For Pocket Watch styles, visit the Pocket Watch Gallery
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From a 1988 speech by Seymour Cray (1925-1996),
father of the super-computer, In college I had a circular slide rule, the 10-inch model.
That's as big as circular slide rules were made, so I had the very top of the line. If you had a circular slide rule, you had some social problems in college. Almost everyone else had a straight-stick slide rule, and they came in a nice leather case with loops on the back so you could hang them on your belt. Those of us with circular slide rules couldn't do that, so people looked at you kind of funny and thought, `Do you suppose he's really not an engineer?'. |
For Pocket Watch styles, visit the Pocket Watch Gallery |
 REF - USSR_Artillery |
USSR_Ranging Made in USSR - 20cm dia, 6mm thick, all aluminum Front Scale Tg (elevation), Tg (Azimuth,) Distance, Range Archive - Not in collection |
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 REF - Alro_200R |
Alro_200R Made in Holland Front Scale S, T, S&T, N2, N ( N , N2, R, N3 Back Scale: Decimal/fraction, spiral scale
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 REF - Dempster RotaRule - model AA |
Dempster RotaRule - Model AA (1933-1948) Made in USA - Designed and manufactured by Jack Dempster, Berkeley, California. Front Scales: K, A, D ( C, CI, CIF, S, CS, ST, T, CT, G, B, F/i ) Back Scales: 1-100 in 4circles, DLL, V2 ( V1, 1-100 in 4circles, LL3, LL2, LL1, LL%, L ) Archive - Hermann's SR Catalog 
Model 1798 shown in 1938 Dietzgen Catalog (in ISRM Library) |
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 REF - Boykin RotaRule - model 510 |
Boykin RotaRule - Model 510 (1960-1973) Made in USA - Designed by Bernard C. Boykin,Ruxton, Maryland. Front Scales: K, A, D ( C, CI, CIF, S, CS, ST, T, CT, B, L ) Back Scales: D50:1-100 in 4 circles, DLL (V2, V1 C50:1-100 in 4 circles, LL3, LL2, LL1, LL01, LL02, L03 ) Archive - Various sources 
Note: Based on the Dempster's Rotarule design who's patent had expired,
but with improved scales. | ||
 REF - Huet MG 240C Circular |
Huet MG 240C Circular Made in France - 1925br> Front Scale (Long Spiral): Sines, Tangents, Metres Archive - Courtesy of Rod Lovette's Collection (UK) |
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 ISRM - C-Thru S-96 Slide Rule 6in dia |
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 |
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 ISRM - GE Space Propulsion |
GE Space Propulsion Calculator Made in USA - GE Flight propulsion Laboratory Front Scale: Beam Power, Thrust, Propellant consumption, Specific Impulse, Exhaust velocity Rear Scale: Planetary data and constants,  Instructions |
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 ISRM - Ground Water Hydrology Computer
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Ground Water Hydrology Computer - 4 coaxial disks 10mm thk Made in USA by Info, Inc Newton, MA (1967) for Layne Associates, Memphis, TN Front Scales - Transmissivity (T), Storativity (S), Time (t), Radius (r), factor (u), and Well Function of u [W(u)]. Back Scales - Well Function [W(u)], Transmissivity (T), Discharge (Q), Drawdown (s), and std. C, and D scales. Solves This Non-Equilibrium Equation for Ground Water: s = 114.6 Q W(u) / T; W(u) = e-u / u du; u = (1.87 r2 S) / (T t) Donated by the designer, N. Thomas Sheahan, Research Geologist, Layne Research Division, Memphis, TN Sheahan writes: "About 1,000 of the circular Ground Water Hydrology Calculator slide rules were produced... We had many of them printed with the names of the various associated Layne firms, but some were left blank to allow personalization. I continued to use this slide rule in the field and office from 1967 until the 1990s when I was finally able to get an HP-100LX, the first hand-held calculator that could solve this equation. Since then, I have had the slide rule as a wall decoration in my office until I retired this year (2008)". |
