Keuffel and Esser, Standard Scales

KEEP ISRM FREE!
This gallery displays K&E slide rules with standard general-purpose mathematical scales. See K&E Specialty Slide Rule gallery for slide rules with special scales for specific industries and applications. Also see Rarities Slide Rule gallery for older or rare K&E's not shown in this gallery.

Keuffel & Esser Co., Hoboken, New York, sold and manufactured slide rules, drawing instruments and other technical supplies. Established in 1884, sold rules from 1886, began manufacturing their own rules in 1891 and continued until 1976. Over the course of their history Keuffel & Esser became the largest manufacturer of slide rules in the US. In 1967, Keuffel & Esser, commissioned a study of the future. The report predicted that, by the year 2067, Americans would live in domed cities (possibly influenced by Issac Asimov's robot novel Caves of Steel) and watch three-dimensional television. Unfortunately for the company, the report failed to predict that slide rules would be obsolete in less than ten years, replaced by the pocket calculator. By 1976, Keuffel & Esser mothballed its slide rule manufacturing equipment and sent it to the Smithsonian Institution. They transitioned into CAD equipment in the 1980's.
For more detail, dating and related history go to the K&E Catalog Page by Clark McCoy.

This gallery begins with the long 20" slide rules, then continues by model number, sorted by date of manufacturer.




K&E 4078

ISRM 11.10.28.01

Detail of 4078 factory markings
K&E 4078 Production Lot #7. 1900
Made in Germany for K&E by Dennert & Pape. W. Cox patent Oct 6, 1891. Shown in 1900 catalog
Front Scale: A [ B, C ] D
Back Scale: A [ BI, CI ] D
Note: First of the 20" long Duplex's. With Brass Indicator (Chisel Cursor). The only other known specimen of this model is in the Smithsonian Institute, National Museum of American History..


K&E 4051-5 (1936)

ISRM 09.01.12.49
David's first slide rule was a circular Pickett 101-C, which he acquired in high school. His interest led his parents to give him a K&E 68-1210 as a graduation gift. After college, David worked fifteen years for the U.S. Navy as a contracting officer and is now retired from Civil Service. His slide rule collection specializes in Picketts and he enjoys traveling to board game conventions.
K&E 4051-5 S/N 505553 (1936)
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale: 20inch // A [ B, C ] D || 50cm Metric Rule
Back Slide: [ S, L, T ]
Back: Equivalents and Abbreviations From U.S. Bureau of Standards
Donated by David Hecht, Alexandria, VA
David is a donor of a large number of slide rules to ISRM and its Slide Rule Loaner Program.


K&E 4053-5 Lot 79 (1916-1933)

ISRM 13.02.20.09
Martha acquired her husband, John Prince's collection after his passing in 2005. She joined the Oughtred Society and has since attended several OS meetings, hosting the 2013 Winter meeting in Tucson, Arizona. She is actively selling off John's collection, and jokingly states "I have fulfulled.one of John's desires, to have me involved in his slide rule collection".Martha lives in Tucson, AZ.
K&E 4053-5 Lot 79 (1916-1933)
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale: 20inch // A [ B, CI, C ] D || K
Back Slide: [ S, T, L ]
Back: Equivalents and Abbreviations From U.S. Bureau of Standards
Donated in part by Martha Prince, Tucson, Arizona, from the John Prince Collection.
Martha is a donor of slide rules to ISRM and its Slide Rule Loaner Program.


K&E N4053-5 20 inch Polyphase Mannhiem (1936-1942)

ISRM 13.01.09.02
Carolyn (randall) Diviacchi writes: "This slide rule belonged to my father, Edwin Benjamin Randall, Jr. who worked At the National Bureau of Standards, Washington D.C., and then in Gaithersburg, MD. He was trained in organic chemistry at Harvard, '46. He was African American raised in Cambridge, MA by his parents and an only child. He used the slide rules regularly and taught me as well as my sisters how to do simpler calculations with a slide rule. At the National Bureau he worked on setting standards for quality for various government interests including rubber and paper. He once explained to me that he was working on the standards for tire rubber which was I think at the time they were beginning to introduce reinforcing rubber or radial tires. He selected tested and selected papers to be purchased by the U.S. government, which was of course an enormous consumer." K&E N4053-5 20 inch Polyphase Mannhiem - S/N 771644
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale: 20inch // A [ B, CI, C ] D, K || 50cm
Back Slide: [ S, L, T ]
Back: Equivalents and Abbreviations From U.S. Bureau of Standards
Original owner: Edwin Benjamin Randall, Jr. (1924-2003)

Donated by Carolyn (Randall) Diviacchi and Gail (Randall) Horton
This slide rule belonged to Carolyn and Gail's father, Edwin Benjamin Randall, Jr. who is shown in the photo working in a lab at the National Bureau of Standards - NBS, ca1950, (now the National Institute of Standards and Technology - NIST).


K&E N4080-5 20in Log Log Duplex Trig (1948-1952)

ISRM 12.03.16.01
K&E N4080-5 Log Log Duplex Trig - S/N 632018
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale: LL01, K, A [ B, T, ST, S ] D, L, LL1
Back Scale: LL02, LL02, DF [ CF, CIF, CI, C ] D, LL3, LL2


K&E 4081-5 20in Log Log Duplex DeciTrig (1961-1962)

ISRM 12.05.06.02

Wallace E. Kane (2005)
. See other slide rules from this talented family in the Circular, K&E, Pickett, Ricoh, and Post Galleries.
Wallace Kane used the above 20 inch slide rule while at Lawrence Radiation Laboratory at Livermore (now LLNL) California. Wallace was born in Wisconsin (1930), used slide rules starting with his under graduate studies at Lawrence College in Appelton, Wisconsin. After graduation he enlisted in the Air Force with duties as a musician, stationed at Keflavik, Iceland. He again used a slide rule to obtain his masters degree in physics from the University of Wisconsin in Madison, WI. After graduation he worked at Lawrence Radiation Laboratory at Livermore where he married fellow physicist Ruth Mary Farwell Kilby (later: Moira Kane) (1921-2007) (Ruth also has a slide rule on display at ISRM). The couple relocated to the Puget Sound area in 1973 to work as a physicist for the Navy at Keyport, Washington for the next 33 years where he retired at age 75. K&E 4081-5 Log Log Duplex DeciTrig - S/N 630198
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale: LL00, LL0, A [ B, T, SRT, S ] D, DI, K
Back Scale: L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Note 1: SRT scale shows up in 1955, in 1954 it was labeled ST
Note asset number etched in left brace P.O.7143309
Note laminated mahogony and celluloid edges, making this one of the most attractive and warm-feeling slide rules made by K&E.
Owned by Wallace E. Kane, Kingston, Washington. Donated by step-daughter Anne Kilby, Kingston, Washington
Expanded Family Biography of Wallace and Ruth Kane and daughter Ann Kilby (7.09MB)


K&E 4081-5 20in Log Log Duplex DeciTrig (1939)

ISRM 04.04.22.01
K&E 4081-5 Log Log Duplex DeciTrig - S/N 860426
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale: LL00, LL0, A [ B, T Cot, ST, S Cos] D, DI, K
Back Scale: L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Note: This 20" (-5) slide rule needed a new cursor but cursors for 0.312inch thick stocks are very hard to find, except on other 20" slide rules. An improved cursor for a 0.250inch (-3) thick stock was used, with spacers cut out of an old credit card. An Xacto knife and a pair of scissors can be used to shape the spacers. Holes made with a drill press and a 1/6" drill.


K&E 4088-5 20in Log Log Duplex DeciTrig, All-glass cursor

ISRM 13.02.20.12
K&E 4088-5 Log Log Duplex DeciTrig - c1916-1920
Made in U.S.A. - All-glass cursor, no Serial number
Front Scale: K, A [ S, T, CI ] D, L
Back Scale: DF [ CF, CIF, C ] D


L08 K&E 4088-5 20in Log Log Duplex DeciTrig, All-glass cursor
K&E 4088-5 Log Log Duplex DeciTrig - S/N 103104 c1922-1933
Made in U.S.A. - All-glass cursor
Front Scale: K, A [ B, S, T, CI ] D, L
Back Scale: DF [ CF, CIF, C ] D


K&E N4088-5 20in Improved cursor

ISRM 09.01.12.01
K&E N4088-5 S/N X6623X c1940-1955
Made in U.S.A. - Improved cursor
Front Scale: K, A [ B, S, T, CI ] D, L
Back Scale: DF [ CF, CIF, C ] D
Note: 1st and last digits of Serial number was altered.
This may have been stolen sometime in its long life
Donated by David Hecht, Alexandria, VA


K&E 4092-5 20in Log Log Duplex (1937)

ISRM 13.09.15.02
K&E 4092-5 Log Log Duplex - S/N 103094
Made in U.S.A. by Keuffel & Esser, N.Y.
Patents marked on stock: June 5, '00, Dec. 22, '00, Cursor: 2,086,502
Front Scale: K, A [ B, S, T, CI ] D, L
Back Scale: DF [ CF, CIF, C ] D
Original owner: An institution that marked "PNo4092 DEPT. E-5" on the stock for use.
K&E 4095-5 Merchant's Rule (1922)
ISRM 13.02.20.08
See K&E Specialty Slide Rule gallery
K&E N4096 M 20" Merchant Rule
ISRM xx.xx.xx.xx
See K&E Specialty Slide Rule gallery


L07 K&E 68-1608 Polyphase
K&E 68-1608 Polyphase S/N 050062 c1962-1975
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale: 20inch // A [ B, CI, C ] D, K || 50cm
Back Slide: [ S, L, T ]
Back: Equivalents and Abbreviations U.S. Bureau of Standards
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.



REF K&E Early Import
K&E Early Import
Made in France for K&E by Tavernier-Gravet
Front Scale
20cm // A [ B, C ] D || 20cm
Back Scale: [ S, L, T ]
Back: Equivalents (conversion factors)
Note: Medaillis d'Or 1878 et 1889 - This means a gold medal for excellence
Archive: Herman van Herwijnen SRC


REF K&E 1744 - Wm.Cox Patent 1891
K&E 1744 - Wm.Cox Patent
Note: This was the predecessor to model 4070
Patent US 460930, Issued Oct 6, 1891
Made in Germany for K&E by Dennert & Pape. 1900
Front Scale
A [ B, C ] D
Back Scale
A [ BI, CI ] D
Archive: Herman van Herwijnen SRC


REF K&E 1744B - Wm.Cox Patent 1891
K&E 1744 - Wm.Cox Patent
Note: This was the predecessor to model 4070
Patent US 460930, Issued Oct 6, 1891
Made in Germany for K&E by Dennert & Pape. 1900
Front Scale:
A [ B, C ] D
Back Scale:
A [ BI, CI ] D
Archive: Mike Frey Collection.


