Circular Slide Rules and selected Disk Charts
This gallery has a wide variety of circular slide rules and many of these images are duplicated on their respective manufacturer or country galleries, like the Concise line of slide rules. 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.

KEEP ISRM FREE!
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
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, Science Spectrum Inc., 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


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


ALRO PATENT System ALRO 200R

ISRM 13.01.26.01
ALRO PATENT System ALRO 200R
Made in The Hague, Holland
Dimensions: 125x135x12 mm
Patents No's (stamped on metal hub): USA 2,117,155; France 808,295; Gr. Britain 443689; Belgium 413,897; Germany 643,571; Holland 41,324
Front Scale
S, T, S&T, kW, N2, N ( N , N2, R, N3)
Cover Scale: Decimal/fraction, Log spiral scale
Acquired from the Netherlands, made possible by a gift from Robert L. Allison of Ballard, Washington.
See many more specimens in the ALRO gallery here at ISRM.


Dempster RotaRule - model AA (Dietzgen 1798 w/Case)

ISRM 13.05.28.01


Instruction Sheet, Legal size, two front and back sheets
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 )
Acquisition made possible by contributions from Dick Rose Vintage Instruments

Dietzgen Model 1798C leather case, Model 1798 shown in 1938 Dietzgen Catalog (in ISRM Library), additional image from Hermann's Slide Rule Catalog as ISRM specimen has a faded back cursor.



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)


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
Detail of Sliding Cursor mounted on Rotating Cursor on Smith Chart Side.
This slide rule and others in the ISRM archives were donated through the generosity of Phillip Rodley of New Zealand


Science Spectrum Octal-Decimal Slide Rule Calculator

REF
Science Spectrum Octal-Decimal Slide Rule Calculator 1969
Made in USA by Science Spectrum, Inc, Santa Barbara, Calif.
Designed by Phillp J. Wyatt, Albert S. Trundle, Judith B. Bruckner
Patent Filed in 1969: Issued April 4, 1972, US 3,654,437
8in Diameter Vinyl Plastic disk.
Note: This design is similar to the single Gilson circular slide rule with three cursor arms.
Back Scale: (Octal: CO, C20) (Decimal: D spiral scale)
Archive - Photo by David Sweetman collection, Nevada

Company Logo, 1969 Sales Brochures (236 Kb PDF), 1972 Patent (1MB PDF)


Science Spectrum Hexa-Decimal Slide Rule Calculator

REF
Science Spectrum Hexa-Decimal Slide Rule Calculator 1969
Made in USA by Science Spectrum, Inc, Santa Barbara, Calif.
Designed by Phillp J. Wyatt, Albert S. Trundle, Judith B. Bruckner
Patent Issued 1972, Filed in 1969: US 3,654,438
8in Diameter Vinyl Plastic disk.
Note: This design is similar to the single Gilson circular slide rule with three cursor arms.
Front Scale: (Octal: CH, CIH, AH, LH) (Decimal:C, CI A, L ) ( 16H: Decimal Powers of 10H(=16D) Scale)
Back Scale: (Octal: CH ) (Decimal: D spiral scale)
Archive - Photo by David Sweetman collection, Nevada

Company logo, 1969 Sales Brochures (236 Kb PDF), 1972 Patent (1Mb PDF)


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


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


General Industrial Slide Rule 1959

ISRM 14.01.10.10
General Industrial Slide Rule 1959
Made in USA. by Slide-chart Corp. PERRYGRAF Corp, Maywood, Ill.
for General Industrial Co., 1788 Montrose, Chicago 13, Ill. LOngbeach 1-5871
4in Diameter PaperBoard
Front Scale: D, ( C )
Back: Instructions
Gift of Bill Wehrend Collection, Palo Alto, California.


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)".



CPU-48/P B-47/B-52 Air Navigation Bombing Computer

ISRM 13.06.26.01


B-47 Stratojet, B-52 Stratofortress, CPU-48/P Kit
CPU-48/P B-47/B-52 Air Navigation Bombing Computer (1964)
8 inch diameter. Made in USA by Felsenthal Instruments for the U.S. Government. Fesenthal MFR's No. FAA-38A. FSN-6605-994-4946.
Used for computing air navigation and bombing solutions in the USAF, specifically for the B-47 and B-52 jet bombers. See instructions for scales.
Donated By Robert Snyder in memory of his father Earl Snyder

1938

1951
Earl L. Snyder, was a fighter pilot in the US Army Air Force in WWII flying the P-51 Mustang in combat in Europe, and during the Korean War with the USAF he flew the F-86 Sabre. Later in the USAF Reserves he flew transports including the C-118 and C-124. One is of him during Civilian Pilot Training in Spokane, Washington about 1938. The other is him with an F-86 at Shepherds Grove air base in Suffolk, England in October 1951 where he was stationed with the 92nd Fighter Interceptor Squadron.
CPU-48 Instructions (10.36MB PDF). Designed by Colonel H.F. Korger USAF (SAC) and Mr. N.M. Gaudio, Chief Design Engineer, Fesenthal Instruments Company


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


Dalton Dead Reckoning Computer
Type E6B AN-5835-1 Military Version cWWII

ISRM 10.12.12.02
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)


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


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


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.


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.


