Circular Slide Rules and selected Disk ChartsThis gallery has a wide variety of circular slide rules and many of these images are duplicated on their respective manufacturer or country galleries. Specialized/promotional cardboard/plastic film circular slide rule/calculators are also found at the Slide Charts Gallery. The advantage of circular slide rules, is that the dimensions can be small enough to fit in your shirt pocket, yet have the scale resolution of a standard linear slide rule. Construction is simple as the only only fastener is the single screw or rivet at the center of the disk. A few Disk Charts are ahown which logarithmic scales or of unusual construction.
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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 |
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Manufacturers found in this gallery (in no particular order), USSR Artillery, Alro, Dempster, Boykin, Huet, Amphenol, Miller Dial,
C-Thru, General Electric, Martin Company, Layne (Thomas Sheahan designs), G. Felsenthal & sons, General Luminescant Corp, Cruver Manufacturing Co., J.B. Carroll Company, Weems System, Weems & Plath, American Airlines, Jeppsen, Whitehead, Aero Products Research,
White & Gillespie, American Hydromath Company, T&T Calculator, Associated Spring Corp, Standardgraph, Gilson, Compass, Dietzgen, Pickett, Aristo, faber-Castell, Lietz, SIC, Scientific Instruments, Concise, Sama&Etani, Lafayette, US Army Signal Corps, Cox, Hemmi, Norton & Gregory, Controller Calculator, Mascot, Circhlow, Emeloid Operations, Graphic Calculator Co., Ahrend, Waltham, Educational Instruments, Inc., Chadwick, Gong Se He Ying. |
![]() 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 OAO Kalibr Moscow Circular Slide Rule Calculator |
OAO Kalibr Moscow Circular Slide Rule Calculator Made in USSR by OAO Kalibr-Moscow Front Scale (with logo) K, A, C ( D, CI ) Back Scale: T, ST, S ( C, L ) Photo Contributed By Dushan Grujich Collection, Australia |
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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 (1921-2011), 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
Bernard C. Boykin passed away May 12, 2011. He was born in Ruxton, Maryland in 1921. He earned a BS degree in Chemistry from Williams College in 1942/43 and another BS degree in Chemical Engineering from John Hopkins University in 1954. During World War II he was a radar officer in the United States Navy. After the war he designed the Boykin RotaRule, a very complex disk slide rule used by engineers and scientists for their calculations. It was based on the Dempster's Rotarule design who's patent had expired, but with improved scales. The trig scales are in decimal degrees. | ||||
![]() 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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![]() Amphenol Circular Slide Rule & RF Smith Chart ISRM 13.02.13.05 Note: Bunker Ramo Corporation was founded by George M. Bunker and Simon Ramo in 1964, jointly owned by Martin-Marietta and Thompson Ramo Wooldridge TRW. The resulting company, Bunker-Ramo, was based in Trumbull, Connecticut.It became a manufacturer of military electronics devices and digital computers. In 1967 the Amphenol corporation (a manufacturer of electrical connectors) merged with Bunker Ramo. |
Amphenol Circular Slide Rule & RF Smith Chart Made in USA by Bunker Ramo, Amphenol RF Division, Danbury, Connecticutt. 9.25in [23.5cm] Diameter Plastic Film Front Scale: D, ( C, CI,A, K, L, T Cot, S Cos, ST) Back: Radio Frequency Smith Chart (with cursor on cursor): Wavelength toward Generator, Wavelength toward Load (Angle of Reflection, Negative Reactance Component, Positive Reactance Component, Resistance Component) Cursor Scales: Voltage or Current Limits, Voltage or Current Ratio, Attenuation Dissipation Reflection, IDB Loss, Toward Generator, Toward Load
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![]() Miller Dial Circular Slide Rule ISRM 13.02.23.01 |
Miller Dial Circular Slide Rule Made in USA. Data Charts by Miller Dial,El Monte, Calif. 6in Diameter PaperBoard Front Scale: D, ( C, CI, L, A, K) Back: Instructions |
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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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![]() REF SCA Circular Slide Rule |
SCA Circular Slide Rule (1973) Made in Australia by Slide Charts of Australia Front Scale (Extended) CI, C ( D, A, K, L) Back Scale Orginal Area (Conversion Factor, Converted Area) Scan provided by Cyril Catt. Australia |
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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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![]() REF - Space Vehicle Pocket Designer for Three Stage Rockets |
Space Vehicle Pocket Designer for Three Stage Rockets Made in USA by the Martin Company (1959) Front Scale: Planetary Orbits, Velocity, Weight Index (Vacumm Specific Impulse) Courtesy Of Paul Ceruzzi, National Air And Space Museum |
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![]() ISRM - Ground Water Hydrology Computer |
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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![]() ISRM AN-5837-1 Alititude Correction Computer - c1943 |
AN-5837-1 Alititude Correction Computer - c1943 Made in USA under a 1943 USAAF contract by G. Felsenthal & sons, Chicago, Illinois. (Mfr's Part No. FAA-9) Note: Other known manufacturers of this device were Cruver Manufacturing Co. (Mfr's Part No. C1920) and J.B. Carroll Company of Chicago (Mfr's Part No. 101) Front Scale: Pressure Altitude at Ground in Feet, Mean Temperature (True Altitude in Feet, Indicated Altitude in Feet ) Back Scale: Instructions Label on box: "If in storage after Aug 15, 1948 this instrument to be tested and re-inspected before issue" Donated By Carlee Heit in memory of her late husband Ray Heit. One of many specimens in Ray's collection