Wm.Cox Patent drawing

US 460930 (PDF)
REF K&E 1744 1/2 - Wm.Cox Patent
K&E 1744 1/2 - Wm.Cox Patent
Predecessor to model 4060
Patent US 460930, Issued Oct 6, 1891
Made in Germany for K&E by Dennert & Pape. 1900
Front Scale
A [ B, C ] D
Back Scale
A [ BI, CI ] D
Archive: Herman van Herwijnen SRC


REF K&E 1746 (D&P)
K&E 1746 (D&P) RR track scales
Made in Germany by Dennert & Pape - circa 1888
Front Scale
20cm // A [ B, C ] D \\ 26cm
Well: 26-51 cm
Back Scale
Equivalents [ S, L, T]
Archive - Clay Castleberry Collection


P109 K&E 4031

W.L.E.Keuffel
Patent drawing
June 5, 1900
US 0651142 (PDF)
K&E 4031
Made in U.S.A. by Keuffel & Esser
Patent US 0651142, Issued June 5, 1900
Front Scale
5inch // A [ B, C ] D || 12cm
Back Scale
[ S, L, T ]
Back: Equivalents


P214 K&E 4031 (Finely Divided)
K&E 4031 (Finely Divided) s/n 302
Made in U.S.A. - Pat June 5, 1900
Front Scale
5inch // A [ B, C ] D || 13.7cm
Back Scale
[ S, L, T ]
Back: Equivalents


REF K&E 4031 Mannheim
K&E 4031 Mannheim c.1909
Made in U.S.A. - Pat June 5, 1900
Front Scale
5inch // A [ B, C ] D || 13.5cm
Back Scale
[ S, L, T ]
Back: Equivalents
Scan donated by Paul Tarantolo, Houston, Texas.


P109 K&E 4032
K&E 4032
Made in U.S.A. - Pat June 5, 1900
Front Scale
5inch // A [ B, C ] D \\ 13cm
Back Scale
[ S, L, T ]
Back: Equivalents
Original Owner: W.B. Ross (on case and SR)
Scan donated by Clay Castleberry, California


S044 K&E American
K&E American
Made in U.S.A. Est. date prior to1900 - Boxwood
Front Scale
10In // A [ B, C ] D || 25Cm
Back Scale
[ S, L, T ]
Channel: 25 to 52Cm scale


REF K&E 4035 Mannheim
K&E 4035 Mannheim c.1909
Made in U.S.A. - Pat June 5, 1900
Metal framed glass cursor
Front Scale
8inch // A [ B, C ] D || 21.2cm
Back Scale
[ S, L, T ]
Back: Equivalents
Scan donated by Paul Tarantolo, Houston, Texas.


REF K&E 4035 Mannheim Finely Divided Lot 453

ISRM 13.05.05.01
K&E 4035 Mannheim Finely Divided Lot 453
Made in U.S.A. - circa 1915
Frameless glass cursor
Front Scale
8inch // A [ B, C ] D || 21.2cm
Back Scale
[ S, L, T ]
Back: Equivalents




REF K&E N4035 Mannheim
K&E N4035 Mannheim sn308600
Made in U.S.A. c.1931
Frameless glass cursor
Front Scale
8inch // A [ B, C ] D || 20cm
Back Scale
[ S, L, T ]
Back: Equivalents
Scan donated by Paul Tarantolo, Houston, Texas.


REF K&E N4035 Mannheim
K&E N4035 Mannheim sn308715
Made in U.S.A. c.1931
Improved glass cursor
Front Scale
8inch // A [ B, C ] D || 21.2cm
Back Scale
[ S, L, T ]
Back: Equivalents
Scan donated by Paul Tarantolo, Houston, Texas.
Note: The serial number on this K&E N4035 with the improved glass indicator (cursor)
predates the offering of that indicator. The improved glass indicator was introduced
around 1935-1936. This may have been replaced.


REF K&E 4040 with Chisel Cursor
K&E 4040 with with Chisel Cursor
Made in U.S.A. circa 1900
Front Scale
10 Inch // A [ B, C ] D \\ 27 Cm
Back Scale
Equivalents [ S, L, T ]
Well: 27-52cm
Scan donated by Clay Castleberry, California


REF K&E 4041 with RR Track Scales
K&E 4041 with RR Track Scales
Made in U.S.A. circa 1900
Front Scale
10 Inch // A [ B, C ] D \\ 27 Cm
Back Scale
Equivalents [ S, L, T ]
Scan donated by Clay Castleberry, California


REF K&E 4041-3 with Decimal Keeper
K&E 4041-3 with Decimal Keeper
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
Inch // A [ B, C ] D || Cm
Back Scale
[ S, L, T ]
Scan donated by Clay Castleberry, California


K&E N4041-3

ISRM 13.06.25.08
K&E N4041-3 s/n 637284
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
Inch // A [ B, C ] D || Cm
Back Scale
[ S, L, T ]
Gifted by Norma Tanner of Libertyville, Illinois


S251 K&E 4053-2 8in
Finely Divided
K&E 4053-2 8 inch s/n 25
Made in U.S.A. - Pat June 8, 1900 - Finely-Divided Scales
Front Scale (scale labels on right)
8in // A [ B, CI, C ] D || LL
Back Scale: [ S, L, T ]



S262 K&E N4053-2 8in Finely Divided
K&E N4053-2 8 inch s/n175230
Made in U.S.A. - Improved cursor - Finely-Divided Scales
Front Scale (scale labels on left)
8in // A [ B, CI, C ] D, K  || 20cm
Back Scale
[ S, L, T ]


REF K&E 4053
K&E 4053 No Model No.
Made in U.S.A. - c.1909
Front Scale (scale labels on right)
10in // A [ B, CI, C ] D || K
Back Scale
[ S, L, T ]
Back: Table of Equivalents
Scan donated by Paul Tarantolo, Houston, Texas.


S082 K&E 4053
K&E 4053 No s/n or dash number - c1909-1912
Made in U.S.A. - Early Pat June 8, 1900
Front Scale (scale labels on right)
10in // A [ B, CI, C ] D || K
Back Scale
[ S, L, T ]
Back: Table of Equivalents


K&E 4053-3 (1913)

ISRM 10.03.01.04
K&E 4053-3, Production #741, 1913
Made in U.S.A. - with the metal framed cursor
Front Scale (scale labels on left)
10in // A [ B, CI, C ] D || K
Back Scale
[ S, L, T ]
Back: Table of Equivalents
Original Owner: E.G. Dary '13
Donated by Martha H. Prince in memory of John Prince, Tuscon, AZ


K&E 4053-3 (1915)

ISRM 10.03.01.11
K&E 4053-3, Production #317, 1915
Made in U.S.A. (the only year with the metal cursor bars)
Front Scale (scale labels on left)
10in // A [ B, CI, C ] D || K
Back Scale
[ S, L, T ]
Back: Table of Equivalents
Donated by Martha H. Prince in memory of John Prince, Tuscon, AZ


K&E 4053-3 (1916-1921)

ISRM 10.03.01.12
K&E 4053-3 Lot No 545
Made in U.S.A. - 1916
Front Scale
10in // A [ B, CI, C ] D, K || 25cm
Back Scale
[ S, L, T ]
Back: Table of Equivalents
Original Owner: Rand
Donated by Martha H. Prince in memory of John Prince, Tuscon, AZ


K&E 4053-3 (pre-1922 with 1936 cursor)

ISRM 10.03.01.10
K&E 4053-3 Lot #44 pre-1922
Made in U.S.A. Note: 1936 Improved Cursor
Front Scale
10in // A [ B, CI, C ] D || K
Back Scale
[ S, L, T ]
Cursor Patent 8-17-15
Back: Table of Equivalents
Donated by Martha H. Prince in memory of John Prince, Tuscon, AZ
Note: The 1936 K&E Catalog offered their new Improved Cursor Designs that had a hairline on the plastic block as a replacement for older slide rules with scales on the edge. These hairline blocks were not needed or found on 1936-1955 N4053's with the K scale on the face below the D scale. The K scale was moved to face in 1922. The edge became a 25cm linear scale and did not need the extended hairline.
  ;   ;
1936 K&E Catalog pages 329, 330 & 331 showing Replacement Cursors


K&E N4053-3 (c1942)

ISRM 10.03.01.13

John Prince Martha H. Prince
Martha continued John's interest in slide rules by being activily involved in the Oughtred Society and being a supporter of ISRM.

K&E N4053-3 S/N 920438 c1916-1933
Made in U.S.A. by Keuffel & Esser Co., New York
Note: the serial number dates the stock around 1942, but it has an All Glass Cursor withPlastic Blocks which was made from 1916-1933. (appears to have a plastic replacement for the glass). It should have the improved metal framed cursor. Unfortunately, those had KERCS, so using an older design was a better idea.
Patents: Stock 1,934, 232; Cursor: Pat. 8-17-15
Front Scale
10in // A [ B, CI, C ] D, K || 25cm
Back Scale
[ S, L, T ]
Cursor Patent 8-17-15
Back: Table of Equivalents
Donated by Martha H. Prince in memory of John Prince, Tuscon, AZ
John Prince III (1941-2005) John graduated from Southern Methodist University Magna Cum Laude with a B.S.E.E., and he earned an M.S.E.E. and Ph.D. from North Carolina State University. Worked at Texas Instruments, then as a professor at Clemson University. In 1983 became a Professor of Electrical & Computer Engineering at University of Arizona. John specialized in collecting K&E rules, with a strong interest in Pickett. In 2002, John described how he started with slide rules back in 1960: "I used a K&E 4181-3. We were mandated to use either a 4081-3 or 4181-3 in our freshman slide rule class. I chose the cheaper (very important to a married 18 year old) rule and never regretted it despite the dire predictions from some faculty about dimensional stability and durability." Among John's awards were the 1988 Inventor Award by Semiconductor Research Corp., the 1988 Semiconductor International Technology Achievement Award and the 1991 Arizona Innovator of the Year.