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


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



Mascot Vest Pocket Slide Rule

ISRM 13.10.26.01

Instructions (1.51MB PDF)
Mascot Vest Pocket Slide Rule - 1934
Made or distributed in USA by Tavella Sales Compan, 25 West Broadway, New York, N.Y.
Note: Tavella Sales Co. also distributed the Gilson Midget at one time.
Material 0.7mm[0.067in) thick 69mm[2.72in] diameter plastic disk
Front Scale: L, D ( C, CI )
Back Scale: S, A, K, T


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



REF Gilson Midget (1919 Patent Pending) Early Artwork
Gilson Midget - 9.9cm dia - 1919 Patent Pending
Made in USA - Gilson Slide Rule Co., Niles, Michigan
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


Gilson Midget (Patent 1-17-1922 Niles, Mich.)
ISRM 13.11.23.01
Gilson Midget - 10.2cm [4in] dia - Patent 1-17-1922
Made in USA - Gilson Slide Rule Co., Niles, Michigan
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.

Catalog from 1922 (4.06MB PDF)

Instructions from 1922 (2.25MB PDF)


REF Gilson Midget (Patent 1-17-1922 Stuart, Florida)
Gilson Midget - 10.2cm [4in] - 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



Gilson Midget (1931, 1936)

ISRM 11.05.16.01
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.
Compass Midget (1931, 1936)
ISRM 10.09.14.02

David Viscusi

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, California 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)
Instructions


Dietzgen 1797M (Gilson Midget) V2
ISRM 08.04.10.01

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) and the background is a darker green.
Front Scales
C,CI,A,K,Log,LL1,LL2,LL3,LL4,
Back Scales
Binary, Fraction,Drill,Thread, Millimeter
Donated by Bruce Chelf of Porter, Indiana
3.72MB PDF


Cal-Co Patent Circular Slide Rule

ISRM 13.08.11.01


Photos of Francis Donchi, with European Ford Capri, and with grandson Nicolai Donchi, la Brianza, Italy.
Cal-Co Patent Circular Slide Rule
Made in Italy. Outer stator disk is 6.5 cm [2.6 inch], inner disk is 5.5 cm.
Country of origin based on 'SIN' being printed as 'SEN'
and metric HP conversion gauge mark of '736'.
Note: Appears to be painted/silkcreen on aluminum disks with brass hub. c1940
Front Scales: C ( D, A, K )
Back Scales: L, SEN 1, SEN 2, TG
Note: Concentric Sine scales
Donated by Nicolai Donchi, Monza, Italy in memory of his Grandfather Francis Donchi.
This artifact was found in the house of his Grandparents. and was owned by his Grandfather. Francis Donchi (1917-1993). Born in August 17, 1917 in Paina Brianza in Lombardy (Italy) where he finished elementary school and for the next 7 years, helped his father, Francesco, in the fields. At 18 he started working in a textile company on the banks of the River Lambro (Monza river) living modestly. At age 22 he was drafted into the Italian Army where he served with honor for 4 years from 1939 to 1943. After WWII he met his wife, who was a girl from his own village. Francis received a 'gratitude of war' after a few years for a lung disease due to breathing the toxic smoke created by the war industries. Though partially invalid he began a quiet life in Carate Brianza (Lombardy) and to have a child that carries on the family name. Francis had a second job restoring furniture in his house, which had many tools of the trade and where this slide rule was discovered after his death at age 76.


REF Latt-Mayer S.A. 42-8125 Circular Slide Rule
Latt-Mayer S.A. 42-8125 Circular Slide Rule
Made by Latt-Mayer S.A., Rio De Janeiro. Approximately 5cm in diameter.
Front Scale
C (D)
Back: Promotion of Latt-Mayer product line (Portugese)
Archive - Photo by Joćo Roberto Gabbardo collection, Brazil

Pickett 101-C Dial Rule (1962)

ISRM 10.09.13.02

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.


Pickett 101-C Dial Rule (c1964)

ISRM 12.05.02.04

See other slide rules from this talented family in the K&E, Relay/Ricoh, and Post Galleries.

Anne Kilby with mother Ruth Moira Kane (1959)
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.
Expanded Family Biography of Wallace and Ruth Kane and daughter Ann Kilby (7.09MB)


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


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


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.
Instructions, 1965-66 (German) (4.82MB PDF)


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
Instructions, 1970 (German) (6.2MB PDF)


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
Instructions, 1970 (German) (6.2MB PDF)


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.


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


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


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


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


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


REF Radiac Nuclear Yield Calculator Set ABC-M28A1 - Disk One


REF Radiac Nuclear Yield Calculator Set ABC-M28A1 - Disk Two
Radiac Nuclear Yield Calculator Set ABC-M28A1
Made in USA - NATO number NSN6665-00-130-3616, 4-1/2in Dia. plastic
Scales:
TIME OF ENTRY, ENTRY-EXIT TIME AFTER BURST, DOSE-RATE (RADS/HOUR), DOSE (RADS), TRANSMISSION FACTORS, YIELD-STABILIZED CLOUD BOTTOM (KT), STABILIZED CLOUD BOTTOM OR TOP OF ELEVATION ANGLE, ALIGN FLASH-TO-BANG TIME WITH ELEVATION ANGLE, READ YIELD ON APPROPRIATE SCALE UNDER POINTER, DISTANCE TO GROUND ZERO (KM), FLASH-TO-BANG TIME (SECONDS), YIELD FROM ILLUMINATION TIME, FIREBALL ILLUMINATION TIME (SECONDS).

Carrying sleeve, sample problem card
Archive - BajaRon photos placed on ebay

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