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 REF - Felsenthal PT-3 Aviation Computer |
Felsenthal PT-3 Aviation Computer Made in Chigao, IL (1970) Front Scale - Flight scales Back Scale - - Flight scales Archive - Scan donated by Bob Denny |
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 REF Weems-Plath Nautical Slide Rule |
Weems-Plath Nautical Slide Rule Made in USA by Weems & Plath, Annapolis, MD, 2002 Front Scale Distance Naut Miles, Yards (Speed, Time Min, Hrs ) Back: Instructions on use Owner: Mike Konshak's Personal instrument, used for USCG American Boating Course and Coastal Navigation traing. |
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 ISRM American Airlines Navagational Computer Type "B" |
American Airlines Navagational Computer Type "B" Made in USA by American Airlines, Inc. Serial Number B-11139, 1941, rev 1942 Front Scale: Distance Naut Miles, True Air Speed (Time Min, Hrs, Density Altitude, Air Temp ) Back Scale: Wind Correction Angle( True Heading ) Original Owner: Charles H. Eaton (1913 - 1982) used this slide rule from 1949-1972 as a professional pilot and aircraft engineer. He had his first airplane, a Curtis Junior, at 18 years old. Graduated in aeronautical engineering from California Polytechnic Institute in 1932. In the 1930s he flew for Paul Mantz Air Service, among others, and was a flight instructor in WW II, logging 2600 hrs teaching precision aerobatics. After the war he supervised conversion of military aircraft to civilian use, flew for American Airlines, Lockheed Aircraft, and Vinnell Corp, a world-wide heavy construction firm. In retirement he built two experimental airplanes. Donated by Prof. Robert C. Eaton, Univ of Colorado, in memory of his father. 
 12.1MB PDF |
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 ISRM Safetech E6-B Flight Computer Model FDF-60 |
Safetech E6-B Flight Computer Model FDF-60 Made in USA by Safetech, Newtown, PA, c1977-1986 Front Scale Distance Naut Miles, True Air Speed (Time Min, Hrs, Density Altitude, Air Temp ) Back Scale Wind Correction Angle( True Heading ) Slide: Sectional ands Wide Area Chart Scales Owner: Mike Konshak, Private Pilot with Instrument Rating 
 3.39MB PDF |
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 ISRM Air Force Type MB-2A Air Navigation Computer |
Air Force Type MB-2A Air Navigation Computer Made in USA by JB Carroll Co. Chicago, c1949-1956 4.25 inch Diameter, Patent USA 2,528,518 (1950) and 2,767,919 (1956) Front Scale Cal. Air Speed, True Air Speed, Temp Rise, Mach Number (Pressure Altitude, Indicated Air Temp ) Back Scale Course, Reative Wind ( wind , Corrected alt, Minutes, Hours, Wind, Drift, altitude ) Original Owner Stationed at Souix City Air Base, Iowa. Donated by Jason McHenry, Tucson, Arizona 
 5.91MB PDFIncludes insert on atomic bomb survival. |
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 ISRM Coasting Computer And Cross Drift Detector |
Coasting Computer And Cross Drift Detector Made in USA by American Hydromath Company -1944 for the U.S. Army Transportation Corps Two 6 inch diameter disks in leather case Disk 1: Pitch Speed Computer and Time-Distance-Speed Computer Knots or Miles, Pitch (RPM or Hours, Apparent Slip) Disk 2: Coasting Computer and Cross Drift Computer Distance Off (Run, First Angle, Second Angle) Donated by Lawrence Ferrier, Coleville, Washington 
 Instructions (1.34MB PDF)
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 ISRM T & T Fast Calculator |
T & T Fast Calculator Made in USA - 5-5/8" x 7" Front Scale - Wire Calculator: Wire Size (Amperes) System Index Back Scale - Motor Calculator: Load (Fuse Sizes) Donated by Marten C. Jensen  Instructions
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 REF - Helical Spring Design Computer |