K&E N4053-3 (c1927 with 1933 cursor)

ISRM 10.03.01.14
K&E N4053-3 S/N 178042 c1933-1935
Made in U.S.A. by Keuffel & Esser Co., New York
Note: The serial number dates the stock around 1927. The Lens Protection on Cursor block was produced from 1933-1935, so this was a replacement to one broken or lost.
Front Scale
10in // A [ B, CI, C ] D, K || 25cm
Back Scale
[ S, L, T ]
Cursor Patent 8-17-15
Back: Table of Equivalents
Donated by Martha H. Prince in memory of John Prince, Tuscon, AZ


S043 K&E N4053-3
K&E N4053-3 S/N 031010
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
10in // A [ B, CI, C ] D, K || 25cm
Back Scale
[ S, L, T ]
Back: Table of Equivalents
Owned and used by Frank K. Armour, Born Dec 28, 1917 Toledo, Ohio. Died Feb 13, 2004 Louisville, Colorado. Graduate of Cleveland University c1940. Mr. Armour retired Vice President of Engineering for Interlake Steel, in Toledo, Ohio.
NotePart of a bulk transfer the Computer History Museum


K&E N4053-3 with Magnifying Cusor

ISRM 11.12.14.01
K&E N4053-3 with Magnifying Cusor - sn802716
Made in U.S.A. by Keuffel & Esser Co., New York - U.S.Military Issue
Patents: Stock: 1,934,232. Cursor: 2.086,502. Front Scale
10in (Broken Off) // A [ B, CI, C ] D, K || 25cm
Back Scale
[ S, L, T ]

Sleeve Marked U.S. on flap.


S095 K&E N4053-3
K&E N4053-3 S/N 464886
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
10in // A [ B, CI, C ] D, K || 25cm
Back Scale
[ S, L, T ]
Note: The Model was moved to the left side and K&E Added to the slide onthe right


K&E 4053-3 c.1956

ISRM 13.06.25.07
K&E 4053-3 c.1956
Made in U.S.A.- Plastic and wood construction
Front Scale
10in // A [ B, CI, C ] D, K \\ 25cm
Back Scale
[ S, L, T ]
 Back: Conversion Factors
Gifted by Norma Tanner of Libertyville, Illinois


S275 K&E 4054 Wood Sleeve
K&E 4054  s/n 55, Circa1901-1915
Made in U.S.A. - No laminate on ruler, Early cursor
Front Scale
10in // A [ B, C ] D || 26cm
Back Scale
[ S, L, T ]

Check out the mahogany storage sleeve with the tin metal insert.


K&E 4054 10" Favorite Mannheim c1948

ISRM 11.11.04.01
K&E 4054 10" Favorite Mannheim S/N 291745
Made in U.S.A. by Keuffel & Esser Co., New York
Note: Improved Cursor - added CI and K scales
Front Scale
A [ B, CI, C ] D, K
Back Scale
[ S, L, T ]


S067 K&E 4055 10" Mannheim c1935
K&E 4055 10" Mannheim S/N 526528
Made in U.S.A. by Keuffel & Esser Co., New York
Note: All Glass cursor with flanged cursor blocks
Front Scale
A [ B, C ] D
Back Scale
[ S, L, T ]


K&E 4055 10" Mannheim c1937

ISRM 14.01.10.16
K&E 4055 10" Mannheim S/N 948951
Made in U.S.A. by Keuffel & Esser Co., New York
Note: New Improved Cursor
Front Scale
A [ B, C ] D
Back Scale
[ S, L, T ]
Donated by Bill Wehrend Collection, Palo Alto, California.


S053 K&E 4056 Favorite Trademark Slide Rule
K&E 4056 S/N 944322
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
A [ B, C ] D
Back Scale
[ S, L, T ]


K&E 4058 Student's Slide Rule (pre-1925)

S396
K&E 4058 Student's Slide Rule
Made in U.S.A. - Note: all wood framed cursor
Front Scale
A [ B, C ] D
Back Scale
[ S, L, T ]


S239 K&E (4058) Beginner's Slide Rule (1925-1929)
K&E (4058) Beginner's Slide Rule
Made in U.S.A. - Note: all wood framed cursor
Front Scale
A [ B, C ] D
Back Scale
[ S, L, T ]
Back : Equivalents (note slight differences from S396 above)


S478 K&E 4058C Beginners Slide Rule (1930)
K&E 4058C Beginners Slide Rule
Made in U.S.A. - Note: all wood framed cursor
Note: Student hid formulae in well - clever way to cheat
Front Scale
A [ B, C ] D
Back Scale
[ S, L, T ]
Back : Equivalents (note slight differences from S396 and S239 above)


K&E 4058W Beginner's Slide Rule (1930-1943)

ISRM 09.01.12.50
K&E 4058W Beginner's Slide Rule
Made in U.S.A. - Painted white before adding scales. Black Metal framed cursor
Front Scale
A [ B, C ] D
Back Scale
Equivalents [ S, L, T ]
Donated by David Hecht, Alexandria, Virginia


K&E 4058W Beginner's Slide Rule (c1943)

ISRM 13.06.25.03


Norma Tanner with Pickett Teaching slide rule
K&E 4058W Beginner's Slide Rule
Made in U.S.A. - Note difference in Cursor frame: Bright Metal framed cursor
Front Scale
A [ B,  C ] D
Back Scale
[ S, L, T ]
Previous owner: A loaner from a school's Textbook Department. This may very well be during WWII when limited resources made it difficult for individuals to buy slide rule
Gifted by Norma Tanner of Libertyville, Illinois
Norma has been a participant of the ISRM Slide Rule Loaner Program. In addition, she had her own collection that she loaned out to students. This one is part of the collection sent to ISRM. Norma writes: "After teaching math and/or science for 24 years, I am now enjoying retired life. Having been educated at MIchigan State University during a time when using a slide rule was the only technology available for advanced calculations, I decided to create a unit of study for my students that would introduce them to the slide rule. My goals were for students to strengthen their ability to estimate and use scientific notation, as well as to discover the historic significance of the slide rule. While it was hard for them to put aside their electronic calculators, they were fascinated, engaged, and thrilled when they could multiply 2 x 3 and actually get 6 instead of 5.9. In the end my students were happy to be reunited with their calculators, but had a new appreciation for the value of estimating, scientific notation, and accuracy in measurement. Goals met! "


K&E N4058W Beginner's Slide Rule (1954)

ISRM 12.05.02.03

See other slide rules from this talented family in the Circular, K&E, Pickett, Relay/Ricoh, and Post Galleries.
K&E N4058W Beginner's Slide Rule
Made in U.S.A. - Note: One piece molded clear Plastic Cursor introduced 1954
Front Scale: A [ B, CI, C ] D, K
Back Scale: Equivalents [ S, L, T ]
Owned and donated by Ann Kilby, Kingston, Washington.

Anne Kilby with mother Ruth Moira Kane (1959)
Ann's parents were scientists at Livermore Labs so she was competent with slide rules at an early age. She used this one prior to high school. 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)


REF K&E 8858 Beginners (WWII Wartime Loaner)
K&E 8858 Beginners (WWII Wartime Loaner)
Made in U.S.A. - 1942
Front Scale: A [ B, C ] D
Back Scale: [ S, L, T ]
Back: Model number and description of loan terms Note: Issued for deposit of $1 as a loaner to meet war shortage
Scan donated by Paul Tarantolo, Houston, Texas.


REF K&E 4061-T Column Cursor
K&E 4061-T - patent Dec 22, 1908
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
A [ B, S, C ] D
Back Scale: Note Scales on this side are all red, before the change to only inverse scales being red
A [ BI, T, CI ] D, L
Scan donated by Clay Castleberry, California


REF K&E 4061-T All Glass Cursor
K&E 4061-T - patents: June 5, 1900 and Dec 22, 1908
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
A [ B, S, C ] D
Back Scale: Note Scales on this side are all red, before the change to only inverse scales being red
A [ BI, T, CI ] D, L
Scan donated by Clay Castleberry, California


REF K&E 4061 Clamshell Cursor
K&E 4061 c.1909
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
A [ B, C ] D
Back Scale: Note Scales on this side are all red, before the change to only inverse scales being red
A [ BI, CI ] D
Scan donated by Paul Tarantolo, Houston, Texas.


REF K&E 4061-T (Trig) Clamshell Cursor
K&E 4061-T c.1909
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
A [ B, S, C ] D
Back Scale: Note Scales on this side are all red, before the change to only inverse scales being red
A [ BI, T, CI ] D || L
Scan donated by Paul Tarantolo, Houston, Texas.


REF K&E 4065-T (Trig)
K&E 4065-T (Trig) - patent Oct 6, 1891
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
A [ B, S, C ] D
Back Scale
A [ B, T, C ] D
Scan donated by Clay Castleberry, California


REF K&E 4065 Clamshell Cursor
K&E 4065 c.1909
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
A [ B, C ] D
Back Scale: Note Scales on this side are all red, before the change to only inverse scales being red
A [ BI, CI ] D
Scan donated by Paul Tarantolo, Houston, Texas.


REF K&E 4065 Frameless Glass
K&E 4065 c.1915
Frameless glass cursor with metal guides
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
A [ B, C ] D
Back Scale: Note Scales on this side are all red, before the change to only inverse scales being red
A [ BI, CI ] D
Scan donated by Paul Tarantolo, Houston, Texas.


REF K&E 4065-T (Trig) Frameless Glass
K&E 4065-T c.1916
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
A [ B, S, C ] D
Back Scale: Note Scales on this side are all red, before the change to only inverse scales being red
A [ BI, T, CI ] D, L
Scan donated by Paul Tarantolo, Houston, Texas.


REF K&E 4070 Chisel Cursor
K&E 4070 Chisel Cursor
Made in U.S.A.- Note: Patent Oct 6, 1891
Front Scale
A [ B, C ] D
Back Scale
A [ BI, CI ] D
Archive: Ted White Collection


K&E 4070-3 Trig

ISRM 13.10.07.08
K&E N4070-3 Trig S/N 763035
Made in U.S.A.- Note: Standard trig scales (6,12 divisions/degree)
Front Scale
K, A [ B, T, ST, S ] D, DI
Back Scale
DF [ CF, CIF, CI, C ] D, L
Note: One cursor block has KERCS.


