [ B, CI, C ] D, L, T Back Blank Original owner: (Markings on slide rule) Paul Cohen |
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 ISRM Fullerton-Acu 400 |
Fullerton-Acu 400 - Simplex Trig - c1968 Made in USA - Wrap Over Cursor Front Scale S, K, A [ B, CI, C ] D, L, T Back Blank Original owner: (Markings on slide rule) Frank Merhar Donated by the Huang Collection. |
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 ISRM Acu-math 400 |
Acu-math 400 - Simplex Trig - c1968 Made in USA - note round corners, no Logo Front Scale S, K, A [ B, CI, C ] D, L, T Back Blank Donated by William (Bill) Mulroy who used this in High School in Italy where his dad was stationed in 1965. Bill joined the US Army and served in Vietnam. He later owned a concrete contracting company in Colorado. |
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 ISRM Acu-math 400 |
Acu-math 400 - Simplex Trig - c1968 Made in USA - note round corners, wrap over cursor - Oval Logo Front Scale S, K, A [ B, CI, C ] D, L, T Back Blank |
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 ISRM Acu-math 400 |
Acu-math 400 - Simplex Trig - c1968 Made in USA - wide stock, square corners, wrap over cursor - Oval Logo Front Scale S, K, A [ B, CI, C ] D, L, T Back Blank |
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 ISRM Acu-math 400B |
Acu-math 400B - Simplex Trig - c1965 Made in USA - Oval Logo Front Scale S, K, A [ B, CI, C ] D, L, T Back Scale Conversion Table [Fraction=Decimal] Trig properties |
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 ISRM Acu-math 500 |
Acu-math 500 - Simplex Trig - 1960 Made in USA by Acumath - No Logo Front Scale S, K, A [ B, CI, C ] D, L, T Back Scale Conversion Table [Fraction=Decimal] Trig properties |
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 S139 Acu-math 500 |
Acu-math 500 - Simplex Trig - 1960 Made in USA by Acumath - Oval Logo Front Scale S, K, A [ B, CI, C ] D, L, T Back Scale Conversion Table [Fraction=Decimal] Trig properties |
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 S137 Acu-math 500 |
Acu-math 500 - Simplex Trig - c1968 Made in USA Front Scale S, K, A [ B, CI, C ] D, L, T Back Scale Conversion Table [Fraction=Decimal] Trig properties |
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 S447 Acu-math 511 Student Mannheim |
Acu-math 511 Student Mannheim -c 1945 Made in USA - Early Magnesium with finger pocket Front Scale S, K, A [ B, CI, C ] D, L, T Back Scale Conversion Table [Fraction=Decimal] Trig properties |
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 REF Acu-Math 511 Professional Mannheim |
Acu-Math 511 Professional Mannheim c1960 Made in USA - Note: Stock/Slide has a plastic laminate over alloy substrate. Front Scale S, K, A [ B, CI, C ] D, L, T Back Scale Conversion Table [Fraction=Decimal] Trig properties Archive - Now in Duncan MacKellar collection  |
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 S224 Acu-Math 511 Professional Mannheim |
Acu-Math 511 Professional Mannheim - c1955 Made in USA - Note: this has a painted all-metal stock and a single sided cursor to reduce manufacturing cost. The cursor is retained by grooves on the stock. Front Scale S, K, A [ B, CI, C ] D, L, T Back Scale Conversion Table [Fraction=Decimal] Trig properties |
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 REF Acu-math 550 |
Acu-math 550 - Professional Mannheim Trig -c1960 Made in USA by Acu-Rule Front Scale K, A [ B, T Cot, ST, S Cos] D, DI, L Back Scale Conversions, DF [ CF, CIF, CI, C ] D, Conversions, con't. Archive - Tom Dilatush Collection |
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 S427 Acu-math 600 Basic Trig |
Acu-math 600 Basic Trig - c1955 Made in USA Front Scale S, S&T, K, A [ B, CI, C ] D, L, T Back Scale Conversion Table [Fraction=Decimal] Trig properties |
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 S482 Acu-math 600 Basic Trig |
Acu-math 600 Basic Trig - 1955 note: double end plates- simplex cursor - all plastic stock Made in USA by Acumath - No Acumath Logo Front Scale S, S&T, K, A [ B, CI, C ] D, L, T Back Scale Conversion Table [Fraction=Decimal] Trig properties |
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 ISRM Acu-math 600 Basic Trig |