Helical Spring Design Computer - 5 coaxial disks 10mm thk Made in England (1977) for Associated Spring Corp (ASC) Front Scale - Stress Calculator Load, Spring Index, Ratio of Sides, Mean Dia (Dia of Wire, No.Coils (Deflection, Correction Factor)) Back Scale - Rate, Load and Deflection Calculator Load, Spring Index, Ratio of Sides, Mean Dia (Dia of Wire, No.Coils (Stress, Modulas of Rigidity)) Archive - Scan donated by Jack Rababeh, Senior Engineer at ASC |
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 REF Military Attack Computer |
Military Attack Computer Made in USA Front Scale Air Speed, Lead angle, Time, Distance, etc. Archive - Not in collection |
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 REF - Standardgraph No. 910 Disco-Rietz |
Standardgraph No. 910 Disco-Rietz Made in West Germany c1960 - 12.8cm diameter Front Scale - L, CI, C ( D, Sin Cos, Tg Ctg, R) Archive - Scan donated by John Krijnen, Netherlands  |
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 REF - Gilson Binary 21.1cm dia. |
Gilson Binary Slide Rule 8in 21.1cm dia. Made in USA - Gilson Slide Rule Co., Stuart, Florida 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 Archive - Not in collection 
Equiv Manual 3.42Mb |
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 REF - Gilson Atlas (Square base) 20.5 cm dia |
Gilson Atlas (Square base) 20.5 cm dia. Made in USA by Gilson Front Scales C, S-Log, C (25 spirals), C-Log, Coils, Constants Back Scales Degrees, S, T, Degrees, S, T, Degrees, S, T, Fractions Archive - Courtesy of Rod Lovette's Collection (UK) |
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 REF - Gilson Atlas Type-3 21.1cm dia |
Gilson Atlas Type-3 21.1cm dia. Made in USA by Gilson Front Scales C, S-Log, C (25 spirals), C-Log, Coils, Constants Back Scales Degrees, S, T, Degrees, S, T, Degrees, S, T, Fractions Archive - Not in collection 
4.08MB
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 C21 Dietzgen 1797B (Gilson Binary) 21.1cm dia |
Dietzgen 1797B (Gilson Binary) 21.1cm dia. Made in USA by Gilson for Dietzgen 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 Original owner: Clarence Jackson Davis 1932-2004, Winchester, TN - Geologist, VP Marfac, Inc, Korean Veteran 
Manual 3.42Mb |
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 C39 Gilson Midget (1919) |
Gilson Midget (1919) - 9.9cm dia - 1919-1926 Made in USA - Gilson Slide Rule Co., Niles, Mi Scales front: C, CI, L, A, Binary, LL (Spiral), Fractions, Drill Scale (1/2 turn), Thread Scale (1/2 turn) Binary, Fraction,Drill,Thread, Millimeter Scales back: Sin/Cos, Degrees, Tan/Cot, Frac/Dec Equiv. Archive - Not in Collection |
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 REF Gilson Midget (1919) |
Gilson Midget (1919) - 9.9cm dia - 1919 Made in USA - Gilson Slide Rule Co., Niles, Mi Scales front: C, CI, L, A, Binary, LL (Spiral), Fractions, Drill Scale (1/2 turn), Thread Scale (1/2 turn) Binary, Fraction,Drill,Thread, Millimeter Scales back: Sin/Cos, Degrees, Tan/Cot, Frac/Dec Equiv. Scan contributed by Ronald Kuc |
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 REF Gilson Midget (1919) |
Gilson Midget (1919) - 9.9cm dia - 1927-1931 Made in USA - Gilson Slide Rule Co., Stuart, Florida Scales front: C, CI, L, A, Binary, LL (Spiral), Fractions, Drill Scale (1/2 turn), Thread Scale (1/2 turn) Binary, Fraction,Drill,Thread, Millimeter Scales back: Sin/Cos, Degrees, Tan/Cot, Frac/Dec Equiv. Archive - Ted White Collection  |
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 REF - Gilson Midget (1931, 1936) |
Gilson Midget (1931, 1936)- 10.2cm dia Made in USA - Gilson Slide Rule Co., Stuart, Florida OEM to Dietzgen (1797M), Pickett. Front Scales C,CI,A,K,Log,LL1,LL2,LL3,LL4, Back Scales Binary, Fraction,Drill,Thread, Millimeter Adv (on Case): JVG Archive - Not in collection |
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 C03 Dietzgen 1797M (Gilson Midget 1931, 1936) |
Dietzgen 1797M (Gilson Midget 1931, 1936)- 10.2cm dia Made in USA for Dietzgen by Gilson Slide Rule Co., Stuart, Florida Front Scales C,CI,A,K,Log,LL1,LL2,LL3,LL4, Back Scales Binary, Fraction,Drill,Thread, Millimeter 