S010 K&E 4070-3 Trig
K&E N4070-3 Trig S/N 717360
Made in U.S.A.- Note: Standard trig scales (6,12 divisions/degree)
Front Scale
K, A [ B, T, ST, S ] D, DI
Back Scale
DF [ CF, CIF, CI, C ] D, L


S303 K&E 4070-3 Trig
K&E N4070-3 Trig S/N 329774
Made in U.S.A.-
Front Scale:  Note: Standard trig scales (6,12 divisions/degree)
K, A [ B, T, ST, S ] D, DI
Back Scale
DF [ CF, CIF, CI, C ] D, L


REF K&E 4071 Clamshell Cursor - 'U' Brackets
K&E 4071 c.1909
Clamshell style metal framed glass indicator with 'U' shaped brackets
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
A [ B, C ] D
Back Scale: Note Scales on this side are all red.
A [ BI, CI ] D, L
Scan donated by Paul Tarantolo, Houston, Texas.


REF K&E 4071 Frameless Glass Cursor
K&E 4071 c.1915
Frameless glass indicator
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
A [ B, C ] D
Back Scale: Note Scales on this side are all red.
A [ BI, CI ] D, L
Scan donated by Paul Tarantolo, Houston, Texas.


REF K&E 4071-T (Trig) Clamshell Cursor
K&E 4071 (Trig) c.1911
Clamshell style metal framed glass indicator, L scale on edge.
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
A [ B, S, C ] D
Back Scale: Note Scales on this side are all red.
A [ BI, T, CI ] D || L
Scan donated by Paul Tarantolo, Houston, Texas.


REF K&E 4071-T Column Cursor
K&E 4071-T c.1913
Column framed cursor, moved L scale on face
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
A [ B, S, C ] D
Back Scale: Note Scales on this side are all red.
A [ BI, T, CI ] D, L
Scan donated by Paul Tarantolo, Houston, Texas.


REF K&E 4071-T All Glass Cursor
K&E 4071-T c.1915
Frameless all-glass cursor, moved L scale on face
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
A [ B, S, C ] D
Back Scale: Note Scales on this side are all red.
A [ BI, T, CI ] D, L
Scan donated by Paul Tarantolo, Houston, Texas.


S431 K&E 4071-T
K&E 4071-T
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale:  Note: Decimal trig scales (5, 10 divisions/degree)
A [ BI, T, CI ] D
Back Scale
A [ B, S, C ] D
Edge Scale: L


S304 K&E 4071-3 Polyphase Duplex DeciTrig
K&E N4071-3 Polyphase Duplex DeciTrig sn 841357
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale:  Note: Decimal trig scales (5, 10 divisions/degree)
K, A [ B, T Cot, ST, S  Cos ] D, DI
Back Scale
DF [ CF, CIF, CI, C ] D, L


K&E 4080-3 Log Log Duplex Trig c1947

ISRM 12.04.23.01
K&E 4080-3 Log Log Duplex Trig sn422987
Made in U.S.A - 1939-1949 scale set #2 (3rd Variation)
Front Scale: Note: 6,12 div/deg
LL0, LL00, A [ B, T, ST, S ] D, DI, K
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Original Owner (scratched intop braces): Jim England


K&E 4080-3 Log Log Duplex Trig c1948

ISRM 13.05.13.01
K&E 4080-3 Log Log Duplex Trig sn352343
Made in U.S.A - 1939-1949 scale set #2 (4th Variation)
Patents: Upper stock face RE.20,984;1,930,852;2,168,056;2,170,144;Pat.Pend. Cursor: 2,086,502
Front Scale: Note: 6,12 div/deg
LL0 ϵ-.001 to ϵ-.1, LL00 ϵ-1 to ϵ-10, A [ B, T, ST, S ] D, DI, K
Back Scale
L, LL1 ϵ.01 to ϵ.1, DF [ CF, CIF, CI, C ] D, LL3 ρ to ϵ10, LL2 ϵ.1 to ρ
Note: Only K&E with 1939-1949 scale set #2 (4th variation), and Exponent range marks using Lunate Epsilon symbol (ϵ) on Log Log scales, as a calculation aid. The black LL labels have red Epsilon, the red LL labels have black Epsilon.


K&E 4080-3 Log Log Duplex Trig (1942)

ISRM 12.08.25.01

K&E N4080-3 S/N 838161
Made in U.S.A. by Keuffel & Esser Co., New York
Patents: Upper stock face RE.20,984;1,930,852;2,168,056;2,170,144;Pat.Pend. Cursor: 2,086,502
Front Scale: Note: 6,12 div/deg trig scales used in nautical navigation
LL0, LL00, A [ B, T Cot, ST, S Cos ] D, DI, K
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Note: Specimen has been reconstructed to halt deterioration of cursor and to replace broken lens.
Donated by Barbara Campbell of Livermore, CA, daughter of Reed W. Campbell
This slide rule was issued to Reed W. Campbell (1923-present) by the United States Naval Academy, Annapolis, MD, when he entered as a plebe in 1942. He scratched his initials in the stock along with aids on the Log scales. Mr. Campbell graduated from the US Naval Academy in June 1945. After his tour of duty in the Navy, he taught engineering at Grove City College in Pennsylvania and attended graduate school at the University of Pittsburgh. He became a licensed Professional Engineer. Mr. Campbell went on work for Air Products & Chemicals in 1960, rose to the head of design engineering department and retired in 1983.


REF K&E 4080-3 Log Log Duplex Trig

K&E N4080-3 S/N 798671
Made in U.S.A. circa 1949-1954
Front Scale: Note: 6,12 div/deg
LL0, LL00, A [ B, T Cot, ST, S Cos ] D, DI, K
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Original Owner: John Vincent Atanasoff, (1903-1995) Father of the First Digital Computer. The Atanasoff-Berry Computer was the world's first electronic digital computer which was built by John Vincent Atanasoff and Clifford Berry at Iowa State University during 1937-42. It incorporated several major innovations in computing including the use of binary arithmetic, regenerative memory, parallel processing, and separation of memory and computing functions. On October 19, 1973, US Federal Judge Earl R. Larson signed his decision following a lengthy court trial which declared the ENIAC patent of Mauchly and Eckert invalid and named Atanasoff the inventor of the electronic digital computer - the Atanasoff-Berry Computer or the ABC. This scan of one of his three slide rules at ISRM were provided by the Iowa State University Library, Atanasoff Archives.


K&E 4080-3 Log Log Duplex Trig c

ISRM 11.11.22.01
K&E N4080-3 S/N 470704
Made in U.S.A.- Scale set #3 (1947-1952)
Front Scale: Note: 6,12 div/deg
LL01, K, A [ B, T Cot, ST, S  Cos ] D, L, LL1
Back Scale
LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2
Original Owner: W.R. O'Neill marked on black Cardboard sleeve.
On flap: USN V-5 (the United States Navy V-5 preflight program during WWII)


S005 K&E 4081-3 Log Log Duplex Decitrig
K&E 4081-3 S/N 618580
Made in U.S.A. - Notice Black LL0 scales
Front Scale: Note: 5,10, 20 div/deg
LL00, LL0, A [ B, T Cot, ST, S Cos ] D, DI, K
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2


K&E 4081-3 Log Log Duplex Decitrig - 1948

ISRM 10.03.01.03


K&E sleeve Jean Jolkovski W8EGM\A8EGM 1948

K&E 4081-3 S/N 365785 1948
Made in U.S.A. - Notice RED LL0 scales
Front Scale: Note: 5,10, 20 div/deg
LL00, LL0, A [ B, T Cot, ST, S  Cos ] D, DI, K
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Original owner: Jean Jolkovski W8EMG\A8EMG (embossed on outside of sleeve). Jean Jolkovski, Ohio Univ. written inside flap Other name on flap: Brodie
Gifted by Martha H. Prince in memory of the John Prince Collection, Tuscon, AZ
Jean Jolkovski (1926- ), was issued this slide rule by the U.S. Government in 1948 after serving in WWII, as part of the G.I. Bill while attending Ohio University. Unfortunately it was stolen in 1949, and he hadn't seen it since. In 2010 Martha Prince donated the slide rule, which was part of her late husband, John Prince's extensive collection to ISRM. In the process of doing some restoration, the ISRM curator looked at the sleeve and noticed there was an Amateur 'Ham' Radio call sign W8EGM\A8AGM on the sleeve. The curator, also a Ham KI0CC, discovered that a Jean Jolkovski was residing in Phoenix, AZ and is still involved in Ham radio with a call sign of W4CIH. When contacted, Jean affirmed that it was his. After this was stolen, Jean paid $20 out of his pocket for a new one as the G.I. Bill only issued one/veteran going to college. Jean received a BS in Electrical Eengineering and MSA in Information Technology and had a career Federal Government contract law. Over 50 years in Government contracts for technology and services. Small business a specialty. Public speaker; workshops on "Doing Business with the Government" , "How to write a winning proposal" and related subjects. Hands-on counselor. As of 2014, Jean is 87 and is an active SCORE mentor. He is the vice president of the Quarter Century Wireless Association Chapter 16 - Barry M. Goldwater Arizona Chapter.


S536 K&E N4081-3 Log Log Duplex Decitrig
K&E N4081-3 S/N 602728
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale: Note: 5,10, 20 div/deg
LL01, L, K, A [ B, T Cot, ST, S Cos ] D, DI, L1
Back Scale
LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2
Mr. Glen Williams was born November 4, 1918 in Adelaide, South Australia. Graduated from University of Detroit, BME, 1952.  Lt in the U.S. Army. Registered Professional Engineer. Board of Governors 1960-61 of Michigan Chapter of American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHVE).  Employed by Carrier Corporation since 1952 in engineering and sales capacities. Died September 13, 2004 in Americus, Georgia. Click for More Pictures


S014 K&E N4081-3 Log Log Duplex Decitrig (1954)
K&E N4081-3 S/N 660187 (1954)
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale: Note: 5,10, 20 div/deg
LL01, L, K, A [ B, T Cot, ST, S Cos ] D, DI, L1
Back Scale
LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2


K&E 4081-3 Log Log Duplex Decitrig (1952)

ISRM 13.08.27.01
K&E 4081-3 S/N 717411 (1952)
Made in U.S.A. Note ST scale, mahagony and celluloid edges
Patents on lower stock edge: US 2,168,056;2,170,144;2,422,649;2,500,460;2,285,722
Front Scale: Note: 5,10, 20 div/deg
LL01, K, A [ B, T Cot, ST, S Cos ] D, L, LL1. (Note: ' and " gauge marks on ST scale)
Back Scale
LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2
Note: ST scale changed to SRT in 1955
Original Owner: Anderson, marked on inside of sleeve flap
Gift of Arthur Anderson, Boulder, Colorado
Art bought this slide rule as a freshman at Rensselaer Polytechnic Institute in Troy, New York in 1952. RPI is the United State's oldest technological university.


