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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. The Festus Mfg. Co. and the Acu-Rule Mfg. Co. filled an important need during the Depression years of 1938 to 1940 and during WWII as a supplier of a low cost, student grade, wood slide rule as well as providing production capacity for
other brand names, such as Dietzgen and Frederick Post. In 1939 the company was renamed Acu-Rule Mfg. Co., producing slide rules branded as Acu-rule and Acumath. They later moved to
Saint Louis, Missouri. then moved to in Mt. Olive, Illinois in 1954. Acu-Math
became the standard brand of Acu-Rule, which was retained when merged later as the Acu-Math
Division of Sterling Plastics in Mountainside,
New Jersey in 1968. Acu-Rule Manufacturing was dissolved in 1969. Sterling was subsequently purchased and became a division of Borden Chemical Co. in 1970. Slide rules were produced up
until 1972.
Click here for more Acu-Rule
History researched by George Keane of Festus, Missouri, an associate of ISRM. |
 Festus Model 50 - Magnifying Cursor ISRM 18.07.11.13 |
Festus Model 50 - Magnifying - 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: blank Back: equivalents - Paper glued on wood Note: Predecessor to Acu-Rule 50, same stock, except paper scales Gifted by Phil Stanley of Worcster, Massachussettes
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 Festus Model 100 - Lucite Cursor S527 |
Festus Model 100 - 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: Predecessor to Acu-Rule 100, same stock, 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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 Festus (pre-Acu-Rule 100) ISRM 18.09.17.38 |
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 Gift of Donald Bachelor S. Bachelor Collection |
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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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 Acu-Rule No.10-D Magnifying Cursor Student Slide Rule ISRM 14.07.02.54 
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Acu-Rule No.10-D Magnifying Cursor - Student Slide Rule c1938 Made in USA by Festus Mfg. Note: "Acu-Rule" not present on stock. White painted with black scales. 1938 Catalog description: A 10 inch white faced slide rule with "Lucite" Magnifying indicator. Has A, B, C, D, CI and K scales. In cardboard case. MODEL 10-D...35c EACH Front Scale 10inch // A [ B, CI, C ] D, K Back Slide (need to flip over and use with C scale): [ S, L, T ] Back: 25 Cm, Conversion Chart Gift Of Ed Millis, Dallas, Texas. 
Original Owner (marked in well): Christine Whitmore, home: 36 S. Denny St., Indianapolis, IN Phone: FL 7-7912. This is the home where Christine, a student, used this slide rule for her homework. Its a duplex home #36 is on the right. |
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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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 Acu-Rule Model 50 ISRM 14.07.02.98 |
Acu-Rule 50 c1939 Made in USA by Festus Mfg. Note: "Acu-Rule" on left of wood stock. White painted with black scales. 1938 Catalog description: A 10 inch white faced slide rule in brown leatherette case. Has a flat "Lucite" indicator. In addition to the A, B, C, D, CI and K scales it has a metric and English linear scale. MODEL 50 ......50c EACH Front Scale 10inch // A [ B, CI, C ] D, K Back Scale: 25 Cm [ S, L, T ] Back: Conversion Chart Gift Of Ed Millis, Dallas, Texas. |
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 Acu-Rule Universal ISRM 14.07.02.49 |
Acu-Rule Universal c1940 Made in USA by Acu-Rule MFg. Co, Formerly Festus Mfg. Note: no "Acu-Rule" on stock. Intended for rebranding to OEMs. Laminated scales with double bevel. Identical to Frederick Post 1452-D Universal. Front Scale: 10inch // A [ B, CI, C ] D, K \\ 25cm Back Scale: [ S, L, T ] Back: Equivalents, Fraction to decimal. Gift Of Ed Millis, Dallas, Texas. 