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 C03 Dietzgen 1797M (Gilson Midget) |
Dietzgen 1797M (Gilson Midget)- 10.2cm dia Made in USA for Dietzgen by Gilson Slide Rule Co., Stuart, Florida Note: Copyright date removed from the previous artwork (circa 1960-70) Front Scales C,CI,A,K,Log,LL1,LL2,LL3,LL4, Back Scales Binary, Fraction,Drill,Thread, Millimeter Donated in 2008 by Bruce Chelf of Porter, Indiana 
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 REF - Pickett 101-C Dial Rule |
Pickett 101-C Dial Rule - 10.2cm dia Made in USA Front Scale: C, CI, A, AF, L, FA, LL2, LL1, DS, DT, M Back Scale C, S, ST, T, Fractions-Decimal Archive - Ted White Collection |
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 C05 Pickett 103-ES Mark-Up Calculator |
Pickett 103-ES Mark-Up Calculator - 10.2cm dia Made in USA Front Scale: C, CI, A, AF, L, FA, fraction-decimal Back Scale Quantity, Cost Basis, Selling Price (mark up) |
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 REF Pickett 104-C Profit Calculator |
Pickett 104-C Profit Calculator - 20.3cm dia Made in TBD Front Scales: % of Margin of Profit on Selling Price % of Profit Mark-Up from Cost Price [List Price] % of Discount from List Price Back: blank Archive - Ted White Collection |
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 REF Pickett 105-C Profit Calculator |
Pickett 105-C Profit Calculator - 9.9cm dia Made in TBD Front Scales: % of Margin of Profit on Selling Price % of Profit Mark-Up from Cost Price [List Price] % of Discount from List Price Back: blank Archive - Ted White Collection |
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 REF Pickett 106-C Proportional Scale |
Pickett 106-C Proportional Scale - 14.6cm dia Made in TBD Front Scales: Reproduction Size [Original Size] Percentage of Original Size Number of Times Reduced Back: blank Archive - Ted White Collection |
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 C14 Pickett 107-ES |
Pickett 107-ES - 8cm dia Made in Japan Front Scale: [ L, CI, C] D, A, K Back Scale: Equivalents |
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 REF Pickett 108-ES |
Pickett 108-ES - 8cm dia Made in Japan Front Scale: K, A, D [ C CI L ] Back Scale: D, T, S, T, S, T, TS Archive - Ted White Collection |
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 REF - Pickett 109-ES |
Pickett 109-ES - 10.8cm dia Made in Japan Front Scale : K, A, D, [ C, CI, EI(spiral)] Back Scale: L, DI, D, T, S, T, S, T, TS Archive - Ted White Collection |
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 REF Pickett 110-ES |
Pickett 110-ES - 12.8cm dia Made in Japan Front Scale : LL3, LL2, LL1, LL0, K, A, D [ C, CI, B, EI (spiral)] Back Scale: D(spiral), D, V2 [ V1, C(spiral), G, T, S, T, S, T, TS, L ] Archive - Ted White Collection |
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 REF Pickett 111-ES |
Pickett 111-ES - 12.8cm dia Made in Japan Front Scale: LL3, LL2, LL1, LL0, K, A, D [ C, CI, EI (spiral) ] Back Scale: /LL3, /LL2, /LL1, /LL0, L, DI, D, T, S, T, S, T, TS Archive - Ted White Collection |
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 REF Pickett 112C Metric Converter (4 base disks) |
Pickett 112C Metric Converter (4 disks) Made in USA - 15.2cm dia All with C&D scales, including conversions for: Orange Disk - Linear measure Maroon Disk - Dry measure Yellow Disk - Liquid measure Blue Disk - Weight measure Archive - Ted White Collection |
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 REF Aristo 0602 (1972) |
Aristo 0602 (1972) Made in Germany Front Scale A ( B, -50%/+100%(Mark-Up) ) Back: TBD Archive - Wenzel Collection |
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 REF Aristo 622 (1970) |
Aristo 622 (1970) Made in Germany Front Scale K, D, A,( B, CI ) Back: TBD Archive - Wenzel Collection |
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 REF Aristo Commerz 623 |