K&E 4081-3 Log Log Duplex Decitrig (1955-1962)

ISRM 10.03.01.01
K&E 4081-3 S/N 2266 (1955-1962)
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale: Note: 5,10, 20 div/deg
LL01, L, K, A [ B, T Cot, SRT, S Cos ] D, DI, LL1
Back Scale
LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2
Note: ST scale changed to SRT in 1955. Note the SRT stamp on the box label, indicating the change from the ST scale on prior models. A 1957 K&E Receipt shows $29.95(USD). A later price written on the box shows $25.00(USD).
Donated by Martha H. Prince in memory of John Prince, Tuscon, AZ

Retail Box End

1957 Receipt
K&E Brochure: A Slide Rule With Intellect And Horse Sense (2.31MBpdf)


REF K&E 4082-3 Log Log Duplex Decitrig With F Scale
K&E 4082-3 Log Log Duplex Decitrig With F Scale
Made in U.S.A. - sn 769826
Front Scale:
LL0, LL00, A [ B, T Cot, ST, S Cos ] D, DI, F
Back Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Archive - Scan Donated by BajaRon sliderulecentral.com

Sleeve with Magnifying Cursor.


K&E N4083-3S Log Log Duplex Vector 1948

ISRM 2009.10.27.01


Vern with a Saturn 1B (1969) and with Mike Konshak(2009) shown donating his personal slide rule to ISRM.

K&E N4083-3 Log Log Duplex Vector S/N 485861 1948
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale: Note: 5,10, 20 div/deg
L, LL01, LL1, A [ B, T Cot, ST, S Cos ] D, Th, Sh2, Sh1
Back Scale
LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2
Donated by Vernon Estes, Canyon City, Colorado.. Founder of Estes Industries who made the first safe black powder rocket motors in 1958 used by members of the newly formed National Association of Rocketry (NAR) . Vern purchased this slide rule in downtown Denver, Colorado in 1948 when he was in his 3rd year at Westminster Union High School. He used it for advanced math classes in high school, then later at Central College in McPherson, Kansas. He later founded Estes Industries which began his career in model rocketry. He says "my trusty slide rule was an indispensible companion". Based on his own experiences, he offered slide rules (see the Pickett 120) in his sales literature (circa 1964) to help young rocketeers (of which the curator of ISRM was one). Vern engraved his name on the slide rule so it would not get mixed up with his brother Earl Estes' slide rule, who bought his at the same time and later used it in his engineering career at Hughes Aircraft.


S013 K&E 4083-3 Log Log Duplex Vector (1952-1956)
K&E 4083-3 S/N 914944
Made in U.S.A. by Keuffel & Esser Co., New York
Note: 1952-56 scale set. Inlaid mahogany edges. Front Scale: Note: 5,10, 20 div/deg
Sh1, Sh2, Th, A [ B, T Cot, ST, S Cos ] D, DI, LL01, LL1
Back Scale
LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2


K&E_4083-3 Log Log Duplex Vector sn475632 1961

ISRM 13.05.05.02
K&E 4083-3 Log Log Duplex Vector sn475632 1961
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale: Note: 5,10, 20 div/deg
Sh1, Sh2, Th, A [ B, T Cot, SRT, S Cos ] D, DI, LL01, LL1
Back Scale
LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2
Note 1: ST scale label changed to SRT in 1955. Note 2: the Th, Sh1 and Sh2 scales are back on the upper stock as it was in 1938-1947. The N4083-3 1948-1954 versions has them on the upper stock
Note 3: notice the rivet position on the cursor tension spring as compared to the N4083-3 1948 version above.
Original Owners (Marked on sleeve flap): David Wells, Jerry Wells, "Fred's Rule"



K&E 4088-1 Polyphase Pocket Duplex
ISRM 13.11.22.01
K&E 4088-1 S/N 540371 Polyphase Pocket Duplex 1923
Made in U.S.A.- All Glass Cursor
Front Scale: K, A [ B, S, T, CI ] D, L
Back Scale: DF [ CF, CIF, C ] D
Original Owner: Snodgrass, given as a Christmas gift in 1923. Later owned by O. Rittmaster, R.E 4296
Sleeve stamped: 'XMAS 1923' a gift from the 'McKINNEYS', for a young Mr. SNODGRASS.


REF K&E 4088-2 (Column Cursor)
K&E 4088-2 - patent Dec 22, 1908
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
K, A [ S, T, CI, ] D, L
Back Scale
DF [CF, CIF, C ] D
Scan donated by Clay Castleberry, California


S332 K&E 4088-2
K&E 4088-2 Production #63 1913-1921
Made in U.S.A. - 8" scales - All Glass Cursor
Front Scale
K, A [ S, T, CI ] D, L
Back Scale
DF [ CF, CIF, C ] D
Original Owner: Les Moore, MI - Tool and Die Maker


S310 K&E 4088-2
K&E 4088-2 S/N: none 1913-1921
Made in U.S.A. - 8" scales - All Glass Cursor
Front Scale
K, A [ S, T, CI ] D, L
Back Scale
DF [ CF, CIF, C ] D
Original Owner: H.I.W


S412 K&E 4088-3
K&E 4088-3 Column Cursor c1913-1915
Made in U.S.A. - Column Cursor - No B scale
Front Scale
K, A [ S, T, CI ] D, L
Back Scale
DF [ CF, CIF, C ] D
Original Owner: D.H. Wilson, N 40 Encino, Stanford University, Calif. (on case)
Scan donated by Clay Castleberry, California


K&E 4088-3 Polyphase Duplex

ISRM 13.06.25.06

Norma Tanner with Pickett Teaching slide rule
K&E 4088-3 Polyphase Duplex, Production #38
Made in U.S.A. - All Glass Cursor - c1913-1921
Front Scale
K, A [ S, T, CI ] D, L
Back Scale
DF [ CF, CIF, C ] D
Gifted by Norma Tanner of Libertyville, Illinois
Norma has been a participant of the ISRM Slide Rule Loaner Program. In addition, she had her own collection that she loaned out to students. This one is part of the collection sent to ISRM. Norma writes: "After teaching math and/or science for 24 years, I am now enjoying retired life. Having been educated at MIchigan State University during a time when using a slide rule was the only technology available for advanced calculations, I decided to create a unit of study for my students that would introduce them to the slide rule. My goals were for students to strengthen their ability to estimate and use scientific notation, as well as to discover the historic significance of the slide rule. While it was hard for them to put aside their electronic calculators, they were fascinated, engaged, and thrilled when they could multiply 2 x 3 and actually get 6 instead of 5.9. In the end my students were happy to be reunited with their calculators, but had a new appreciation for the value of estimating, scientific notation, and accuracy in measurement. Goals met! "


REF K&E 4088-3

K&E 4088-3 No S/N c1915 (Replacement Cursor c1935)
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
K, A [ S, T, CI ] D, L
Back Scale
DF [ CF, CIF, C ] D
This slide rule belonged to Linus Carl Pauling [1901-1994], one of the most influential chemists in history as well as one of the most important scientists of the 20th century. One of only 4 individuals ever to have won solo Nobel Prizes in separate and unrelated fields - for chemistry in 1954, and the Nobel Peace Prize for his tireless campaign against atmospheric nuclear bomb testing in 1962. He found this slide rule when he was 17 while still in high school. When the rightful owner was not found, he carried this with him to Oregon State College and used it until he graduated. See his diary page on the left, dated September 23, 1917. The cursor must have been replaced later as that type was not available until 1935. Images courtesy of Oregon State University Library Special Collections


K&E 4088-3 (1915-1921 with 1936 Cursor)

ISRM 11.11.05.01
K&E 4088-3 No S/N c 1915 Replacement Cursor c1936
Made in U.S.A. - Improved Cursor, no B scale
Front Scale
K, A [ S, T, CI ] D, L
Back Scale
DF [ CF, CIF, C ] D
Previous Owner: Sheldon Hart


S438 K&E 4088-3 (1922-1934)
K&E 4088-3 S/N 120356
Made in U.S.A. - All Glass Cursor.
Note: Scale labels use Times Romans" font.
Front Scale
K, A [ B, S, T, CI ] D, L

Back Scale
DF [ CF, CIF, C ] D

Original Owners - On SR: B.Y.K., Sleeve: A.B.Muller


K&E 4088-3 (1922-1934)

ISRM 13.07.03.28
K&E 4088-3 S/N 357810
Made in U.S.A. - All Glass Cursor
Front Scale: Note: Scale fonts changed. see previous 4088-3's
K, A [ B, S, T, CI ] D, L
Back Scale
DF [ CF, CIF, C ] D
Original Owner: Gold stamped Lawrence Haner leather sleeve.
Donated by Daniel Swerdlow, Bethesda, Maryland
.


