KEEP ISRM FREE!
This American slide rule manufacturer was founded in 1885 by Eugene Dietzgen. The first manufacturing company opened in 1893 producing T-squares, wooden triangles, drawing boards, hectograph inks, surveying instruments, blue print and Van Dyke papers, Dietzgen's historic line of engineering products. In 1908 the company acquired its own drafting instruments factory in Germany and introduced their "Lifetime Service Policy" on drafting Instruments. The company later OEM'ed slide rules from Faber-Castell and other engineering items and drafting instruments from Germany and from Ricoh in Japan for the American Market. Often mistaken for K&E slide rules, as many parts are interchangeable as the physical dimensions and construction are similar. The main factory and head office was in Chicago, Illinois, and branch offices were in New York, San Francisco, New Orleans, Pittsburgh and Los Angeles.



L04 Dietzgen 1742 20 inch - Phillips


L04 Dietzgen 1742 20 inch - Phillips
Made in USA
Front Scale: 20inch // E, A [ B, R, C ] D || 50cm
Back Slide: [ S, L, T ] Back: Equivalents


Dietzgen 1752P 20 inch - Maniphase

ISRM 15.03.05.01
Dietzgen 1752P 20 inch - Maniphase
Made in USA
Front Scale: 20inch // K, A [ B, CI, C ] D || 50cm
Back Slide: [ S, L, T ] Back: Equivalents
Gift of Ed Millis, Dallas, Texas.
Sleeve


Dietzgen 1762 20 inch - Mannheim, All Glass Cursor

ISRM 13.10.10.01

Dietzgen 1760 10" Version

Dietzgen  1762 20 inch - Mannheim, All Glass Cursor
Made in USA
Note: the All Glass Cursor, Patent US 1855523, is being shared with the 1760 10" version, ISRM 13.10.25.01
Front Scale: 20inch // A [ B, C ] D || 50cm
Back Slide: [ S, L, T ] Back: Equivalents



Dietzgen Mannheim (D&P) Improved Slide Rule
Patent June 28, 1898

ISRM 2012.10.22.01


Major Paul C. Allred
Fort Lewis, Washington

Case
Dietzgen Mannheim (D&P) Improved Slide Rule
Patent June 28, 1898

Made in Germany by Dennert and Pape for Eugene Dietzgen Co.
Front Scale
10inch // A [ B, C ] D || 27cm
Back Scale
[ S, L, T ] Back: Equivalents
Note: Very early 'railroad track' style divisions
Original Owner: F.P. Sisson (name on case and in well), then owned and used by Major Paul C. Allred, US Army.
Donated by Pamela Lanier Wolfe Browne, Kernersville, North Carolina
This slide rule was acquired in Germany and used by Major Paul C. Allred, US Army. (1916 - 1979). Paul joined the Army on April 11, 1934. He served as a surveyor in the Infantry Artillery most of his career in the battles and campaigns in Normandy, Northern France, Rhineland, Ardennes, Central Europe, and Korea. He was awarded the Eamet Campaign Medal with 5 Bronze stars, Good Conduct Medal, WWII victory medal, Koren Service Medal, Bronze Star Medal with oak leaf cluster, and a National Defense Service Medal. He retired in 1962. He thenb worked as a surveyor for the North Carolina Departement of Transportation, Greesboro, until retirement in 1977. Sometime while working for the state he began using a Texas Instrument calculator, but still checked his answers on his trustworthy slide rule. (Paul was Pamela's Godmother's husband)
Note: Pamela Browne is the widow of Harry Edson Browne (1933-2006). Harry Browne was an inspirational speaker who wrote 19 books that sold more than 2 million copies. In 1996 and 2000 he was the nominee of the Libertarian Party for President of the United States. Pamela's personal slide rule, a Fullerton-Acu 1240, along with photo, may be seen in the Acumath gallery.


REF Eugene Dietzgen Pocket Slide Rule
Eugene Dietzgen Pocket Slide Rule
Made in Germany - c 1915
Front Scale
A [ B, C ] D
Back Scale
5in [ S, L, T ] 12.5cm
Archive - Scan provided by Cassou Olivier Collection, France


Dietzgen 1725 Maniphase Vector Trig Type Log Log

ISRM 14.05.01.04
Dietzgen 1725 Maniphase Multiplex Vector Trig Type Log Log c1945
Made in USA - 24 scales s/n 113981
Front Scale
Sh2, Sh1, Th, A [ B, T<45 Cot, T>45 Cot, ST, S Cos ] D, DI, LL01, LL1
Rear Scale
LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2
Gift of Phillip Rodley, Upperhutt, New Zealand



Dietzgen N1725 Microglide Vector Type Log Log

ISRM 11.11.17.03
Dietzgen N1725 Microglide Vector Type Log Log c1948
Made in USA - 28 scales s/n 013933
Note: New scale arrangements from "1725" vs the new "N1725".
Front Scale
Th, Sh2, Sh1, A [ B, T<45 Cot, T>45 Cot, ST, S Cos ] D, DI, K
Rear Scale
LL01, LL02, LL03, DF [ CF, CIF, L, CI, C ] D, LL3, LL2, LL1


Dietzgen N1725 Microglide Vector Log Log (1964)