Aristo Commerz 623 Made in Germany Front Scale English-Metric Conversions, A( B, CI, -50%/+100%(Mark-Up) ) Back: TBD Archive - Wenzel Collection |
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 REF Faber-Castell 8/10 12.3cm dia |
Faber-Castell 8/10 12.3cm Dia Made in Germany Front Scale K, A, L, D ( C, CI, B, T1, T2, S, S ) Back: Instructions on Use Multilined Cursor: KW, (3)PS, (2)q Archive - Rod Lovett Collection |
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C06 Lietz 3625-20 8.4cm |
Lietz 3625-20 8.4cm Dia Made in Japan Front Scale D ( C, CI, A, K ) Back: equivalents |
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REF SIC 120 (Version 2) |
SIC 120 (Version 2) - 1962 Made in Japan for Scientific Instruments Co. - 10.8cm Dia Front Scale K, A, D ( C, CI, E1(spiral) ) Back Scale L, DI, D T, S, T, S, T, TS Archive - Ted White Collection |
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 REF Concise SIC 300B |
Concise SIC 300B - 1961 Made in Japan by Concise for SIC- 11.2cm Dia Front Scale K, A, D ( C, CI, B, L ) Back Scale LL3, LL2, D ( C, S Cos, T1 Cot1, T2 Cot2, ST Archive - Ted White Collection |
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C11 SIC 250 |
SIC 250 - Patent 440028 Made in Japan for Scientific Instruments Co. 1962 - 8cm Dia Front Scale K, A, D ( C, CI, L ) Back Scale D, T, S, T<45, S<45, T&S<5.8 |
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REF SIC 1610-D |
SIC 1610-D Made in Japan for Scientific Instruments Co., 1963 - 12.8cm Dia Front Scale LL3, LL2, LL1, LL0, K, A, D ( C, CI, B, EI(spiral) ) Back Scale LL03, LL02, LL01, LL00, P, L, DI, D ( C, T, S, T, S, T, TS ) Archive - Ted White Collection |
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 REF Star Sliding Disk 130 |
Star Sliding Disk 130 - 10.8cm dia Made in Japan Front Scale K, A, D, ( C, CI, EI (spiral)) Back Scale (Trig scales in Degrees-Minutes-Seconds) L, DI, D, T, S, T, S, T, TS Archive - Ted White Collection |
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 ISRM General Electric - Defense Electronics Division |
General Electric - Defense Electronics Division Made in USA - 2-1/2" x 4" Front Scale D ( C) Side Edges: CM and inches scale Donated by Marten C. Jensen |
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 C08_Otis Engineering Gas |
Otis Engineering Gas Calculator Made in Japan by Concise - 8.4cm Dia Front Scale D ( C, CI, A, K ) Back: Gas and Fluid weights |
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 C12 Pacemaker |
Pacemaker Made in Japan by Concise- 8.4cm Dia Front Scale D ( C, CI, A, K ) Back: Conversions |
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 ISRM Concise 28N Motorola Semiconductors |
Concise 28N Motorola Semiconductors Made in Japan by Concise - 8.4cm Dia Front Scale D ( C, CI, A, K ) Back: Conversions Donated by Marten C. Jensen |
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 C07 Concise 28 |
Concise 28 Made in Japan by Concise - 8.4cm Dia Front Scale D ( C, CI, A, K ) Back: Conversions |
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 REF Concise 28N |
Concise 28N Made in Japan by Concise - 8.4cm Dia Front Scale D ( C, CI, A, K ) Archive - Art Kautz Collection
Manual 1.67Mb |
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REF Concise 28N |
Concise 28N Made in Japan by Concise - 8.4cm Dia Front Scale D ( C, CI, A, K ) Archive - Art Kautz Collection
Manual 1.67Mb |
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 C27 Alpha 4028 (Concise 28) |
Alpha 4028 (Concise 28) Made in Japan by Concise - 8.4cm Dia Front Scale D ( C, CI, A, K ) Adv: Westeel-Rosco and Takeda 
Front 387Kb
Back 420Kb |
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 C32 Lafayette F-382 (Concise 270) |
 Lafayette F-382 (Concise 270) Made in Japan by Concise - 11.2cm Dia Front Scale L, D ( C, CI, A, K ) Back Scale DI, D ( S, T1, T2, ST ) |
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 C29 Concise 270N |