Acu-math 600 Basic Trig - 1955 note: double end plates- simplex cursor - grooved edge plastic stock (needed for one-sided cursor) Made in USA by Acumath - Oval Acumath Logo Front Scale S, S&T, K, A [ B, CI, C ] D, L, T Back Scale Conversion Table [Fraction=Decimal] Trig properties |
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  ISRM Fullerton-Acu 600 Basic Trig ISRM 12.06.24.31 |
Fullerton-Acumath 600 Basic Trig - 1959 note: double end plates- duplex cursor - flat edge plastic stock Made in USA by Acumath for Fullerton - Oval Acumath Logo Front Scale S, S&T, K, A [ B, CI, C ] D, L, T Back Scale Conversion Table [Fraction=Decimal] Trig properties
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 S138 Acu-math 600 |
Acu-math 600 - Simplex Trig - c1968 Made in USA Front Scale K, A [ B, S, ST, CI, C ] D, L, T Back Scale Conversion Table [Fraction=Decimal] Trig properties |
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 S522 Acu-Rule MR700 Mu-Stick Chord/note transposition |
Acu-Rule MR700 Mu-Stick - Key transposition - c1965 Made in USA - Distributed by Mel McSwain Co. Front Scale Original Key [ Transposed Key ] Diminished/Augmented Back: Blank |
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 S418 Acu-math 800 Accu-Line |
Acu-math 800 Accu-Line - c1968 Made in USA Front Scale LL01, K, A [ B, T Cot, ST, S Cos] D, DI, LL1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 Note: Adjustable cursor alignment |
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 S136 Acu-math 900 |
Acu-math 900 - Professional Mannheim Trig -c1955 Made in USA - Note: metal ends both sides Front Scale K, A [ B, T Cot, ST, S Cos] D, DI, L Back Scale Conversions, DF [ CF, CIF, CI, C ] D, Conversions, con't. |
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 S047 Acu-math 900 |
Acu-math 900 - Professional Mannheim Trig - c1960 Made in USA - Note metal ends only on one side Front Scale K, A [ B, T Cot, ST, S Cos] D, DI, L Back Scale Conversions, DF [ CF, CIF, CI, C ] D, Conversions, con't. |
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 ISRM Acu-math 1200 |
Acu-math 1200 - Pocket Simplex - c1965 Made in USA Front Scale K, A [ B, CI, C ] D, L Back Scale [ S, T ] |
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 P065 Acu-math 1200 |
Acu-math 1200 - Pocket Simplex - c1965 Made in USA - Note: Black End pieces, NIB Front Scale K, A [ B, CI, C ] D, L Back Scale [ S, T ] |
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 P005 Fullerton-Acu 1200 |
Fullerton-Acu 1200 - Pocket Simplex - c1965 Made in USA Front Scale K, A [ B, CI, C ] D, L Back Scale [ S, T ] |
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 P229 Acu-Math 1211 Pocket - Pre Acu-Math Logo |
Acu-Math 1211 - Pocket duplex - c1965 Made in USA - Plastic laminate on Magnesium Stock - Metal Ends Front Scale K, A [ B, CI, C ] D, L Back Scale [ S, T ] Multi-lined cursor |
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 ISRM Acu-Math 1211 |
Acu-Math 1211 - Pocket Simplex - c1955 Made in USA - Metal Ends Front Scale K, A [ B, CI, C ] D, L Back Scale [ S, T ] Multi-lined cursor |
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 ISRM Acu-Math 1240 (White Braces) |
Acu-Math 1240 - c1965 Made in USA Front Scale K, A [ B, CI, C ] D, L Back Scale: None Note: In red/clear plastic case w/ manual No44P |
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 ISRM Acu-Math 1240 (Black Braces) |
Acu-Math 1240 - c1965 Made in USA Front Scale K, A [ B, CI, C ] D, L Back Scale: None  In Retail Box w/sheath w/manual No44 |
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Fullerton-Acu 1240 - c1969 Made in USA by Acumath for: Fullerton Engineering Sales Co. Front Scale K, A [ B, CI, C ] D, L Back Scale: None Donated by Pamela Lanier Wolfe Browne, Kernersville, North Carolina This slide rule belonged to Pamela Lanier Wolfe Browne (1948 - ). In 1966, she began working as a secretary for the Onondaga County Department of Transportation, Division of Engineering, Syracuse, NY. She studied drafting in her spare time and on April 26, 1969 she took the Engineering Aid I civil examination. When she received her grade she was informed that she was the first woman in NY State to pass the exam and fill the position. On October 24, 1970 she passed the Engineering Aid II exam. She used this slide rule 1969-1971 while working on highway projects in the office. After much pleading with her boss, the Transportation Commissioner, he finally permitted her to work in the field with fellow male engineers conducting traffic counts. Note: Pamela is the widow of Harry Edson Browne (1933-2006). They were married in 1985. Harry Browne was an inspirational speaker who wrote 19 books that sold more than 2 million copies. In 1996 and 2000 he was the nominee of the Libertarian Party for President of the United States. |