ISRM 15.02.25.01

Dietzgen N1725 Microglide Vector Log Log c1948
Made in USA - 28 scales s/n 112565
Front Scale
Th, Sh2, Sh1, A [ B, T<45 Cot, T>45 Cot, ST, S Cos ] D, DI, K
Rear Scale
LL01, LL02, LL03, DF [ CF, CIF, L, CI, C ] D, LL3, LL2, LL1
Gift of David DeSpain,of Fort Worth, Texas.. He tells us about it in his own words:
"The slide rule was a high-school graduation present in 1964 for (Farmington (MO) Senior High School) from my parents Gaines Wagner (GW) and Linda DeSpain. It was ordered for them by Willard Vandegriff, a civil engineer and PE in Farmington. I believe the list price was $28.00 and Mr. Vandegriff got it for $20.00 through his suppliers. I used it at the University of Missouri-Rolla, formerly University of Missouri School of Mines and Metallurgy, now Missouri University Science and Technology (MUST). I graduated with a Bachelor of Science degree in Electrical Engineering in 1969. Later I used the slide rule at Columbia Broadcasting System (KMOX Radio in St. Louis), while in the US Army at White Sands Missile Range in New Mexico. Sometime in the mid-70's, I put together a kit scientific calculator from Sinclair, which had all the trig and log and exponential functions, and operated only in scientific notation. I retired from the Voice of America, or Broadcasting Board of Governors, in 2008, where I was their in-house expert on high power (100, 250, 500, and 1000 KiloWatt) ShortWave and MediumWave (AM) transmitters."


REF Dietzgen B-1725 (Bamboo) Vector Type Log Log
Dietzgen B-1725 (Bamboo) Vector Type Log Log c1965
Made in Japan by Ricoh for Dietzgen - 25 scales
Front Scale
Th, Sh2, Sh1, A [ B, T<45 Cot, T>45 Cot, ST, S Cos ] D, DI, K
Rear Scale
LL01, LL02, LL03, DF [ CF, CIF, L, CI, C ] D, LL3, LL2, LL1
Archive: Larry Kehl collection


S453 Dietzgen 1731 Trigonometric  Log Log
Dietzgen 1731 - Trigonometric  Log Log - s/n 401056
Made in USA - Maniphase Multiplex  -20 scales
Note: Degrees divided in 12 divisions - minutes and seconds. The N1731 below has decimal degrees.
Front Scale
LL01, K, A [ B, T Cot, ST, S Cos ] D, L, LL1
Rear Scale
LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2
Original Owner: John Coonrod



Dietzgen N1731 Micromatic Trigonometric Log Log

ISRM 14.07.02.96
Dietzgen N1731 Micromatic Trigonometric Log Log s/n 084303
Made in USA - 24 scales
Note: Degrees divided in 10 divisions, Decimal degrees. The 1731 above has degrees in minutes and seconds.
Front Scale
LL01, K, A [ B, T<45 Cot, T>45 Cot, ST, S Cos ] D, L, LL1
Rear Scale
LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2


S295 Dietzgen 1732 Decimal Trig Log Log
Dietzgen 1732 - Decimal Trig Log Log - No s/n
Made in USA - Maniphase Multiplex - Early cursor -20 scales
Note: Degrees divided in 10 divisions - decimals
Front Scale
LL0, LL00, A [ B, T Cot, ST, S Cos ] D, DI, K
Rear Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2



Dietzgen 1732 Decimal Trig Log Log

ISRM 12.01.10.02
Dietzgen 1732 - Decimal Trig Log Log - s/n 536054
Made in USA - Maniphase Multiplex - Early cursor -20 scales
Note: Degrees divided in 10 divisions - decimals
Front Scale
LL0, LL00, A [ B, T Cot, ST, S Cos ] D, DI, K
Rear Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Typical Retail Box


S454 Dietzgen 1732 Decimal Trig Log Log
Dietzgen 1732 - Decimal Trig Log Log - s/n 574062
Made in USA - c1956  -21 scales - Re-arranged Text
Note: Degrees divided in 10 divisions - decimals
Front Scale
LL01, L, K, A [ B, T Cot, ST, S Cos ] D, DI, LL1
Rear Scale
LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2
Case labeled "Dietzgen Germany" Original owner: Michael P. Taylor, retired Director Dow Chemical. Graduated Univ of Houston, TX. Taught at TAMU and UH. Designed/Built the Houston Dow Center &Dow Chemical plant in Toronto.


S248 Dietzgen 1732 Decimal Trig Log Log
Dietzgen 1732 - Decimal Trig Log Log - s/n 518372
Made in USA - 20 scales
Note: Degrees divided in 10 divisions - decimals
Front Scale
LL0, LL00, A [ B, T Cot, ST, S Cos ] D, DI, K
Rear Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Previous owner: J.D. Hiller


Dietzgen N1732 Micromatic Decimal Trig Log Log

ISRM 14.09.21.03


Insert

Dietzgen N1732 Micromatic Trigonometric Log Log s/n 585550
Made in USA - 24 scales
Note: Degrees divided in 10 divisions, Decimal degrees. The 1731 above has degrees in minutes and seconds.
Front Scale: LL01, K, A [ B, T<45 Cot, T>45 Cot, ST, S Cos ] D, DI, LL1
Rear Scale: LL02, LL03, DF [ CF, CIF, L, CI, C ] D, LL3, LL2
Gift of Edward T. Wright of Odenton, Maryland
Edward Wright received his B.A. with Honors in Mathematics from Rhodes College (formerly Southwestern at Memphis) in 1968, followed by his Ph.D. in Mathematics from the University of Notre Dame in 1973. Ed's thesis was on compact Kahler manifolds that admit Killing vector fields. After graduate school Dr. Wright was a visiting assistant professor at Notre Dame for one school year,then worked as an (applied) mathematician for the Department of Defense for 39 years. Ed retired 2014. Ed writes: "The only time I ever used a slide rule was in high school physics (1963/64). I started collecting them off of Ebay in the 2004/5 time period. I continue to marvel at how much was accomplished with these instruments. I am in the process of down sizing the modest collection that I have, and wanted them to go some place that will preserve this part of the technology."