Carton
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![]() REF Time Distance Computer Type D-4 USAAF - c1943 |
Time Distance Computer Type D-4 USAAF - c1943 Made in USA under a 1943 USAAF contract by General Luminescant Corp Note: Other known manufacturers of this device were Cruver Manufacturing Co. Front Scale: True Altitude, Air Temp, Press. Alt. (ETA, Air Speed ) Back Scale: Cal. Air Speed, Air Temp, True A.S. (presure Altitude, Density Altitude) Archive - Not in collection
Carton
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![]() ISRM Dalton Dead Reckoning Computer Type E6B AN-5835-1 Military Version cWWII |
Dalton Dead Reckoning Computer - Type E6B AN-5835-1 Made in USA by Weems System of Navigation, Annapolis, Maryland, 1932 Invented by Philip Dalton, LTJG (1903 - 1941) United States Military Scientist Patent: 2,097,116 Philip Dalton BiographyFront Scale: Distance Naut Miles, True Air Speed (Time Min, Hrs, Density Altitude, Air Temp ) Back Scale: Wind Correction Angle( True Heading ) Donated by the estate of James Robert Weber, Lafayette, Colorado |
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![]() ISRM Dalton Dead Reckoning Computer Type E6B Commercial Version Post WWII |
Dalton Dead Reckoning Computer - Type E6B Commercial Version Made in USA by Weems System of Navigation, Annapolis, Maryland, Post WWII Invented by Philip Dalton, LTJG (1903 - 1941) Patent: 2,097,116 Front Scale: Distance Naut Miles, True Air Speed (Time Min, Hrs, Density Altitude, Air Temp ) Back Scale: Wind Correction Angle( True Heading ) Donated By Carlee Heit in memory of her late husband Ray Heit. One of many specimens in Ray's collection
Instructions (8.51MB PDF)
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![]() American Airlines Navigational Computer Type "B" ISRM 10.03.01.04 |
American Airlines Navagitional 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 Jeppesen Computer Model R-1 |
Jeppesen Computer Model R-1 Made in USA by Jeppesen, Denver Colorado, 1955 Copyright 1955 by Ray Lahr, Patent # 2,528,518 Front Scale: Distance Naut Miles, Gal.True Air Speed (Time Min, Hrs, Density Altitude, Air Temp, True Altitude, Pressure Altidue) Back Scale: Wind Correction Angle( True Heading ) Donated by the estate of James Robert Weber, Lafayette, Colorado |
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![]() Whitehead Holding Pattern Computer ISRM 10.03.01.06 |
Whitehead Holding Pattern Computer Made in USA by Whithead, 2900 N. Keystone ST., Burbank, California Front Scale: Inbound Holding Course, Outbound Course Back Scale: Inbound Holding Course, Outbound Course Original Owner: Charles H. Eaton (1913 - 1982) Donated by Prof. Robert C. Eaton, Univ of Colorado, in memory of his father. |
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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 Aero Products Research CR-6 (Aviation) Computer |
Aero Products Research CR-6 (Aviation) Computer Made in USA by Aero Products Research, Los Angeles, CA. 6 inch Diameter, 5 disks + Cursor. Copyright 1974 Front Scale Cal. Air Speed, True Air Speed, Temp Rise, Mach Number, TAS Knots, Speed/Fuel Conversions (Indicated Air Speed, CAS, Pressure Altitude, Indicated Air Temp ) Back Scale True Air Speed Index, Magnetic Course, Relative Wind( True Course ( Wind Drift )) Donated by Carlee Heit, Houston, Texas, in memory of Ray Heit. Ray Heit Collection. 8.4MB PDF |
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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 W&G Aerial Dead Reckoning Computer R.A.A.F. Mk 1 |
W&G Aerial Dead Reckoning Computer R.A.A.F. Mk 1 Made in Australia by White & Gillespie Front Scale: Distance Naut Miles, True Air Speed (Time Min, Hrs, Density Altitude, Air Temp ) Back Scale: Wind Correction Angle( True Heading ) Scan provided by Cyril Catt. Australia |
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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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![]() 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 Graphic Chemical Predictor |
Graphic Chemical Predictor Made in USA by Dyna-slide Co. Chicago, Illinois - 8" diameter Front Scales - Chemical Compunds, Oxidization Equations, Reduction Equations Back Scale - Instructions |
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![]() T & T Fast Calculator ISRM 09.10.21.09 |
T & T Fast Calculator Made in USA - 5-5/8" x 7" Front Scale - Wire Calculator: Wire Size (Amperes) System Index Back Scale - Motor Calculator: Load (Fuse Sizes) Donated by Marten C. Jensen Instructions
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![]() ISRM - 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)) 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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![]() ISRM 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
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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
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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
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![]() ISRM 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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![]() ISRM - 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 Donated By Ric Turley, Pinecliff Colorado, in memoriam for Roy Glenn Wood (1932-2005) Roy owned this circular slide rule and had attended the University of Colorado at Boulder. He worked as an engineer for Public Service Company of Colorado for more than 30 years. |
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ISRM CompassMidget (1931, 1936) |