Concise 270N Made in Japan by Concise - 11.2cm Dia Front Scale A, D ( C, CI, B, K, L ) Back Scale DI, D ( S Cos, T1 Cot1, T2 Cot2, ST ) |
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 REF Concise 300 |
Concise 300 Made in Japan by Concise - 11.2cm Dia Front Scale K, A, D ( C, CI, B, L ) Back Scale LL3, LL2, D ( C, S Cos, T1 Cot1, T2 Cot2, ST ) Archive - Art Kautz Collection |
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 REF Concise Type-E Weights and Measures Conversion Tables Data Computer |
Concise Type-E Weights and Measures Conversion Tables Data Computer Made in Japan by Concise Front Scale: 4-3/8in || D ( C, CI, A, K) || 11cm Insert: Conversions for Flow, Pressure, Energy, Power, Volume, Velocity, etc. Scans donated by Kip Ryan  3.8MB PDF
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 C18 Concise Master Builders Type-E Data Computer |
Concise Master Builders Type-E Data Computer Made in Japan by Concise Front Scale: 4-3/8in || D ( C, CI, A, K) || 11cm Insert: Conversions for Flow, Pressure, Energy, Power, Volume, Velocity, etc. |
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 ISRM - Sama & Etani/Concise EE-112 Reactance Slide Rule |
Sama & Etani/Concise EE-112 Reactance Slide Rule - Copyright 1966 Made in Japan by Concise, Designed by Sama & Etani Groton, Massachusettes Front Scale: 4in || D ( C, CI, L, S Cos, T1 Cot1, T2 Cot2) || 10cm Back: Reactance Nomograph Insert: Conversions for Flow, Pressure, Energy, Power, Volume, Velocity, etc., Resistor Color Codes, Copper Resistance Donated by Jason A. McHenry, Tucson, Arizona 
Instruction Manual 1.67MB |
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 ISRM - Concise Science Tables and Slide Rule |
Concise Science Tables and Slide Rule - Copyright 1968 Made in Japan by Concise, Designed by Sama & Etani, Model 600 - Insert ST Front Scale: 4in || D ( C, CI, L, A, S, T, K) || 10cm Back: Periodic Table of the Elements, Temperature conversion Chart Insert: Conversions for Flow, Pressure, Energy, Power, Volume, Velocity, etc. Advertiser: Hooker Donated by Jeff Ilseman, Longmont, Colorado. 
Instruction Manual 4.5MB |
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 REF - Sama & Etani 600 Data Computer |
Sama & Etani 600 Data Computer - 1968, Insert CE Made in Japan by Concise - Reference Tables Front Scale: 4in || D ( C, CI, L, A, S, T, K) || 10cm Back: Periodic Table of the Elements, Temperature conversion Chart Insert: Conversions for Flow, Pressure, Energy, Power, Volume, Velocity, etc. Advertiser: Hooker Archive |
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 REF Concise 600ST Data Computer - Michael O'Leary Memorial |
Concise 600ST Data Computer - Michael O'Leary Memorial Made in Japan by Concise - design by Sama & Etani 1976 Special run for The International Slide Rule Group Front Scale: 4in || D ( C, CI, L, A, S, T, K) || 10cm Back: Periodic Table of the Elements, Temperature conversion Chart Insert: Conversions for Flow, Pressure, Energy, Power, Volume, Velocity, etc. Archive - Ted White Collection |
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 ISRM - Sama & Etani/Concise CTCS-552 Slide Rule |
Sama & Etani/Concise CTCS-552 Slide Rule - Copyright 1967 Recommended for chemical and mechanical engineers and chemists Made in Japan by Concise, Designed by Sama & Etani Groton, Massachusettes Front Scale: 4in || D ( C, CI, L, A, K) || 10cm Back: Table of the Elements Insert: Conversions for Flow, Pressure, Energy, Power, Volume, Velocity, etc. Donated by Jason A. McHenry, Tucson, Arizona 
Instruction Manual 830KB |
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 REF Sama Etana CTCS-552 Conversion Tables |
Sama Etana CTCS-552 Conversion Tables Made in Japan by Concise for Sama & Etani, Groton, Massachusettes Front Scale: 4in || D ( C, CI, L, A, K) || 10cm Back: Periodic Table of the Elements, Temperature conversion Chart Insert: Conversions for Flow, Pressure, Energy, Power, Volume, Velocity, etc.