S287 Dietzgen 1733 Polymath Decimal Trig Log Log
Dietzgen 1733 - Polymath Decimal Trig Log Log
Made in USA - 20 scales - S/N B506105
Patents: Stock: 2,170,144; 2,285,722. Cursor: 2,634,912
Front Scale
LL01, K, A [ B, T Cot, ST, S  Cos ] D, L, LL1
Rear Scale
LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2
Previous owner:  Eugene Mulder, On slide: R.L.F.Z



Dietzgen 1733 Polymath Decimal Trig Log Log

ISRM 13.10.09.06
Dietzgen 1733 - Polymath Decimal Trig Log Log
Made in USA - 25 scales - S/N 005585
Patents: Stock: 2,170,144; 2,285,722. Cursor: 2,634,912
Front Scale
LL01, K, A [ B, T<45 Cot, T>45 Cot, ST, S Cos  ] D, DI, LL1
Rear Scale
LL02, LL03, DF [ CF, CIF, L, CI, C ] D, LL3, LL2
Previous owner. was in New Zealand
Gift of Phillip Rodley, Upper Hutt, New Zealand.



Dietzgen N1733 Polymath Multiplex
Decimal Trig Type Log Log

ISRM 11.12.16.01

Eugene Dietzgen Co. Insert Copyright 1950
Form No. 1700-SRT/500B/PN25
Dietzgen N1733 - Polymath Multiplex Decimal Trig Type Log Log
Made in USA - 25 scales - S/N 080525 - 1962
Patents: Stock: 2,170,144; 2,285,722. Cursor: 2,634,912
Front Scale (same as 1734)
LL01, K, A [ B, T<45 Cot, T>45 Cot, ST, S Cos  ] D, DI, LL1
Rear Scale
LL02, LL03, DF [ CF, CIF, L, CI, C ] D, LL3, LL2
Original Owner: Harold John Morgan, Chesapeak Beach, Maryland. Purchased 1962, used at PSU for EE degree. Worked for FCC, retired 2004.


Dietzgen 1734 Microglide Decimal Trig Log Log

ISRM 14.10.15.01


USS Pueblo 1967, Authentication Letter, Medals Awarded
Dietzgen 1734 - Microglide Decimal Trig Log Log
Made in USA - 22 scales - S/N 114559 - c1947
Front Scale: LL01, K, A [ B, T<45 Cot, T>45 Cot, ST, S Cos  ] D, DI, LL1
Rear Scale: LL02, LL03, DF [ CF, CIF, L, CI, C ] D, LL3, LL2
Original Owner(s): Sergeant (USMC) Robert J. Chicca of Bonita, California. a POW of the 1968 USS Pueblo incident with North Korea.
Gift of Edward T. Wright, Odenton, Maryland.
This slide rule belonged to USMC SSGT Robert J. Chicca,shown in the ohoto, who with the rest of the crew of the USS Pueblo (AGER-2), a signal intelligence ship, were attacked, and captured by North Korean forces on 23 January 1968, One sailor was killed in the attack. Crew members had their hands tied and were blindfolded, beaten, and prodded with bayonets. Pueblo was taken into port at Wonsan and the crew was moved twice to POW camps. The crew reported upon release that they were starved and regularly tortured while in North Korean custody. This treatment allegedly turned worse when the North Koreans realized that crewmen were secretly giving them "the finger" in staged propaganda photos They were held captive for 8 months before being released across the DMZ in December, 1968. The slide rule was also used by Roberts brother, Bill in school, while Robert was in the military. See Wickipedia entry


Dietzgen 1734 Microglide Decimal Trig Log Log

ISRM 12.06.24.24

Dietzgen 1734 - Microglide Decimal Trig Log Log
Made in USA - 22 scales - S/N 056181 - c1947
Front Scale
LL01, K, A [ B, T<45 Cot, T>45 Cot, ST, S Cos  ] D, DI, LL1
Rear Scale
LL02, LL03, DF [ CF, CIF, L, CI, C ] D, LL3, LL2
Donated by Anonymous collector and daughter .
The collector, who prefers to remain anonymous, obtained a B.S. degree in Physics from Taiwan's National Tsing Hua University in 1971. His love for computation has encouraged him to build a collection of slide rules, HP and TI calculators, as well as abaci, many displayed at ISRM.