K&E 4088-3 Flanged All Glass Cursor (1933-1935)

ISRM 11.10.30.01
K&E 4088-3 - sn406555
Made in U.S.A. - All Glass Cursor, Flanged Plastic Blocks - 1933-1935
Front Scale (added B scale in 1922)
K, A [ B, S, T, CI ] D, L
Back Scale
DF [ CF, CIF, C ] D
Original Owner: A.C. Funk


K&E 4088-3 Polyphase 1936-1939

ISRM 13.07.03.13
K&E 4088-3 Polyphase S/N 407724
Made in U.S.A. 1936-1939
Front Scale
K, A [ B, S, T, CI ] D, L
Back Scale
DF [ CF, CIF, C ] D
Donated by Daniel Swerdlow, Bethesda, Maryland


REF K&E 4090 Prototype
K&E 4090 Prototype - 1899
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale: A [ B, C ] D [ C, S ]
Back Scale: A [ BI, CI ] D [ CI, L, T ] D
Archive - Herman van Herwijnen SRC


REF K&E 4090 Universal
K&E 4090 Universal - 1899
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale: A [ B, C ] D [ C, S ]
Back Scale: A [ BI, CI ] D [ CI, L, T ] D
Archive - Herman van Herwijnen SRC


REF K&E 4090 Universal (attached slides)
K&E 4090 Universal- 1901/1903
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale: A [ B, C ] D [ C, S ]
Back Scale: A [ BI, CI ] D [ CI, L, T ] D
Archive - Herman van Herwijnen SRC


K&E 4090-3 Log Log Duplex Trig 1936

ISRM 12.10.07.01
K&E 4090-3 Log Log Duplex Trig 1936 S/N 502283
Made in U.S.A. - Improved Cursor (suffering from KERCS)
Front Scale
L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Back Scale
LL0, A [ B, K, CI ] T Cot , S2 Cos, S1
Note: The CI scale and Improved Metal Framed cursor was introduced on this model in 1936
Original owner: (Name written on case, Initials on stock): Henry S. Craumer (1917-2006) of New Jersey. He was a member of the faculty of Polytechnic University in Brooklyn, New York. Mr. Craumer retired to Raleigh, North Carolina where he died in 2006.


KE 4091-3 Log Log Duplex Decitrig sn460643 1933

ISRM 13.04.23.01
KE 4091-3 Log Log Duplex Decitrig sn460643 1933
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
LL0, A [ B, K, CI ] T, S2, S1
Back Scale
L, LL1, DF [ CF, CIF, CI , C ] D, LL3, LL2
Note: Has 1933 scale set, but a 1936 Improved metal framed cursor. In 1933-1935 the catalogs show the 4091-3 as having a Reinforced frameless glass cursors.


S011 K&E 4091-3 Log Log Duplex Decitrig 1934
K&E 4091-3 Log Log Duplex Decitrig S/N 487456 1934
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
LL0, A [ B, K, CI ] T, S2, S1
Back Scale
L, LL1, DF [ CF, CIF, CI , C ] D, LL3, LL2
Note: Has 1934 scale set, but a 1936 Improved metal framed cursor. In 1933-1935 the catalogs show the 4091-3 as having a Reinforced frameless glass cursors.


REF K&E 4092 Column Cursor (1914)
K&E 4092 Column Cursor
Made in U.S.A.
Patents: June 5, 1900, Dec 22, 1908
Front Scale
A [ B, S, C ] D
Back Scale
LL1, LL2, LL3 [ B, T, CI ] D, L
Scan donated by Clay Castleberry, California


REF K&E 4092 Log Log Duplex Lot 82 (1915)
K&E 4092 Log Log Duplex Lot 82 (1915)
Made in U.S.A. - All Glass Cursor with Netal Bars
Patents - Upper Stock: Pat. June 5 '00; Dec 22, '08. Cursor: Pat. 8.17.15
Front Scale
A [ B, S, C ] D
Back Scale
LL1, LL2, LL3 [ C, T, CI ] D, L
Scan donated by Clark McCoy Collection, California


K&E 4092 Log Log Duplex Lot 74 With Magnifier (1915)

ISRM 13.10.07.10
K&E 4092 Log Log Duplex Lot 74 (1915)
Made in U.S.A. - All Glass Cursor with Celluloid Bars
Patent Dates, as written - Upper Stock: Pat. June 5 '00; Dec 22, '08. Cursor: Pat. 8.17.15. Magnifier: 6-20-11
Front Scale
A [ B, S, C ] D
Back Scale
LL1, LL2, LL3 [ C, T, CI ] D, L
Note that one lens was severely broken and was replaced with one fabricated from a plastic lens used on Scientific Instruments slide rules. It has a red hairline.


KE 4092 Log Log Duplex lot86 (or 98) 1916-1921

ISRM 13.04.12.01
K&E 4092 Log Log Duplex lot86 (or 98) 1916-1921
Made in U.S.A. - All Glass Cursor with celluloid bars
Patents - Lower Stock: Pat. June 5 '00; Dec 22, '08. Cursor: Pat. 8.17.15
Front Scale
A [ B, S, C ] D
Back Scale
LL1, LL2, LL3 [ C, T, CI ] D, L
Note variance in scales to later models, which also had 'Made In USA' stamped on lower stock
Original owners (marked on stock and sleeve flap: Eli A. Anderson


S068 K&E 4092-3 (1922)
K&E 4092-3 S/N 5983
Made in U.S.A. - All Glass Cursor (1922) with serial number and "Made In U.S.A." stamp
Patents - Upper Stock: Pat. June 5 '00; Dec 22, '08. Cursor: Pat. 8.17.15
Front Scale
LL0, A [ B, S, T, C ] LL3, LL2, LL1
Back Scale
DF [ CF, CIF, CI, C ] D, L


K&E 4092-3 (1924 w/ 1937 Cursor)

ISRM 11.11.11.05
K&E 4092-3 S/N 443623
Made in U.S.A. - Improved 1936 Replacement cursor with serial number and "Made In U.S.A." stamp
Patents - Lower Stock: Pat. April 1, '24; Other Pat. Pending; Cursor: 2,086,502 (July 6,1937)
Front Scale
LL0, A [ B, S, T, C ] LL3, LL2, LL1
Back Scale
DF [ CF, CIF, CI, C ] D, L
Previous Owner(s): On sleeve: G. Higgings, Ewing.


K&E 4092-3 (1926)

ISRM 14.01.07.01
K&E 4092-3 S/N 149442
Made in U.S.A. - All Glass cursor
Patents - Lower Stock: Pat. June 5 '00; Dec 22, '08; April 1, '24; Cursor: Pat. 8.17.15
Note: Scale label text is in Times Roman Font as shown:
Front Scale: LL0, A [ B, S, T, C ] LL3, LL2, LL1
Back Scale: K, DF [ CF, CIF, CI, C ] D, L


S535 K&E 4092-3 (1926)
K&E 4092-3 S/N 187247
Made in U.S.A. - All Glass cursor - Used 1926-1930
Patents - Lower Stock: Pat. June 5 '00; Dec 22, '08; April 1, '24; Cursor: Pat. 8.17.15
Note: Scale label text is in Times Roman Font as shown:
Front Scale: LL0, A [ B, S, T, C ] LL3, LL2, LL1
Back Scale: K, DF [ CF, CIF, CI, C ] D, L
Parker D. Shepperd (1909-1963) used this slide rule between 1926-1930 at the University of Colorado in Boulder. Graduated 1930 with a mechanical engineering degree. Case has student's address at 1221 University, Boulder, CO, a fraternity house near the campus. Mr Shepperd worked in various firms designing commercial HVAC systems, such as General Electric in Schenectady, NY, and Johnson Service Company in Detroit, Cleveland, and Boston. One of his big projects was the John Hancock Building in Boston. Slide rule donated by his daughter, Marnie, and has now been permanantly transferred, with other items, to the University of Colorado Heritage Center.


K&E 4092-3 (1924)

ISRM 04.04.23.02
K&E 4092-3 S/N 256159
Made in U.S.A. - All Glass Cursor
Patents - Lower Stock: Pat. June 5 '00; Dec 22, '08; April 1, '24; Cursor: Pat. 8.17.15
Front Scale
LL01, A [ B, S, T, C ] LL3, LL2, LL1
Back Scale
K, DF [ CF, CIF, CI, C ] D, L
Note: Retrofit one cursor glass with plastic lens from S.I.C. cursor which has a red hairline.


K&E 4092-3 Log Log Duplex sn422878 (1935-1936)

ISRM 14.01.01.01
K&E 4092-3 Log Log Duplex sn422878
Made in U.S.A. - Reinforced All Glass Cursor
Patents - Lower Stock: Pat. April 1, '24; Other Pat. Pending; Cursor: Pat. 8.17.15
Front Scale: K, DF [ CF, CIF, CI, C ] D, L
Back Scale: LL0, A [ B, S, T, C ] LL3, LL2, LL1
This slide rule belonged to Robert J.Olson (1913-2006) Robert was employed as a Sales Representative for West Virginia Pulp and Paper from the 40's through the 1970's. He used this slide rule in calculations of thousands of huge rems of paper in his dealings with printing companies. In 1969 the company was renamed Westvaco Corporation. In 2000 it was merged with Mead Corporation (an earlier distributor of slide rules). Olson photo and biography provided by Ana E. Olson, Robert Olson's daughter-in-law


ISRM K&E 4092-3S (1937)

ISRM 10.03.01.01
K&E 4092-3S S/N 526892
Made in U.S.A. - New Improved Cursor (older celluloid compound with KERCS)
Patents - Lower Stock: Pat. 1,488,686 (April 1, 1924) - 1.930,852 (Oct 17, 1933); Cursor: 2,086,502 (July 6,1937)
Front Scale
LL0, A [ B, S, T, C ] LL3, LL2, LL1
Back Scale
K, DF [ CF, CIF, CI, C ] D, L
Original Owner, Marked inside sleeve: J.Stonich Jr., Aluminum Co. of America, no 6 Michigan Ave, Chicago, Illinois
Donated by Robert C. Eaton, Boulder, CO.


K&E 4092-3 (1937)

ISRM 11.11.07.01
K&E 4092-3 S/N 515790 (1937)
Made in U.S.A.
Patents - Lower Stock: Pat. 1,488,686 (April 1, 1924) - 1.930,852 (Oct 17, 1933); Cursor: 2,086,502 (July 6,1937)
Front Scale
LL0, A [ B, S, T, C ] LL3, LL2, LL1
Back Scale
K, DF [ CF, CIF, CI, C ] D, L
Previous Owner(s): Names on sleeve: David L. Fort, Russ Hignite, Wm. Hignite


K&E 4093-3 Log Log Duplex Vector (1930)

13.07.03.31
K&E 4093-3 Log Log Duplex Vector S/N 322624
Made in U.S.A. - with reinforced all glass Cursor - 1916-1933
Front Scale: L, LL0, DF [ CF, B, CI, C ] D, LL3, LL2
Back Scale: Sh1, Sh2, Th [ SI1, SI2, TI  TI ] D, S, T
Gift of Dan Swerdlow, Bethesda, Maryland.
This slide rule was originally manufactured in 1930 with an all-glass cursor, which was very fragile. When the new improved metal framed cursor came out in 1936, it was replaced. Unfortunately, the first celluloid blocks suffered KERCS and 50 years later they crumbled. ISRM restored this slide rule using a Ricoh 'look-a-like' OEM cursor made in Japan in 1960. See the comparison. This cursor may be seen on SIC 153, Lafayette F686, Mocronta 150/157 and many others. It is a compatible swap for all the K&E and Dietzgen 10inch Duplex slide rules including the 20inch duplexes, like the 4081-5. You just have to decide if the Relay/Ricoh bamboo slide rule is more valuable to you than your old mahogany K&E.


