Keuffel & Esser 4081-3 (2) Greg's Slide Rules
Front Left

Front Right

Back Left

Back Right

Keuffel & Esser 4081-3 (2) - Notes

  1. I believe that this rule probably dates from roughly 1947, the serial number is too early for 1949 and the scale layout was changed in 1949. For K&E serial number dating use the link here to Ed Chamberlain's reference set of dating curves.
  2. This model differs only slightly from the 4080 series in that this model has the trigonometrical scales divided in degrees and decimals of a degree, whereas the 4080 series has these scales divided to represent degrees and minutes.


Further details about this Slide Rule:

Brand Keuffel & Esser
Model 4081-3 Log Log Duplex Decitrig
Country of Manufacture USA
Date of Manufacture c 1947
Scales Front L, LL1, DF [CF, CIF, CI, C] D, LL3, LL2
Scales Back LL0, LL00, A [B, T, ST, S] D, DI, K
Number of Scales 20
Slide Rule Materials Wood/Celluloid
Cursor Materials Metal/Glass
Cursor Lines 1 Front, 1 Back
Scale Length 25 cm
Length 31.7 cm
Width 4 cm
Condition Good
Documentation None
Accessories Leather and composite case

Last updated: 2002-09-28 22:00 AEST
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