S466 Dietzgen B-1734 Decimal Trig Log Log
Dietzgen B-1734 Decimal Trig Log Log
Made in Japan by Relay/Ricoh for Dietzgen - c1960
Note: the 'B' in the model number stands for Bamboo.
Front Scale
LL01, K, A [ B, T<45 Cot, T>45 Cot, ST, S Cos  ] D, DI, LL1
Rear Scale
LL02, LL03, DF [ CF, CIF, L, CI, C ] D, LL3, LL2


REF Dietzgen G-1734 Microglide Decimal Trig Log Log
Dietzgen G-1734 Microglide Decimal Trig Log Log
Made in Germany by Faber-Castell for Dietzgen - c1970
Note: the 'G' in the model number stands for 'Geroplast' plastic.
Front Scale
LL01, K, A [ B, T<45 Cot, T>45 Cot, ST, S Cos  ] D, DI, LL1
Rear Scale
LL02, LL03, DF [ CF, CIF, L, CI, C ] D, LL3, LL2
Archive - Larry Kehl Collection


S508 Dietzgen 1735 Vector Type Log Log
Dietzgen 1735 Vector Type Log Log
Made in USA - 21 scales - S/N 104640 - Early Frameless Cursor
Front Scale
LL0, LL00, A [ B, T Cot,  ST, S Cos  ] D, Th, Sh2, Sh1
Rear Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Original Owner: W.H. Camp


S328 Dietzgen 1737 Decimal Trig Type Log Log
Dietzgen 1737 -  Decimal Type Trig Log Log
Made in Japan by Relay/Ricoh - 22 scales Bamboo stock
Front Scale
K, A [ B, S Cos, T1 Ctg1, T2 Ctg2, C ] D, DI, L
Rear Scale
LL1, LL2, LL3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Instructions (1.02MB)


S113 Dietzgen 1738 Multilog Multiplex Style-M (c1954)
Dietzgen 1738 Multilog Multiplex Style M (Metal cursor bars)
Made in Germany, 1954 - 22 scales Improved Dec Trig Log Log; Painted Aluminum Stock,
Front Scale
LL01, K, A [ B, T<45 Cot, T>45 Cot, ST, S Cos  ] D, DI, LL1
Rear Scale
LL02, LL03, DF [ CF, CIF, L, CI, C ] D, LL3, LL2


Dietzgen 1738 Multiphase Style-M ©1954
Improved Decimal Trig Type Log Log Rule

ISRM 12.06.24.25
Dietzgen 1738 Multiphase Style M Improved Decimal Trig Type Log Log;
Made in Germany, 1954 - 24 scales, Plastic cursor bars, Painted Aluminum Stock,
Front Scale
LL01, K, A [ B, T<45 Cot, T>45 Cot, ST, S Cos  ] D, DI, LL1
Rear Scale
LL02, LL03, DF [ CF, CIF, L, CI, C ] D, LL3, LL2
Donated by the Huamg Collection.


Dietzgen 1738 Multiphase Style-M (c1954)
Improved Decimal Trig Type Log Log Rule

ISRM 11.12.02.01
Dietzgen 1738 Multiphase Style-M Improved Decimal Trig Type Log Log Rule
Made in Germany, - 24 scales Plastic cursor bars, Green slide. Painted Aluminum Stock
Front Scale
LL01, K, A [ B, T<45 Cot, T>45 Cot, ST, S Cos  ] D, DI, LL1
Rear Scale
LL02, LL03, DF [ CF, CIF, L, CI, C ] D, LL3, LL2
Original Owner: E. Nosco (Sgt) Wickcliff, Ohio, and D.A. Miller (both marked on brown leather sleeve flap)


S357 Dietzgen 1739-L Clear-Scale
Dietzgen 1739-L Clear-Scale
Made in Germany, 1954 - 23 scales Improved Dec Trig Log Log
Front Scale
L, K, A [ B, CI,  C  ] D, LL1, LL2, LL3
Rear Scale
T1 Cot, T2 Cot, DF [ CF, CIF, CI, C ]  D, S Cos, ST, P


Dietzgen Phillips 1740

ISRM 2012.06.18.04

Dietzgen Phillips 1740
Made in Germany
Front Scale
10inch // K, A [ B, R, C ] D || 25cm
Back Scale
[ S, L, T ] Back: Equivalents
This slide rule was put on eBay by RAdm Rhoad's grandson.
This slide rule was used by Rear Admiral Forrest (Dusty) Rhoads prior to or during WWII. He later bought a Hemmi 153 in 1949 which can be seen in the Sun Hemmi Gallery.

Forrest Alexis Rhoads (1898-1965) was a career naval officer in the United States Navy and his career spanned from an Apprentice Seaman to Rear Admiral and he served in both WWI and WWII. The pictures show him in rank from apprentice Seaman (on left, 1916 on the USS South Dakota), Seaman 1st Class (on left, c1920), Captain (1947), Rear Admiral (on right, 1949) and his final promotion at the National Memorial Cemetary in Honolulu, Hawaii (1965). See an expanded biography at ancestry.com.


REF Dietzgen 1741 Novo Biplex
Dietzgen 1741 Novo Biplex
Made in Germany for Dietzgen
Front Scale
K, T1 Cot, T245 Cot DF [ CF, CIF, CI, C ] D, S Cos, ST, P
Rear Scale
LL03, LL02, LL03, W2 [ W2', L, C, W1'  ] W1, LL1, LL2, LL3
Archive - Rod Lovett Collection


S338 Dietzgen 1743 Polymath Multiplex Trigonometric
Dietzgen 1743 Polymath Multiplex Trigonometric
Made in USA - 15 scales - S/N 175663
Note: Degrees divided in 12 divisions - minutes and seconds
Front Scale
K, A [ B, T Cot, ST, S Cos ] D, DI
Rear Scale
DF [ CF, CIF, CI, C ] D, L


Dietzgen 1744 Polymath Multiplex Decimal Trig

ISRM 12.06.24.29
Dietzgen 1744 Polymath Multiplex Decimal Trig
Made in USA - 15 scales - S/N 300543
Front Scale
K, A [ B, T Cot, ST, S Cos ] D, DI
Rear Scale
DF [ CF, CIF, CI, C ] D, L
Donated by Anonymous collector and daughter .