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 S050 Acu-Rule 100 |
Acu-Rule 100 - Wood - c1939 Made in USA by Festus Mfg. Front Scale 10 Inch // A [ B, CI, C ] D, K Back Scale: 25 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 No. 4 White 
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Acu-math No. 4 White 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 
 1965 Ad, Plastic Clamshell Case Logo |
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Acu-math No. 4T Sight Saver Yellow Specimen Needed |
Acu-math 4T Sight Saver Yellow c1965 Made in USA - Note: Stock is only 28mm wide - Magnifying cursor Front Scale K, A [ B, CI, C ] D, L Back Scale: Blank
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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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Acu-math Pocket Duplex Mannheim 1949-1952 Made in USA by AcuDesign. Based on W.J. Boos U.S. Patent 2,594,857 - Apr 29, 1952 Note: All Vinyl Stock, otherwise identical appearance and construction as Charvoz-Roos PSR-101 which has a celluloid laminated wood stock. Has fixed rear hairline for trig scales. Front Scale: A [ B, CI, C ] D, K Back Scale: Equivalents [ S, L, T ] Equivalents Donated by Daniel Swerdlow, Bethesda, Maryland Daniel Swerdlow is a second-generation engineer from New York City and has degrees in electrical engineering from New York University and Michigan State University. He has done telecommunications engineering for major corporations and currently lives in the Washington, DC area and works at the United States Patent and Trademark Office. Dan has gifted most of his collection to ISRM to support the museum. Many specimens may be found in the various ISRM galleries. |
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 Acu-Math No. A-51 Duplex Mannheim (Boos Patent) ISRM 13.07.03.04 |
Acu-math No. A-51 Duplex Mannheim 1949-1952 Made in USA by AcuDesign. Based on W.J. Boos U.S. Patent 2,594,857 - Apr 29, 1952 Note: Magnesium and Vinyl Stock with finger pockets in slide. Similar to wood version of Charvos Roos 105D. Has fixed rear hairline for trig scales. Front Scale: A [ B, CI, C ] D, K Back Scale: Equivalents [ S, L, T ] Equivalents Original owner's initials on stock: 'L.H.' Donated by Daniel Swerdlow, Bethesda, Maryland |
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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) Note: Early Vinyl clad 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) Note: Early Vinyl clad 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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 Acu-math 90A Mannheim Trig ISRM 13.06.25.02 |
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 Gifted by Norma Tanner of Libertyville, Illinois |
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 Acu-math 130 Log Log Decimal Trig ISRM 11.11.17.07 |
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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 Acu-math 150 Log Log Decimal Trig ISRM 11.11.17.06 |
Acu-math 150 - 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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 Acu-math 150 Log Log Decimal Trig ISRM 15.05.12.01 
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Acu-math 150 - Log Log Decimal Trig, Black substrate - pre 1968 Made in USA by Acumath - no logo Note: Black substrate between the outer laminations Front Scale LL01, K, A [ B, T, ST, S ] D, L, LL1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 Gift Of Don DiGalbo Collection 
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 S168 Acu-math 150 Log Log Decimal Trig |
Acu-math 150 - 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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 Acumath 400 Mannheim ISRM 11.11.17.04 |
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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 Acu-math 400 ISRM 11.02.14.01 |
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.  Packaging gift of Ed Millis, Dallas, Texas. |
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 Acu-math 400 ISRM 13.06.25.04
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Acu-math 400 - Simplex Trig - c1968 Made in USA by Sterling Plastics - note round corners, wrap over cursor - Oval Logo Front Scale S, K, A [ B, CI, C ] D, L, T Back Blank Gifted by Norma Tanner of Libertyville, Illinois Norma has been a participant of the ISRM Slide Rule Loaner Program. In addition, she had her own collection that she loaned out to students. This one is part of the collection sent to ISRM. Norma writes: "After teaching math and/or science for 24 years, I am now enjoying retired life. Having been educated at MIchigan State University during a time when using a slide rule was the only technology available for advanced calculations, I decided to create a unit of study for my students that would introduce them to the slide rule. My goals were for students to strengthen their ability to estimate and use scientific notation, as well as to discover the historic significance of the slide rule. While it was hard for them to put aside their electronic calculators, they were fascinated, engaged, and thrilled when they could multiply 2 x 3 and actually get 6 instead of 5.9. In the end my students were happy to be reunited with their calculators, but had a new appreciation for the value of estimating, scientific notation, and accuracy in measurement. Goals met! " |