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 S097 Acu-math 1300 |
Acu-math 1300 - Duplex Log Log Decimal Trig -c1960 Made in USA Front Scale LL01, K, A [ B, T Cot, ST, S Cos ] D, L, LL1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 |
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 S398 Acu-math 1311 Log Log Decimal Trig |
Acu-math 1311 - Duplex Log Log Decimal Trig -c1945 Made in USA - Note: Finger detents on slide Front Scale LL01, K, A [ B, T Cot, ST, S Cos ] D, L, LL1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 Early Magnesium Model - narrow cursor |
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 S375 Acu-math 1311 Log Log Decimal Trig |
Acu-math 1311 - Duplex Log Log Decimal Trig Made in USA - Note: Braces on both sides Front Scale LL01, K, A [ B, T Cot, ST, S Cos ] D, L, LL1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 Magnesium Model |
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 S134 Acu-math 1311 |
Acu-math 1311 - Duplex Log Log Decimal Trig-c1950 Made in USA - Note: Braces only on one side Front Scale LL01, K, A [ B, T Cot, ST, S Cos ] D, L, LL1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 |
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 S388 Acu-Math 1500 Log Log Decimal Trig |
Acu-Math 1500 Log Log Decimal Trig -c1961 Made in USA - has U.S. (military) Front Scale LL01, K, A [ B, T, ST, S ] D, L, LL1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 |
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 S135 Acu-math 1500 |
Acu-math 1500 - Duplex Log Log Decimal Trig - c1968 Made in USA Front Scale LL01, K, A [ B, T, ST, S ] D, L, LL1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 |
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 S400 Acu-math C.V. Ore - No. 1155
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Acu-math C.V. Ore - S-M No. 1155 Made in USA by Acu-Rule Co. for C.V. Ore, Harvey, Illinois - 1955 Front Scale: DS [ CI, C ] DM Back Scale: Blank See the Lawrence/Engineering Instruments gallery for the first wooden version. Mr. C. V. Ore of Harvey, Illinois describes his slide rule, which first sold for $1.50 in 1956, made by Engineering Instruments, as follows: "The S-M Slide Rule is a simplified, multi-purpose calculating instrument designed especially for the beginner. It contains the basic scales of professional slide rules ( C, D, CI ) as used by engineers for 80 to 90 percent of their work. And in addition to the basic scales the S-M Slide Rule has two special purpose scales for teaching the beginner the mechanics of the slide rule and to aid him in reading conventional C, D, and CI scales." |
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 S475 Connecticut Spring Corp Spring Design |
Connecticut Spring Corp Spring Design - c1945 Made by Acu-Rule for Connecticut Spring, Hartford, CT. Magnesium stock 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 |
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 S475 Connecticut Spring Corp Spring Design |
Connecticut Spring Corp Spring Design - c1955 Made by Acu-Rule for Connecticut Spring, Hartford, CT. All plastic stock 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 |
 S442 Dietzgen 1757 Primatrig |
Dietzgen 1757 Primatrig - c1955 Made in USA by Acu-Rule for Dietzgen - All Plastic Stock/slide, metal ends. Similar to (S427) Acu-Math 600 Basic Trig Front Scale L, K, A [ B, CI, C ] D, T Cot, ST, S Cos Rear Scale Trig Identities [ Decimal to Fractions ] Equivalents Same as S427 Acu-Math 600 Basic Trig (scales rearranged) |
Acu-Rule (1939) and Acu-Math (1961) Catalog Spec sheets
2.27MB
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