Dietzgen 1745LM USMC Issue - Magnifying Cursor

ISRM 2011.10.28.02
Dietzgen 1745LM USMC Issue - Magnifying/Frameless Cursor
Made in USA - 11 scales - No S/N
Front Scale
K, A [ B, CI, C ] D
Rear Scale
A [ S, T ] D, L
Purchased at a Denver Antique Store in 2011


S485 Dietzgen 1745 - Early Frameless Cursor
Dietzgen 1745 - Early Frameless Cursor
Made in USA - 11 scales - No S/N
Front Scale
K, A [ B, CI, C ] D
Rear Scale
A [ S, T ] D, L



S480 Dietzgen 1745 - K&E Cursor
Dietzgen 1745 - K&E Cursor
Made in USA - 11 scales - No S/N
Front Scale
K, A [ B, CI, C ] D
Rear Scale
A [ S, T ] D, L
Note: Has a K&E cursor like S300 Dietzgen 1759.


S479 Dietzgen 1746 Maniphase Multiplex - Early Cursor


S479 Dietzgen 1746 Maniphase Multiplex - Recon. Cursor
Dietzgen 1746 Maniphase Multiplex - Early Cursor
Made in USA - 12 scales - No S/N
Front Scale: A [ B, S, T ] D, K
Rear Scale: DF [ CF, CIF, CI, C ] D, L
Note: has same KERCS problem as early K&E's
Original Owner: Franklin James Sullivan, (1914-1992) born in Wilmington, Delaware. Cost Analyst at Baldwin's outside of Philadelphia, PA(1940-1945), then at Atlas Powder Company (Du Pont)/ICI. Had 3 daughters, one provided this slide rule.



Dietzgen 1746 Maniphase Multiplex - 1926 Early Cursor

ISRM 13.05.04.01


Mines Award

Dietzgen 1746 Original Cursor (1926)
The slide rule as above has a restored cursor, to replace the crumbling original shown on left. The early lens and metal lens brackets were retained, a SIC (Relay) cursor spacers were modified, drilled and tapped with 1-72 UNF threads, to accept new screws (K&E uses 1-72's). This gives this 'old soldier' a new life.
Dietzgen 1746 Maniphase Multiplex - Early Cursor - sn702167
Made in USA - 12 scales
Front Scale: A [ B, S, T ] D, K
Rear Scale: DF [ CF, CIF, CI, C ] D, L
Note: had same KERCS problem as early K&E's
Gift of Barbara Emmett of Dallas, TX, daughter of W.P. Morris.

Original Owner: William Page Morris. He used this slide rule while attending the Colorado School of Mines and later in his career. The following biography was written in 1969 when he received The American Institute of Mining, Metallurgical, and Petroleum Engineers (AIME) AIME Charles F. Rand Memorial Gold Medal: "William Page Morris was president and a director of the Duval Corporation of Houston, Texas. During his 38-year career in mining, he has given unselfishly of his time and talents to numerous associations. Mr. Morris received his degree in mining engineering from the Colorado School of Mines in 1930. He began his mining career a year later with Valier Coal Company in Valier, Illinois. In 1932 he joined United States Potash Company in Carlsbad, N. M. and stayed until 1940, worked first as an underground motorman and later (1934-1940) as a safety and haulage engineer. In 1940 Morris went to work for International Minerals & Chemical Corporation in Carlsbad and stayed on until 1949 when he joined Duval Corporation as general superintendent. At Duval he was named vice president and assistant general manager in 1954, executive vice president in March, 1957, and president in June, 1957. In October of 1967 he was appointed president and a director of Duval Sierrita Corporation and in September of 1968 president and a director of Duval Corporation of Canada. He is also a director of Duval Sales Corporation. Mr. Morris is a director of The Sulphur Institute, the American Potash Institute, Inc., and the New Mexico Mining Association. He was the 1962 recipient of the Distinguished Achievement Award of the Colorado School of Mines."



Dietzgen 1746 Maniphase Multiplex

ISRM 13.07.03.19

Dietzgen 1746 Maniphase Multiplex
Made in USA - 14 scales - sn703397
Note: Early scale set, improved cursor. Laminated mahogany stock, edges exposed
Front Scale
A [ B, T, ST, S ] D, K
Rear Scale
DF [ CF, CIF, CI, C ] D, L
Gifted by Daniel Swerdlow of Bethesda, Maryland
Daniel Swerdlow is a second-generation engineer from New York City and has degrees in electrical engineering from New York University and Michigan State University. He has done telecommunications engineering for major corporations and currently lives in the Washington, DC area and works at the United States Patent and Trademark Office. Dan has gifted most of his collection to ISRM to support the museum. Many specimens may be found in the various ISRM galleries.


S355 Dietzgen 1749 Style-M Dec Trig Maniphase
Dietzgen 1749 Style-M Dec Trig Maniphase
Made in Germany - 1959 - 15 scales
Metal stock, powder coated, silkscreened scales
Front Scale
K, A [ B, T, ST, S ] D, DI
Rear Scale
DF [ CF, CIF, CI, C ] D, L


S562 Dietzgen 1750P Maniphase
S364 Dietzgen 1750P Maniphase
Made in USA - pre1938 - 9 scales
Front Scale
10in // E/K, A [ B, R/CI, C ] D || 25cm
Rear Scale
[ S, L, T ]

This was a manufacturing transition that re-labeled both E as K and R as CI. The later was an error in implementation as R = 1/A, (100-10-1, the Phillips scale) and CI =1/C (10-1). The divisions on the center scale of the slide are for the CI or Reciprocal scale of C.