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 Acu-math 400 (wide Stock) ISRM 16.06.21.01 |
Acu-math 400 - Simplex Trig - c1968 Made in USA by Sterling Plastics - wide stock, square corners, wrap over cursor - Oval Logo Front Scale S, K, A [ B, CI, C ] D, L, T Back Blank Gifted by Wes Boyce of Fairport, New York Wes writes: "I was cleaning out boxes in the basement and found my old slide rule. I used it in high school physics in 1968-1969. I had trouble just throwing it away and decided to search the internet for something to do with it. I found your website [ISRM]. I hope it can find some use." |
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 Acu-math 400B ISRM 13.06.25.14 |
Acu-math 400B - Simplex Trig - c1965 Made in USA - Oval Logo, Narrow Stock, Rounded Braces, Wrap Over Cursor Front Scale S, K, A [ B, CI, C ] D, L, T Back Scale Conversion Table [Fraction=Decimal] Trig properties Gifted by Norma Tanner of Libertyville, Illinois |
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 Acu-math 400B (wide Stock) ISRM 13.06.25.13 |
Acu-math 400B - Simplex Trig - c1968 Made in USA - Oval Logo, Wide Stock, Square Braces, Wrap Over Cursor Front Scale S, K, A [ B, CI, C ] D, L, T Back Scale Conversion Table [Fraction=Decimal] Trig properties Gifted by Norma Tanner of Libertyville, Illinois |
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 Acu-math 401 Student Mannheim Trig ISRM 15.01.05.01 |
Acu-math 401 Student Mannheim Trig Made in USA - Oval Logo, Narrow Stock, rounded Braces, Wrap Over Cursor Front Scale K, A [ B, T Cot, ST, S Cos, C ] D, DI Back: Blank Gifted by George Keene, Festus, Missouri. |
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 Acu-math 500 ISRM 11.11.17.05 |
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] Conversion Table |
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 Acu-math 500 Trig ISRM 14.07.02.50 |
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 Gifted by Ed Millis, Dallas, Texas. |
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 Acu-math 500 Trig (Variation) ISRM 16.06.02.03 These students (Jim Cannon and Cindy) loved each other and used their slide rule sleeve to advertise it to the world. Evidently, other family members shared the slide rule as Bobby Cannon and Tony Cannon wrote their names on the sleeves as well. They went to the all-boys St. Mel High School in Chicago, Illinois. |
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 Gifted by Bob Schwarz, Temple, Texas.  |
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 Acu-math 500 (Square Braces) ISRM 12.06.24.65 |
Acu-math 500 - Square Braces - c1968 Made in USA - Note: Braces made of thin folded sheet metal Front Scale S, K, A [ B, CI, C ] D, L, T Back Scale Conversion Table [Fraction=Decimal] Trig properties Gift of Huang Collection |
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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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 Acu-Math 511 Mannheim Professional ISRM 13.06.25.01 |
Acu-Math 511 Mannheim Professional 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 Gifted by Norma Tanner of Libertyville, Illinois  |
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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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 Acu-math 600 Basic Trig ISRM 14.07.02.53 |
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 Original owner (Written in sleeve): Chareles Middleton, "Don't steal Me! My owner is flinking chemistry". Southeaster, Texas A&M. Gift of Ed Millis, Dallas, Texas. 
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 Acu-math 600 Basic Trig ISRM |
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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 Acu-math 600 Basic Trig Yellow Stock REF |
Acu-math 600 Basic Trig Yellow Stock - c1959 Note: double end plates- Duplex 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 Archive - Herman van Herwijnen's Slide Rule Catalogue at ISRM. |
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  Fullerton-Acu 600 Basic Trig ISRM 12.06.24.31 |
Fullerton-Acumath 600 Basic Trig - 1959 note: double end plates- duplex cursor - flat edge plastic stock Made in USA by Acumath for Fullerton - Oval Acumath Logo Front Scale S, S&T, K, A [ B, CI, C ] D, L, T Back Scale Conversion Table [Fraction=Decimal] Trig properties
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 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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 Acu-math 900 Professional Mannheim Trig ISRM 14.07.02.51 |
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. Gift of Ed Millis, Dallas, Texas. 