S263 K&E 4093-3 Log Log Duplex Vector
K&E 4093-3 Log Log Duplex Vector S/N 489831
Made in U.S.A. - Improved Cursor
Front Scale
L, LL0, DF [ CF, B, CI, C ] D, LL3, LL2
Back Scale
Sh1, Sh2, Th [ SI1, SI2, TI  TI ] D, S, T


K&E 4093-3 Log Log Duplex Vector 1936

ISRM 13.07.03.26


1933 Insert with owner's notes on vector scale ranges

Note of interest: Read Clark McCoy's Review of Bill Robinson's article Mendell Penco Weinbach and the K&E Log Log Vector Slide Rules on the development of the 4093, which migrated to the popular designs, like the 4081, that led K&E through the 1970's.
K&E 4093-3 Log Log Duplex Vector sn549118
Made in U.S.A. by Keuffel & Esser Co., New York
Note: New Improved Cursor replaced the all-glass cursor 1936.
Front Scale
L, LL0, DF [ CF, B, CI, C ] D, LL3, LL2
Back Scale
Sh1, Sh2, Th [ SI1 (5.74°-0.575°), (84.28°-89.425°), SI2 (90°-5.74°), (455.72°-84.28°), TI (45°-84.28°)TI (45°-5.72°)] D, S (5.72°-90°), T (5.72°-45°)
Has brown leather sleeve with missing flap
Donated by Daniel Swerdlow, Bethesda, Maryland
Note: The Sh1, Sh2 and Th scales are in Radians
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.


S043 K&E 4094
K&E 4094 S/N 730837
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
Inch // DF [ CF, CI, C ] D || Cm
Back Scale: Blank


REF K&E 4095 Triangular Metal
K&E 4095 Triangular Metal
Made in U.S.A. by Keuffel & Esser Co., New York
Scale 1:
Scale 2:
Scale 3:
Archive - Herman van Herwijnen SRC
K&E 4095-3 Merchant Rule
ISRM xx.xx.xx.xx
See K&E Specialty Slide Rule gallery


P241 K&E 4097
K&E 4097 S/N 11765
Made in U.S.A. - Note: metal billet cursor spacers
Front Scale
DF [ CF, CI, C ] D
Back Scale
5in [ blank ] 13cm
Original Owner: B. B. Haenxl (on case)

K&E 4097-B
ISRM 14.01.10.05
K&E 4097-B S/N 92902
Made in U.S.A. - Note: celluloid cursor spacers
Front Scale
DF [ CF, CI, C ] D
Back Scale
5in [ blank ] 13cm
Donated by Bill Wehrend Collection, Palo Alto, California.


P111 K&E 4097-C
K&E 4097-C S/N 40001
Made in U.S.A. - Note: metal billet cursor spacers
Front Scale
A [ B, CI, C ] D, K
Back Scale
5in [ S, L, T ] 13cm


P150 K&E 4097-C
K&E 4097-C sn 53942
Made in U.S.A. - note: Improved framed cursor
Front Scale
A [ B, CI, C ] D, K
Back Scale
5in [ S, L, T ] 13cm


P111 K&E 4097-D
K&E 4097-D sn 85986
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
A, DF [ CF, CI, C ] D, K
Back Scale
5in [ S, B, L, T ] 13cm


P222 K&E 4097-D
K&E 4097-D sn 142116
Made in U.S.A. - new Improved cursor
Front Scale
A, DF [ CF, CI, C ] D, K
Back Scale
5in [ S, B, L, T ] 13cm
Original Owner: Mrs. D.W. Morris, Dayton, Ohio


K&E 4098
ISRM 12.06.24.28
K&E 4098 S/N 27319
Made in U.S.A. - Metal cursor guides
Patwents: 1,875,927
Front Scale: A [ B, CI, C ] D, K
Back Scale: 5in [ S, L, T ] 13cm
Donated by the Huang Collection.
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.


P113 K&E 4098A
K&E 4098A S/N 24208
Made in U.S.A. - Celluloid cursor guides
Front Scale: A [ B, C ] D
Back Scale: 5in [ S, L, T ] 13cm
Back Adv: Fafnir Bearing
Original Owner: H.M.Nichols, B,F, Slurturvant Co.
K&E 4100 Stadia Rule See K&E Specialty Slide Rule gallery
K&E 4108 Military Slide Rule See K&E Specialty Slide Rule gallery
K&E 4110 Power Trig See K&E Specialty Slide Rule gallery
K&E 4132 Crane's Sewer Rule See K&E Specialty Slide Rule gallery
K&E 4133 Roy Lance Electrical See K&E Specialty Slide Rule gallery
K&E 4135 Engine Power Computing See K&E Specialty Slide Rule gallery
K&E 4139 Cooke Radio Rule See K&E Specialty Slide Rule gallery
K&E 4143 Kissam Stadia See K&E Specialty Slide Rule gallery
K&E 4160 Chemists Rule See K&E Specialty Slide Rule gallery


P003 K&E 4150-1
K&E 4150-1 S/N 026541 - Simplex
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
DF [ CF, CI, C ] D, L
Back Adv: 25th Annual Conf. Financial Analysts Federation May, 1972


P110 K&E 4153-1
K&E 4153-1 S/N 009565 - Simplex
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
A [ B, CI, C ] D, K
Back Slide: [S, L, T]
Original Owner: James M. White


P083 K&E 4161-1
K&E 4161-1 S/N 468310
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
K, DF [ CF, L, CI, C ] D, A
Back Slide
[ T, ST, S, C]
Back: blank


K&E 4161-3 Mannheim Type Ivorite Slide Rule

ISRM 14.01.10.41
K&E 4161-3 Mannheim Type Ivorite Slide Rule S/N 220819
Made in U.S.A.- all plastic stock
Front Scale
10inch // K, DF [ CF, L, CI, C ] D, A \\ 25cm
Back Slide
[ T, ST, S, C]
Back: Conversion Factors
Donated by Bill Wehrend Collection, Palo Alto, California.
K&E 4175 Kurtz Pyschrometric Rule See K&E Specialty Slide Rule gallery


K&E 4181-1 Log Log Duplex Decitrig

ISRM 09.01.12.51

Green Sleeve
K&E 4181-1 Log Log Duplex Decitrig S/N 003925
Made in U.S.A. - all plastic stock, all black scales
Front Scale (B2.. Artwork)
LL01, L, K, A [ B, T, ST, S ] D, DI, LL1
Back Scale (A1.. Artwork)
LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2
Donated by David Hecht Collection, Alexandria, Virginia


K&E 4181-1 Log Log Duplex Decitrig

ISRM 11.11.11.03

Air Products and Chemicals on Sleeve
K&E 4181-1 Log Log Duplex Decitrig S/N 133465
Made in U.S.A. - all plastic stock, Red and Black Scales
Front Scale (D1::.. Artwork)
LL01, L, K, A [ B, T Cot, ST, S Cos ] D, DI, LL1
Back Scale (C1:::. Artwork)
LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2
Donated by Carlee Heit in memory of her husband, Ray Heit Collection
Raymond Anthony Heit (1957-2003) earned a Civil Engineering degree from the University of Cincinnati, and was a Registered Civil Engineer in Ohio and Texas and a Licensed Surveyor in Ohio. Raymond had a creative and productive career at Factory Mutual, Inc., Union Carbide, Inc, and Kellog-Brown & Root, Inc. He also collected slide rules and slide charts, which now reside in the ISRM archives.


ISRM K&E 4181-3 Log Log Duplex Decitrig
K&E 4181-3 Log Log Duplex Decitrig s/n 004408
Made in U.S.A. - all plastic (trade name 'Ivorite') stock, plastic cursor lens.
Patents on slide: US 2,168,056;2,170,144;2,285,722
Front Scale (Artwork C:)
LL01, L, K, A [ B, T Cot, SRT, S Cos ] D, DI, LL1
Back Scale (Artwork A:::.)
LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2
Note: Green leather sleeve, no markings in Retail box
Box end


K&E 68-1100 Decilon 10

ISRM 13.06.28.04
K&E 68-1100 Deci-Lon 10
Made in U.S.A. - S/N 163425 (1962 and later)
Front Scale
Ln-3, Ln-2, Ln-1, Ln-0, A [ B, T Cot, SRT, S Cos, C ] D, DI, K
Back Scale
Sq1, Sq2, DF [ CF, CIF, L, CI, C ] D, Ln0, Ln1, Ln2, Ln3
Gifted by Ken Jackson of Boulder, CO.
Ken used this when he entered college in 1967 to study engineering. He switched major to accounting and finance. The slide rule was sitting in a box ever since.


K&E 68-1100 Decilon 10

ISRM 13.09.03.01
K&E 68-1100 Deci-Lon 10
Made in U.S.A. - S/N 318318 (1962 and later)
Front Scale
Ln-3, Ln-2, Ln-1, Ln-0, A [ B, T Cot, SRT, S Cos, C ] D, DI, K
Back Scale
Sq1, Sq2, DF [ CF, CIF, L, CI, C ] D, Ln0, Ln1, Ln2, Ln3
Donated By Richard Plastino, Lakewood, Colorado.
Richard Plastino originally used a Post slide rule for his engineering education at the University of Idaho from 1963 to 1967. The Post slide rule came to an unfortunate end after Richard received a grade of "20" on a statics exam and used the slide rule to strike a traffic sign a short distance outside the engineering building. This K&E was the replacement and both it and Richard made it the rest of the way through school with no smashing events. Dick retired in 2008 after serving as Public CWorks Director for the City of Lakewood, Colorado for 28 years.