S364 Dietzgen 1750P Maniphase
Dietzgen 1750P Maniphase
Made in USA - 1938 - 9 scales
Front Scale
10in // K, A [ B, CI, C ] D || 25cm
Rear Scale
[ S, L, T ]


REF Dietzgen 1751 - Industrial Slide Rule
Dietzgen 1751 - Industrial Slide Rule
Made in USA
Front Scale
Feed, Length of Cut [ RPM, Time, Cutting Speed ] D
Rear Scale
L, A [ B, CI, C ] D, K
Scan provided by Jim Cerny, New Castle, New Hampshire
1950 Catalog Description


P259 Dietzgen 1755L Mannheim 5"
P259 Dietzgen 1755L Mannheim 5"
Made in USA - 1938 - 7 scales
Front Scale
5in // A [ B, C ] D || 12.5cm
Rear Scale
[ S, L, T ]
Note: Early Dietzgen slide rules has a model number suffix of 'P' to deonte a 'Plain' cardboard case. A suffix of 'L' is used for a sewed 'Leather' case.


S442 Dietzgen 1757 Primatrig
Dietzgen 1757 Primatrig
Made in USA by Acu-Rule for Dietzgen - All Plastic Stock/slide, metal ends. Similar to (S427) Acu-Math 600 Basic Trig
Front Scale
L, K, A [ B, CI, C ] D, T Cot, ST, S Cos
Rear Scale
Trig Identities [ Decimal to Fractions ] Equivalents

Same as S427 Acu-Math 600 Basic Trig (scales rearranged)


ISRM Dietzgen 1757 Primatrig

ISRM 12.05.06.02
Dietzgen 1757 Primatrig
Made in USA by Acu-Rule for Dietzgen - All Plastic Stock/slide/ends
Front Scale
L, K, A [ B, CI, C ] D, T Cot, ST, S Cos
Rear Scale
Trig Identities [ Decimal to Fractions ] Equivalents
Donated By Scott Reynolds, (Vintage Calculators, Inc), Helmut, California


Dietzgen Phillips 1759 1914-1915

ISRM 13.10.25.01
Dietzgen Phillips 1759 1914-1915
Made in USA
Front Scale
10inch //  A [ B, R, C ] D || E
Back Slider
[ S, L, T ] Back: Equivalents
Cursor: hairline stamped in metal on the side scale 'E'
Original Owner: Hoey, who marked the University class he was in as '15, in the well.
Note: This slide rule was used during the start of WWI. More officers were given General's stars from this 1915 class by WWII, than any other year. It is probable that Hoey survived the war, as his slide rule survived to be sold by his family on ebay in 2013, almost 100 years later.

Specimen waiting to be scanned
Dietzgen Phillips 1759B 1914-1915
ISRM 16.05.10.02

Clifford, Sr. studied chemical engineering at Carnegie Tech in the 1920's and later mechanical engineering at the University of Buffalo. He served in the Army as a Major in the Chemical Warfare Service at Edgewood Arsenal during WWII. During the Korean War, he served as the Commanding Officer of the Engineering Agency at the Army Chemical Center at Edgewood and was promoted to Brigadier General. His career in industry included serving as the Director of Central Engineering at FMC.
Dietzgen Phillips 1759B 1914-1915
Made in USA
Front Scale
10inch // A [ B, R, C ] D || E
Back Slider
[ S, L, T ] Back: Equivalents
Well: Blank Mahagony
Cursor: (missing) hairline stamped in metal on the side scale 'E'
Original Owner: Clifford L. Sayre (Sr). C.L. Sayre, marked on back.
Sleeve marked: Clifford L. Sayre Carnegie Institute of Technologies, Chemical Engineering 192?.


S213 Dietzgen Multiplex 1760B
Dietzgen Multiplex 1760B - Closed Simplex
Made in USA
Note: Degrees divided in 10 divisions - decimal
Front Scale
10inch // A [ B, C ] D || E
Back Slider
[ S, L, T ] Back: Equivalents


Dietzgen 1760P Mannheim All Glass Cursor

ISRM 13.10.25.01
Dietzgen 1760P Mannheim - Closed Simplex
Made in USA - Note the "P" in the 1760 is printed on the case flap end
Note: Degrees divided in 12 divisions - minutes and seconds
Front Scale: 10inch // A [ B, C ] D || 25cm
Back Slide: [ S, L, T ] Back: Equivalents
Note: the All Glass Cursor, Patent US 1855523, is being shared with the 1762 20" version, ISRM 13.10.10.01
Case Archive Image


S473 Dietzgen 1762B sn3746A - Patent June 28, 1898
Dietzgen 1762B sn3746A - Patent June 28, 1898
Made in USA by Eugene Dietzgen Co.
Patent Markings: June 28, 1898, Patent Aug 9, 1904
Note: Combination BI-1-B scale, Index in center of scale
Front Scale: 10inch // A [ BI-1-B, C ] D || LL
Back Slide: [ S, L, T ]
Back: Equivalents
Original Owner: R.C.L. Greer


REF Dietzgen 1763-AL Mannheim sn7625A
Dietzgen 1763-AL Mannheim sn7625A
Made in USA by Eugene Dietzgen Co.
Patent Markings: June 28, 1898, Patent Aug 9, 1904
Note: Combination BI-1-B scale, Index in center of scale
Front Scale: 8inch // A [ BI-1-B, C ] D || 20cm
Back Slide: [ S, L, T ]
Back: Equivalents
Archive - Scans provided by Cassou Olivier Collection, France


