Circular Slide Rules
Many of these are duplicated on their respective manufacturer pages. Specialized/promotional
cardboard/plastic film circular slide rule/calculators are also found at the Slide Charts Gallery.
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


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


 Archive - This specimen belong to a Dutch mechanical engineer, Tony Krijnen, who used this in Burma in the 1930's in the oil fields of Bornea, Dutch East Indies . Tony died soon after WWII after being held prisoner in the Japanese camps in Java and Burma. Scan contributed by his son, Dr. H. John Krijnen, Netherlands


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)


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)


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


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


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


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


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)".



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


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


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 Biography
Front 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
James Robert Weber (1928-2010) Served in the U.S. Air Force, then joined Martin Marietta in Colorado and worked on the ICBM project. In 1965 he was hired on as pilot and technician for National Center of Atmospheric Research (NCAR) flew many flights using a Cessna 172 and a T-28 into storms as part of the National Hail Research Experiment (NHRE), and later the Microscale Meteorology Division. Later James was responsible for maintaining NCAR's link to the University Satellite Network which was connected to the Woods Hole Oceanographic Institution and other U.S. research centers. He retired from NCAR in 1993 after 28 years of service. He is survived by his wife Lois Anne.


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)


ISRM American Airlines Navigational Computer Type "B"		 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


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


ISRM Whitehead Holding Pattern Computer		 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.


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


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 PDF
Includes insert on atomic bomb survival.


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


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


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


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)


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.


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
Donated by the children of Norman D. Fulton Jr.
Norman D. Fulton (1918-2010) used this Graphic Chemical Predictor during his career at Proctor and Gamble Co. He held various, positions at P&G heading up analytical labs, methods departments and other R&D areas where he could apply his knowledge and Sc.B. in chemistry. He retired in 1983 in Loveland, Ohio. His children, Ginger, Bobbie and Norman (Dudley) wanted to honor their father with this donation.


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


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


REF Military Attack Computer		 Military Attack Computer
Made in USA
Front Scale
Air Speed, Lead angle, Time, Distance, etc.
Archive - Not in collection


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


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

Equiv Manual 3.42Mb


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)


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


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


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


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


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


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.
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)


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


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

ISRM - Pickett 101-C Dial Rule		 Pickett 101-C Dial Rule - 10.2cm dia
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.


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


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)


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


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


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


C14 Pickett 107-ES		 Pickett 107-ES - 8cm dia
Made in Japan
Front Scale:  [ L, CI, C] D, A, K
Back Scale: Equivalents


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


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


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


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


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


REF Aristo 0602 (1972)		 Aristo 0602 (1972)
Made in Germany
Front Scale
A ( B, -50%/+100%(Mark-Up) )
Back: TBD
Archive - Wenzel Collection


REF Aristo 622 (1970)		 Aristo 622 (1970)
Made in Germany
Front Scale
K, D, A,( B, CI )
Back: TBD
Archive - Wenzel Collection


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


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


C06 Lietz 3625-20 8.4cm		 Lietz 3625-20 8.4cm Dia
Made in Japan
Front Scale
D ( C, CI, A, K )
Back: equivalents


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


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


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


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


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


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


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


C12 Pacemaker		 Pacemaker
Made in Japan by Concise- 8.4cm Dia
Front Scale
D ( C, CI, A, K )
Back: Conversions


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


ISRM Concise 28		 Concise 28
Made in Japan by Concise - 8.4cm Dia
Front Scale
D ( C, CI, A, K )
Back: Conversions


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


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


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


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 )


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 )


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


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


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.


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


ISRM - Sama & Etani (Concise) 600P Overhead Projector Model		 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


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
Jeff Ilseman Collection, Longmont, Colorado.
Instruction Manual 4.5MB


ISRM - Concise Science Tables and Slide Rule - US Govt.		 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


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


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


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


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.
Original Owner: John Vincent Atanasoff, (1903-1995) Father of the First Digital Computer. This scan of one of his three slide rules on display in the ISRM galleries were provided by the Iowa State University Library, Atanasoff Archives. See also his model K&E N4080-3 S/N 798671 for an expanded biography


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)

Original Owner: John Vincent Atanasoff, (1903-1995) Father of the First Digital Computer, used while in the service during WWII. This scan of one of his three slide rules on display in the ISRM galleries that were provided by the Iowa State University Library, Atanasoff Archives. See also his model K&E N4080-3 S/N 798671 for an expanded biography


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


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


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


C26 Multor Currency Exchange 		C26 Multor Currency Exchange
Made in WestGermany - 3 color metal 8.8cm disk
Front Scale
D (C, A )
1.17Mb


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


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.


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


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


REF Ahrend Construction Disk 		Ahrend Construction Disk
Made in Netherlands by Ahrend
Archive - Herman van Herwijnen's SR Catalogue


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


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


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)


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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