Compass Midget (1931, 1936) - 10.2cm dia Made in USA for Compass 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 Donated by David Viscusi, Carlsbad, Californis David bought this slide rule when he was a Drafting apprentice at General Electric, Schenectady NY (1971). Already well used, it was purchased for $5 from a retiring engineer that helped design Large Steam Turbine Generators. It helped get him through his BSME night courses. David is now an Engineering & Technical Services Supervisor at Gemological Institute of America (GIA)
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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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Pickett 101-C Dial Rule - 10.2cm dia (1962) Made in USA - c1962 Front Scale: C, CI, A, AF, L, FA, LL2, LL1, DS, DT, M Back Scale: C, S, ST, T, Fractions-Decimal Donated by Mike Medlock, Greenwood, Indiana As Mike prepared to enter Purdue in 1962, his brother Allen was completing his B.S. in Mathematics - also at Purdue. His brother decided a great gift for his younger brother as he began his college career would be a slide rule. Just to be different he decided to purchase a circular slide rule, certainly a oddity at the time. Mike used the slide rule throughout his college career and was amused by the odd looks from fellow engineering students. He graduated with a B.S. Chem. Eng. from Purdue University 1967. |
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Pickett 101-C Dial Rule - 10.2cm dia (c1964) Made in USA, Aluminum disk with 3 plastic cursors Front Scale: C, CI, A, AF, L, FA, LL2, LL1, DS, DT, M Back Scale: C, S, ST, T, Fractions-Decimal Note: Scale Labels embossed in RED on transparent cursor Owned and donated by Ann Kilby, Kingston, Washington. Ann's parents were scientists at Livermore Labs so she was competent with slide rules at an early age. She used this one while in high school and during her first few years at college. Her university education led her down paths of Zoology, Secondary-education, Physical chemistry, Sinology and Psychotherapy, culminating in a profession of healing arts and counseling. |
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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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![]() ISRM - 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 |
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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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![]() General Electric - Defense Electronics Division ISRM 09.10.21.10 |
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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![]() Concise 28N Motorola Semiconductors ISRM 09.10.21.11 |
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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![]() ISRM 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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![]() 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 |
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![]() REF Concise 28N |
Concise 28N Made in Japan by Concise - 8.4cm Dia Front Scale D ( C, CI, A, K ) Back: MKS/CGS conversions for Velocity, Pressure, Flow Rate Length, Area, Weight, Volume, Power Energy & Heat, Temperature Conversion, Density Archive - Art Kautz Collection |
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![]() REF Concise 28N ISRM 13.01.09.01
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Concise 28N Made in Japan by Concise - 8.4cm Dia Front Scale: D ( C, CI, A, K ) Back: Equivalents, alternative artwork than the previous 28N, mostly linear units. Sleeve: SRL - System Research Laboratories, Inc. Dayton, Ohio Donated by Michael P. Maloney Michael P. Maloney finished pre-engineering at Niagara University in 1965 and graduated as an Electrical Engineer in 1968 from the University of Detroit. He also attended George Washington University and received a Master Degree in Engineering Management in 1978. After graduating from the University of Detroit, he joined the Department of Defense (DoD) and retired as a Technical Director in 1997. While working for the DoD, Mr. Maloney had three tours in Europe totaling 13 years. Mr. Maloney used the ten different types of slide rules or slide charts in the design, development, installation and maintenance of communication and radar systems. These have been donated to ISRM. Mike writes: "Of particular interest to me is the shirt pocket SRL circular slide rule and my white plastic ‘nerd pack’ (shirt pocket protector). These two items traveled with me on all my TDYs (business trip) while stationed in Europe during the ‘Cold War’." Upon retiring from the DoD Mr. Maloney worked for Raytheon, Applied Signal Technology, Conquest, Boeing and Hayden Software Consulting. Mr. Maloney has five patents and enjoys wood working, traveling, reading and developing algorithms for solving cryptograms. |
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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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![]() Concise 320 with Calendar ISRM 12.06.24.02 |
Concise 320 Made in Japan by Concise - 9.7cm Dia Front Scale D ( C, CI, A, K ) Back Scale Unit Conversions ( Calender - shows years 1968 through 1981) |
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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
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![]() Sama & Etani 600P Overhead Projector Model ISRM 11.11.11.01 |
Sama & Etani (Concise) 600P Overhead Projector Model Made in Japan by Concise Front Scale: 4in || D ( C, CI, L, A, S, T, K) || 10cm Actual size: 2X original = 6 inch x 8-1/2 inch Transparent Plastic stock and disks Donated by Carlee Heit in memory of her husband, Ray Heit Collection |
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![]() Sama & Etani Model 600-ST Science Tables and Slide Rule ISRM 13.04.01.02 |
Sama & Etani Model 600-ST Science Tables and Slide Rule Made in Japan by Concise, Designed by Sama & Etani,Copyright 1968 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. Donated by Albert Klumpp, Arlington Heights, Illinos.