P234 Dietzgen 1765F c1925
(Unis)
Dietzgen 1765F c1925 (Unis)
Made in France by Unis MARC for Eugene Dietzgen
Same as Guedon - See Misc USA
Front Scale
5in // A [ B, C ] D
Back Scale: 13cm [ Blank ]

From Catalog page in 1925 Manual


P223 Dietzgen 1765W Handy
Dietzgen 1765W Handy
Made in USA
Front Scale
A [ B, CI, C ] D, K
Back Scale
[ S, L, T ]
Back/Well: Conversion Chart


P256 Dietzgen 1765W Handy
Dietzgen 1765W Handy
Made in USA - c1940
Front Scale
A [ B, CI, C ] D, K
Back Scale
[ S, L, T ]
Back/Well: Conversion Chart


ISRM Dietzgen 1765P Basik
Dietzgen 1765P Basik
Made in Germany
Front Scale
K, A [ B, CI, C ] D, L
Back Scale
[ S, ST, T ]
Back: Conversion Chart
Donated by David Hecht, Alexandria, VA


S296 Dietzgen 1765P Basik
Dietzgen 1765P Basik
Made in Germany
Front Scale
K, A [ B, CI, C ] D, L
Back Scale
[ S, ST, T ]
Back: Conversion Chart


S110 Dietzgen 1766P
Dietzgen 1766P - Closed  Simplex -
Made in Germany - Ca 1933
Front Scale
A [ B, C ] D
Back Slider
[ S, L, T ] Back: Conversion Chart


S308 Dietzgen 1767P National - Early Cursor
Dietzgen 1767P National - Early Cursor
Made in USA
Front Scale
A [ B, CI, C ] D, K
Back Scale
10in [ S, L, T ] 25cm, Conversion Chart (label)


S394 Dietzgen 1767P National
Dietzgen 1767P National - c1942
Made in USA - Same as Post 1446-D
Front Scale
A [ B, CI, C ] D, K
Back Scale: [ S, L, T ]
Back: Early Conversion Chart (label)


Dietzgen 1767P National

ISRM 14.09.21.07
Dietzgen 1767P National
Made in USA, possibly by Charvoz-Roos or Festus later acu-math)
Front Scale
A [ B, CI, C ] D, K
Back Slider
[ S, L, T ] Back: Conversion Chart
Gift Of Edward Wright of Odenton, Maryland.


Dietzgen 1767 National

ISRM 13.06.28.02


Dietzgen 1767 National - c1966
Made in USA by Acu-math - Note cursor fits in groove on edge of stock
Front Scale
K, S, A [ B, CI, C ] D, T, L
Back Blank
Note: This basic mannheim type slide rule was supplied to U.S Navy students attending the Nuclear Warfare School at the Nuclear Weapons Training Center - Atlantic, in the 60's and 70's. A student had to be nominated by their command to a attend this school. One of the course books Review of Mathematics and Slide Rule is on the left.
Gift Of Susan Jackson, Boulder, Colorado, daughter of Jim Rodgers

Jim Rodgers (1929-2012) used this slide rule (and others found within ISRM) during his career. He was a Naval Aviator and had training at the the Nuclear Weapons Training Center - Atlantic (c1968). He later resided in Boulder, Colorado. He was married to Ceil Rodgers for 63 years and had four children, Jim, Susan, Cathy and Stephen, and eight grandchildren. An avid reader, progressive thinker, political junkie, problem solver and perpetual optimist, Jim was loved and admired by everyone who knew him. Jim donated his body to science.


S258 Dietzgen 1767 National
Dietzgen 1767 National - c1966
Made in USA by Acu-math - Note cursor wraps around width of stock
Front Scale
K, S, A [ B, CI, C ] D, T, L
Back Blank
Orig Owner: Carol Tideman
Last owner: Patricia Turner, Boulder, CO


Dietzgen 1767 National

ISRM 11.03.23.02
Dietzgen 1767 National - c1966
Made in USA by Acu-math - Note cursor wraps around width of stock
Front Scale
K, S, A [ B, CI, C ] D, T, L
Back Blank
Donated by David Sweetman
Instructions (10.3MB PDF) Gift Of Phillip Rodley


S371 Dietzgen 1768P Reliance
Dietzgen 1768P Reliance - Closed Simplex
Made in USA c.1940
Front Scale
A [ B, CI, C ] D, K
Back Scale
10inch [ S, L, T ] 25cm
Back: Equivalents


S402 Dietzgen 1768-P
Dietzgen 1768-P - Open Simplex
Made in Japan (by Fuji?) for Dietzgen, c1970
Front Scale
K, S, A [ B, CI, C ] D, T, L
Back: Blank
Purchased out of Lima., Peru
Note: braces on back side of stators.


S493 Dietzgen 1768-P Maniphase
Dietzgen 1768-P Maniphase -Open Simplex
Made in Japan (by Fuji?) for Dietzgen, c1970
Front Scale
K, S, A [ B, CI, C ] D, T, L
Back: Blank
In Unopened Retail Bag, Note braces on scale side of stators.