K&E 68-1100 Decilon 10

Note: Models like this one was issued to U.S. Air Force Academy Cadets in Colorado Springs, CO. from 1966-1967. They started with Post Versalogs in 1958 and then went back to them in 1968.
K&E 68-1100 Deci-Lon 10
Made in U.S.A. - SN 225540 (1971)
Front Scale
Ln-3, Ln-2, Ln-1, Ln-0, A [ B, T Cot, SRT, S Cos, C ] D, DI, K
Back Scale
Sq1, Sq2, DF [ CF, CIF, L, CI, C ] D, Ln0, Ln1, Ln2, Ln3
Donated by Jeff Ilseman, Longmont, CO,
Jeff Ilseman was issued this slide rule in 1971 at the U.S. Military Academy at West Point. Jeff graduated with the class of '75, motto Courage and Drive, and has worked a Program Manager in the computer mass storage industry. Jeff is a generous supporter of ISRM with additional donations of 'Slide Rule Calculator's which he acquired while working at Texas Instruments, which can be seen in the Calculator Gallery


REF K&E 68-1100 Decilon 10 Variant
K&E 68-1100 Deci-Lon 10 Variant
Made in U.S.A. - S/N 256987 - no ridges on slide
Front Scale
Ln-3, Ln-2, Ln-1, Ln-0, A [ B, T Cot, SRT, S Cos, C ] D, DI, K
Back Scale
Sq1, Sq2, DF [ CF, CIF, L, CI, C ] D, Ln0, Ln1, Ln2, Ln3
Archive - Clark McCoy Collection


REF K&E 68-1100 Decilon 10 Late Variant
K&E 68-1100 Deci-Lon 10 Late Variant
Made in U.S.A. - S/N 206132 (1972 and later)
Front Scale
Ln-3, Ln-2, Ln-1, Ln-0, A [ B, T Cot, SRT, S Cos, C ] D, DI, K
Back Scale
Sq1, Sq2, DF [ CF, CIF, L, CI, C ] D, Ln0, Ln1, Ln2, Ln3
Archive - Ron Knapp Collection


K&E 68-1130 Decilon 5

ISRM 13.02.20.05
K&E 68-1130 Deci-Lon 5 S/N 043773 c1962-1975
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
Ln-3, Ln-2, Ln-1, Ln-0, A [ B, T Cot, SRT, S Cos, C ] D, DI, K
Back Scale
Sq1, Sq2, DF [ CF, CIF, L, CI, C ] D, Ln0, Ln1, Ln2, Ln3


S483 K&E 68-1210 Log Log Duplex Decitrig
K&E 68-1210 Log Log Duplex Decitrig S/N 310216 c1962-1975
Made in U.S.A.- Note like the early 4081-3 but re-labeled model#
Front Scale
LL01, L, K, A [ B, T Cot, SRT, S Cos ] D, DI, L1
Back Scale
LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2


S077 K&E 68-1251
Log Log Duplex Decitrig
K&E 68-1251 Log Log Duplex Decitrig S/N 127685 c1962-1975
Made in U.S.A. - Note like the early 4081-3 and later 68-1210  but all-plastic with a thinner stock.
Front Scale
LL01, L, K, A [ B, T Cot, SRT, S Cos ] D, DI, L1
Back Scale
LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2


ISRM K&E 68-1318 Log Log Duplex Trig (1962-1970)
K&E 68-1318 Log Log Duplex Trig S/N 360416
Made in U.S.A. - Note like the early 4080-3 with degree in minutes and seconds
Patents on lower stock: US 2,168,056;2,170,144;2,422,649;2,500,460;2,285,722
Front Scale
LL01, L, K, A [ B, T Cot, ST, S Cos ] D, DI, L1
Back Scale
LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2
Note: Tan leather sleeve with belt clip, no markings
K&E 68-1400 Analon 68-1400 Science Analysis See K&E Specialty Slide Rule gallery


REF K&E 68-1434 Log Log Duplex Vector

ISRM 09.01.12.52
K&E 68-1434 S/N 131170
Made in U.S.A. 1962-1975
Front Scale: Note: 5,10, 20 div/deg
Sh1, Sh2, Th, A [ B, T Cot, ST, S Cos ] D, DI, LL01, LL1
Back Scale
LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2
Original Owner: D.W. Millham
Donated by David Hecht, Ney York


K&E 68-1497 

ISRM 14.01.10.40
K&E 68-1497 Doric S/N 920128 - c1962-1975
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
K, A [ B, T Cot, SRT, S Cos ] D, DI
Back Scale
DF [ CF, CIF, CI, C ] D, L
Donated by Bill Wehrend Collection, Palo Alto, California.


P104 K&E 68-1555 Doric
K&E 68-1555 Doric S/N 044486 - c1962-1975
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
K, A [ B, ST, S ] D, T
Back Scale
DF [ CF, CI, C ] D, L


K&E 68-1565 GP12

ISRM 09.01.12.53
K&E 68-1565 GP12- Simplex S/N 011932
Made in U.S.A. - 1964
Front Scale
Sq1, Sq2, DF [ CF, T Cot,  SRT, S Cos, , CI, C ] D, A, K
Back Scale
cm (number) [ number, Conversions, logarithm ] inch (logarithm)
Donated by David Hecht, Alexandria, VA.


K&E 68-1617

ISRM 12.02.19.03
K&E 68-1617 S/N 750904 c1962-1975
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
10inch // A [ B, CI, C ] D, K \\ 25cm
Back Scale: [ T, L, S]
Back: Conversion Factors
Donated by Nancy Day, Kansas City, Missouri

William Bruce Day
Bruce was given this slide rule when he was in high school while his father, William M. Day, was stationed at Vandenburg AFB. It was given to him by an engineer working on the early phases of the Atlas Missile Project for Martin Marrieta. Bruce later became a career military officer who flew B-52 missions in Vietnam and later C130s as a member of the reserves, retiring as a Lt. Col. His civilian life was spent as a Patent and Trademark Attorny in Kansas City, where he still resides.


S504 K&E 68-1775
K&E 68-1775 S/N 860393 c1962-1975
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
10inch // DF [ CF, CI, C ] D \\ 25cm
Back Slide: Blank
Back: Conversion Factors


ISRM K&E 68-1892 K12 Prep
K&E 68-1892 K12 Prep c1964-1975
Made in U.S.A. - same as 4058
Front Scale
K, A [ B, S, CI T, C ] D, L
Back Blank
Note: Had a price written on Manual of $3.10
Warning: Only clean this model with water
This is not an engine-divided rule and the ink wipes off.
Donated By Scott Reynolds, (Vintage Calculators, Inc), Helmut, California


REF  K&E Doric- Celanese Celcon
K&E Doric- Celanese Celcon S/N 007039
Made in U.S.A.- Green Celcon Plastic
Front Scale
K, A [ B, ST, S ] D, T
Back Scale
DF [ CF, CI, C ] D, L
Archive - Not in Collection


K&E 9068 Doric Pocket Duplex - c1948-1952

ISRM 13.10.22.01

Instructions (14.5MB PDF)
Stephen Joseph Rosty (1921-2012).was born in Passaic, NJ to Stephen and Rose (Mikulski) Rosty. During WWII Stephen served in the US Navy aboard the USS Martin. In 1955 Stephen married Frances M. Wozniak, they were married for 56 years until her death on Oct 31, 2011. Stephen received his Masters Degree in Electrical Engineering from the Newark College of Engineering, Newark, NJ. He worked for Burroughs and Bendix Aviation Co., and then Singer-Kearfott Corp, Little Falls, NJ. He had two daughters, Rosanne Rosty and Roberta Rosty.
K&E 9068 Doric Pocket Duplex S/N 6027
Made in U.S.A. by Keuffel & Esser Co., New York
Patent shown on cursor block:2.086,502; On Stock: Pat. Pend.
Front Scale
K, A [ B, ST, S ] D, T
Back Scale
DF [ CF, CI, C ] D, L
Original owner: Stephen Joseph Rosty of Saddle Brook, New Jersey
Gift of Roberta Rosty, Saddle Brook, New Jersey
This slide rule, and another in the Frederick Post Gallery, belonged to Roberta's Father, Stephen Joseph Rosty (see biography on left). Roberta also worked in a technical field as she has 2 Patents: number 4,410,393 issued October 18, 1983Preparation of steel surfaces for adhesive bonding by etching with H.sub.3 PO.sub.4 -polyhydric alcohol mixture 4,835,016 Mar 28, 1988 Adhesive bonding. Both for The United States of America as represented by the Secretary of the Army.


ISRM K&E N9081-3 Doric
K&E N9081-3 Doric S/N 53602 - Duplex
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale
LL01, K, A [ B, T Cot, ST, S Cos ] D, L, LL1
Back Scale
LL02, LL03, DF [ CF, CI, C ] D, LLL3, LL2
Cursor has KERCS, reinforced with paper and epoxy


REF K&E N9081-3 Doric


Case with Astronaut Cooper's name
K&E N9081-3 Doric S/N 11767 - Duplex
Made in U.S.A. by Keuffel & Esser Co., New York
Front Scale (Not Shown)
LL01, K, A [ B, T Cot, ST, S Cos ] D, L, LL1
Back Scale (Shown)
LL02, LL03, DF [ CF, CI, C ] D, LLL3, LL2
This slide rule was owned by American Astronaut Gordon Cooper who purchased this in 1949 to use in flight school, then continued to use it during his Air Force and NASA career. Leroy Gordon Cooper, Jr. (1927-2004), also known as Gordon Cooper, was an American aeronautical engineer, test pilot and one of the seven original astronauts in Project Mercury, the first manned space program of the United States. Cooper piloted the longest and final Mercury spaceflight in 1963. The B&W NASA photo is from May 16, 1963, just after the successful recovery of the Mercury Faith-7 mission. He was the first American to sleep in space during that 34-hour mission and was the last American to be launched alone to conduct an entirely solo orbital mission. In 1965, Cooper flew as command pilot of Gemini 5.


K&E ECCO 10000 Pocket Duplex
K&E ECCO 10000 Pocket Duplex (same as K&E 9068 Doric)
Made in U.S.A. by Keuffel & Esser Co., New York
Patent shown on cursor block:2.086,205; (This is an error as it should be 2,086,502) On Stock: Pat. Pend.
Front Scale
K, A [ B, ST, S ] D, T
Back Scale
DF [ CF, CI, C ] D, L
Gift of Ed Millis Collection, Dallas, Texas.

K&E ECCO 10002 Duplex

Click here on How to Date a K&E


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