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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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 Acu-math 1200 ISRM |
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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 Acu-math 1200 ISRM 15.05.12.04 |
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 ] Gift Of Don DiGalbo Collection 
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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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Acu-Math 1211 Pocket - Pre Acu-Math LogoISRM 16.06.02.04 |
Acu-Math 1211 - Pocket duplex - c1965 Made in USA - Vinyl laminate on Magnesium Stock, Metal braces Front Scale K, A [ B, CI, C ] D, L Back Scale [ S, T ] Multi-lined cursor Gifted by Bob Schwartz, temple, Texas. |
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Acu-Math 1211 Student Mannheim 5 inch Pocket Duplex - c1955 Made in USA by Acu-Rule Mfg. Co. Box 142, Mt. Olive, Illinois Note: Oval logo, Magnesium and Vinyl stock, Engraved, Metal Braces Front Scale: K, A [ B, CI, C ] D, L Back Scale: [ S, T ] Multi-lined cursor Back advertisementAnderson-Crane Company, Minneapolis, Minn. Note: Retail box with 44P instruction booklet. Gifted by Maureen White of Minneapolis, Minnissota, neice of Phillip Murray This slide rule, was owned and used by Phillip C. Murray (1920-2008) in his career. Phil attended Culver Military Academy in Indiana then received his degree in engineering from Purdue University, class of 1942 (Phi Delta Theta). He served in the U.S. Army from 1942-1946 and later employed by Pillsbury as a mechanical engineer. He traveled around the world helping to set up operational facitlies for the company. Phil was a lifelong member of Purdue's Phi Delt and was a significant donor and loyal supporter of their annual fund and educational foundation for many years. Phil was a gifted storyteller, avid bowler and spent his later years volunteering for Habitat for Humanity. |
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 Acu-Math 1240 (Black Braces, no Logo) ISRM 11.11.06.02 |
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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 Acu-Math 1240 (White Braces, no Logo) ISRM 15.05.12.03 |
Acu-Math 1240 - c1965 Made in USA Front Scale K, A [ B, CI, C ] D, L Back Scale: None Gift Of Don DiGalbo Collection  In Retail Box w/sheath w/manual No44 |
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 Acu-Math 1240 (White Braces) ISRM |
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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 Acu-Math 1240 (White Braces, Red text on slide) ISRM 17.12.17.07 |
Acu-Math 1240 - c1968 Made in USA Front Scale K, A [ B, CI, C ] D, L Back Scale: None Gift Of James Pennell Collection |
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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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 Acu-math 1311 Log Log Decimal Trig ISRM 13.07.03.01 |
Acu-math 1311 - Duplex Log Log Decimal Trig Made in USA by Acu-Math.C1955 Note: Braces on both sides, Magnesium and Vinyl Stock 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 Gifted by Daniel Swerdlow of Bethesda, Maryland |
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 Acu-math 1311 Log Log Decimal Trig ISRM 14.07.02.52 |
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 Gifted by Ed Millis, Dallas, Texas.  Reference (S134) with more readable printing. |
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 Acu-Math 1500 Log Log Decimal Trig ISRM 15.04.17.02 
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Acu-Math 1500 Log Log Decimal Trig -c1965 Made in USA - marked with "U.S." (Government issue) Note rounded braces. Same scales as 1311 but no red inverse scale markings Front Scale LL01, K, A [ B, T, ST, S ] D, L, LL1 Back Scale LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2 Gifted by Jay Wright of Washington D.C. 
Jay Kelly Wright, who owned this slide rule (1 of 2), was born in Washington D.C. He used them while a student at Washington-Lee High School, Arlington, Virginia from 1959-1961. After graduation from Dartmouth College in 1965, he served in the United States Navy from 1965-1969. He attended Harvard Law School and is a lawyer in the Washington D.C. area.
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 S135 Acu-math 1500 |
Acu-math 1500 - Duplex Log Log Decimal Trig - c1968 Made in USA Note square braces. Same scales as 1311 but no red inverse scale markings 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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 Connecticut Spring Corp Spring DesignISRM 05.03.10.01 |
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 |
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 Mid-Continent Spring Co. Spring Design Slide Rule ISRM 14.10.17.01 |
Mid-Continent Spring Co. Spring Design Slide Rule- c1950 Made by Acu-Rule for Mid-Continent Spring Co. St. Louis, Missouri. 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. 
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 Frederick Post 1452-D Universal c1945 ISRM 14.07.02.48 |
Frederick Post 1452-D Universal Made in U.S.A by Acu-Rule Mfg. Festus, Missouri. Front Scale: 10in // A [ B, CI, C ] D, K \\ 25cm Back Scale: [ S, L, T ] Back: Conversion/Geometry Chart Gift Of Ed Millis, Dallas, Texas. 
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 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) |
 This Demo slide rule is basically identical to the Laboratory Specialties Demonstration Slide Rule of 1939. shown in the sheet on the left. Laboratory Specialties sold Acu-Rule slide rules and Acu-Rule may have been commissioned to make this item. |
Acu-Rule (1939) and Acu-Math (1961) Catalog Spec sheets
2.27MB |