S501 Dietzgen 1769
Dietzgen 1769 - pre WWIII
Made in USA
Front Scale
10inch // A [ B, C ] D, K || 25cm
Back Scale
[ S, L, T ] Back: Equivalents



S257 Dietzgen 1769P Federal
Dietzgen 1769P Federal - cWWII
Made in USA
Front Scale
10inch || A [ B, CI, C ] D, K || 25cm
Back Scale
[ S, L, T ] Back: Equivalents
Original Owner: Unk


P058_Dietzgen [Redi-rule]
Dietzgen [Redi-rule] - Simplex
Made in USA
Front Scale
K, A [ B, CI, C ] D
Back Slide: [S, ST, T ]
Back 5in, 12.5mm


P197 Dietzgen [Redi-rule]
Dietzgen [Redi-rule] - Simplex
Made in USA
Front Scale
5in // K, A [ B, CI, C ] D \\ 12.5cm
Back Scale: [S, L, T ]
Back: Blank


P172 Dietzgen [Redi-rule - no markings]
Dietzgen [Redi-rule] - Simplex
Made in USA
Front Scale
5in // K, A [ B, CI, C ] D \\ 12.5cm
Back Scale: [S, L, T ]


P043 Dietzgen 1771 redirule
Dietzgen 1771 - 5" Redirule
Made in USA - 9 scales
Front Scale
A [ B, CI, C ] D, K
Rear Slider: [S, L, T
Back Adv: A.E. Stanely Mfg. Co
Original Owner (on case): Init=OVD, date 12-25-54


ISRM Dietzgen 1772A
Dietzgen 1772 A
Made in USA by Acu-Rule/Sterling- 10 scales
Front Scale: K, A [ B, CI, C ] D, L
Back: Blank
Original Owner: H.W.F. (Initials on sleeve)
Donated by David Hecht, Alexandria, VA.


REF Dietzgen 1772B Union Slide Rule - Mannheim
Dietzgen 1772B Union Slide Rule - Mannheim
Made in USA - c1930
Front Scale: A [ B, C ] D
Rear Scale: [ S, L, T ]
Archive - Contributed by Jan Pratt


P200 Dietzgen 1773 System Darmstadt
Dietzgen 1773 System Darmstadt- Date code 1258
Made in Germany for Dietzgen by Faber-Castell - 14 scales
Same as Faber-Castell 67/54 B Darmstadt
Front Scale (extended)
5in // L, K, A [ B, CI, C ] D, P, S, T
Back Scale 14cm [ LL1, LL2, LL3 ]


P221 Dietzgen 1774-M Maniphase
Dietzgen 1774-M Maniphase - post WWII
Made in Germany (U.S. Zone) for Dietzgen by Ecobra - all Aluminum
Front Scale (extended)
5in // K, A [ B, CI, C ] D, L
Back Scale: [ S, T ]




Dietzgen 1776 Redirule Pocket Duplex

ISRM 14.07.02.84
Dietzgen 1776 Redirule Pocket Duplex
Made in USA - 15 scales
Front Scale
K, A [ B, T, ST, S ] D, DI
Rear Scale
DF [ CF, CIF, CI, C ] D, L
Gift of Ed Millis Collection, Dallas, Texas.


Dietzgen 1776 Redirule 5" Pocket (Duplex)

ISRM 13.07.03.12

Instructions 10.9MB
Dietzgen 1776 - 5" Redirule Pocket Duplex
Made in USA - 15 scales - Complete in Box
Front Scale
K, A [ B, T, ST, S ] D, DI
Rear Scale
DF [ CF, CIF, CI, C ] D, L
Promotional Marking: KOPPERS
Gift of Dan Swerdlow, Bethesda, Maryland.


DH090 Dietzgen 1776 redirule
Dietzgen 1776 - 5" Redirule
Made in USA - 15 scales
Front Scale
K, A [ B, T, ST, S ] D, DI
Rear Scale
DF [ CF, CIF, CI, C ] D, L
ADV: Electronic Specialty Co.
Donated by David Hecht, Alexandria, VA


REF Dietzgen 1777 (ECOBRA)
Dietzgen 1777
Made in Germany, U.S. Zone - All Metal
Front Scale
K, A [ B, R, C ] D, L(Lg)
Rear Scale
12cm [ Sin, Tg ] 5in
Scan donated by Olivier Cassou, France
Case Marked "Germany, U.S. Zone"


P040 Dietzgen 1778 Pocket MultiLog
Dietzgen 1778 - Pocket MultiLog
Made in Germany - 24 scales
Front Scale
L, Ti, T2 A [ B, BI, CI, C ] D, ST, S Cos, P
Rear Scale
LL03, LL02, LL01, K [ K', C, CIF, CF ] DF, LL1, LL2, LL3
Cursor: Multi-lined
Markings: K.A.Sandahl


P040 Dietzgen 1779 Pocket Log
Dietzgen 1779 - Pocket Log
Made in Germany U.S. Zone - 17 scales - In Box
Front Scale
K, A [ B, Lg, C ] LL3, LL2, LL1
Rear Scale
Sin Cos, Tg Ctg, DF [ CF, CI, C ] D, P
Cursor: Multi-lined, D, Q, W, HP


REF - Dietzgen 1797A (Gilson Atlas) Type-3 21.1cm dia
Dietzgen 1797A (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 - No longer 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 War Veteran - 2 Purple Hearts



Dietzgen 1797M (Gilson Midget 1931, 1936) V1

ISRM 11.05.16.01
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
Note: This is in the Circular gallery and used here as it matches the Dietzgen OEM



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


REF - Dietzgen 1798 - Dempster RotaRule - model AA
Dietzgen 1798 - 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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