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 REF US Army Signal Corps Psychrometric Calculator ML-322/UM |
US Army Signal Corps Psychrometric Calculator ML-322/UM Made in USA by Virginia Plak Company 1944 Front Scale: DP, VP, C2, C1, t' ( t-t', P, THETA) Back Scale: DP, VP, C2, C1, t' ( t-t', P, THETA)
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 REF Cox Stadia Computer |
Cox Stadia Computer Made in USA by Perrygraf - design by W. & L.E. Gurley Front Scale: Difference of Elevation, Horizontal Difference Archive - Not in Collection |
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 REF Hemmi 1001 Circular Slide Rule |
Hemmi 1001 Circular Slide Rule Made in Japan by Sun Hemmi Front Scale A, D( C, CI, B ) Back: TBD Archive - Not in Collection |
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 REF Norton & Gregory Roto-Rule 3.5" dia |
Norton & Gregory Roto-Rule - 3.5 inch dia Made in England - Norton & Gregory, London -Pat Feb-12-1907 Front Scale : A, C, D, L Archive - Not in Collection 
Instruction Sheet 121Kb |
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 C26 Multor Currency Exchange |
C26 Multor Currency Exchange Made in WestGermany - 3 color metal 8.8cm disk Front Scale D (C, A )
1.17Mb |
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 C28 Mascot Vest Pocket Slide Rule - 1934 |
Mascot Vest Pocket Slide Rule - 1934 Made in USA - 6.8cm Dia Front Scale: L, D ( C, CI ) Back Scale: S, A, K, T 
Front 579Kb
Back 850Kb |
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 REF - Circhlow Circular Slide Rule |
Circhlow Slide Rule 12in (25cm) Dia Cardboard disc - crude construction Front Scale A(1/sinA), B(1/cosA), C(Tan Cot), D(1/sin), E, F(Squares) Solutions of Triangles Per Brian Bourchers: This design was developed for the US Army coastal artillery in the pre WWII period. Notice that the outer scale goes to 6400 as there are 6400 mils in a circle under the military system. Archive - Not in Collection |
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 C22 Emeloid - Proportional Reproduction Size Finder |
Emeloid - Proportional Reproduction Size Finder Made by Emeloid Operations, Hillside, NJ 6in (15cm) Dia Plastic Film disc Front Scale Reproduction Size ( Size of Original) % of Original Size, # times reduced ) Donated by Jack Rababeh, Senior Engineer at ASC |
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 C23 Graphic - Percentage Calculator |
Graphic - Percentage Calculator Made by Graphic Calculator Co., Barrington, Illinois - 1962 6in (15cm) Dia Plastic Film disc Front Scale Sales ( % of Sales) or Number ( Percent ) Donated by Jack Rababeh, Senior Engineer at ASC |
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 REF Ahrend Construction Disk |
Ahrend Construction Disk Made in Netherlands by Ahrend Archive - Herman van Herwijnen's SR Catalogue |
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 C24 Watham - Profit Finder |
Watham - Profit Finder Made by Watham of Chicago - 1962 5-1/2in (14cm) Dia cardboard disc Front Scale # of Items, Selling Price ( Markup, Profit ) Donated by Jack Rababeh, Senior Engineer at ASC |
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 C25 Graphic - Profit Finder |
Graphic - 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 ) r> Donated by Jack Rababeh, Senior Engineer at ASC |
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 C31 Gong Se He Ying - Metalworking |
Gong Se He Ying - Metalworking calculator for Iron materials Made in China by Sheyang DALI Metal Factory Front Scale degree, meter, quantity, kilogram (Steel. Iron, cast, ball, flat steel, flat iron, flat cast) Back Scale SG, A [ B, T Cot, ST, Sin Cos ] D, DI Previous Owner: Liu Qinglin (Beijing, China) 
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 REF Chadwick #7285 Computer-Lighter |
Chadwick #7285 Computer-Lighter Made in Japan - includes a cigarette lighter and key fob Front Scale Aviation Scales, Mikes, Ground Speed, etc Back Scales: Daylight hours Calender Scans donated by Clay Castleberry  Jpeg
304KB
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