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![]() Concise Science Tables and Slide Rule - US Govt. ISRM 10.03.01.05 |
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: U.S. Government Donated by Prof. Robert C. Eaton, Univ of Colorado |
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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 (American Oil) |
Sama & Etani/Concise CTCS-552 Slide Rule - Copyright 1966 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 Zdenka Novosad, Louisville, Colorado Zdenka used this slide rule during her career as a petroleum engineer. She attended high school in Czechoslovakia. She graduated from the University of Pennsylvania (1975) and later became a Petroleum Engineer for Shell Canada Limited and was a member of the Society of Petroleum Engineers. One of her many papers, published in 1996 by the journal 'SPE Reservoir Engineering', was Composition and Phase Changes in Testing and Producing Retrograde Gas Wells and she wrote Spectroscopic and Magnetic Resonance Studies of Aromatic Molecules published by the Graduate School of Arts and Sciences, University of Pennsylvania, 1975. |
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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
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![]() REF Sama & Etani CTCS-552 Conversion Tables |
Sama& Etani 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 |
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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 ) |
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![]() REF Controller Circular Slide Rule 75mm Diameter |
Controller Circular Slide Rule 75mm Diameter Made in Munich, West Germany, bu Controller Calculator KG, DGRM, c1959 Front Scale C ( D, A, K) Back - Conversions Archive - Scan Donated by Rod Lovett Collection. | ||||
![]() Controller Circular Slide Rule 75mm Diameter 1970 ISRM 13.03.15.02 |
Controller Circular Slide Rule 75mm Diameter 1970 Made in Munich, West Germany, bu Controller Calculator KG, DGRM, 1970 Front Scale C ( D, A, K) Back - Conversions Warranty Number: 705/3433R
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![]() REF Controller 110R Circular Slide Rule 110mm Diameter |
Controller 110R Circular Slide Rule 110mm Diameter Made in Munich, West Germany, bu Controller Calculator KG, DGRM, c1961 Front Scale C ( D, A, K) Back - Conversions Archive - Scan Donated by Giovanna Breda Collection. | ||||
![]() REF Controller 110R Circular Slide Rule Version 2 110mm Diameter |
Controller 110R Circular Slide Rule Version 2 110mm Diameter Made in Munich, West Germany, by Controller Calculator KG, DGRM, c1961 Front Scale C ( D, A, K) Back - Conversions Archive - Scan Donated by Giovanna Breda Collection. | ||||
![]() Controller 110R Circular Slide Rule Version 3 110mm Diameter ISRM 13.03.15.03 |
Controller 110R Circular Slide Rule Version 3 110mm Diameter Made in Munich, West Germany, by Controller Calculator KG, DGRM, 1970 Front Scale C ( D, A, K) Back - Conversions Warranty Number: 705/5433Y
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![]() REF Controller 200R Circular Slide Rule 220mm Diameter |
Controller 200R Circular Slide Rule 220mm Diameter Made in Munich, West Germany, by Controller Calculator KG, DGRM, c1961 Front Scale C ( D, A, K) Back - Conversions Archive - Hermann's Slide Rule Catalogue. | ||||
![]() 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 |
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![]() ISRM 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. |
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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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![]() 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 ) 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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![]() 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 |
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![]() REF Educational Instruments Corona 1 |
Educational Instruments Corona 1 - c1965 Made in USA by Educational Instruments, Inc - 9cm Diam plastic 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 |