Keuffel & Esser 4181-3 Log Log Duplex Decitrig Greg's Slide Rules
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Front Right

Back Left

Back Right

Keuffel & Esser 4181-3 Log Log Duplex Decitrig - Notes

  1. This rule is part of the Log Log Duplex Decitrig family of rules.
  2. The scale configuration on this rule was introduced in the 1954 catalog and the serial number is from about 1955.
  3. For a "plastic" rule this model has a wonderful feel, not quite as heavy as the equivalent 4081-3 it still seems to feel more solid than other plastic type rules.


Further details about this Slide Rule:

Brand Keuffel & Esser
Model 4181-3 Log Log Duplex Decitrig
Country of Manufacture USA
Scales Front LL02, LL03, DF [CF, CIF, CI, C] D, LL3, LL2
Scales Back LL01, L, K, A [B, T, SRT, S] D, DI, LL1
Number of Scales 21
Slide Rule Materials Ivorite
Cursor Materials Nylon/Metal/Plastic with metal screws
Cursor Lines 1 Front, 1 Rear
Scale Length 25 cm
Length 31.7 cm
Width 4.1 cm
Condition Good
Documentation None
Accessories Composite and leather case

Last updated: 2002-09-18 22:00 AEST
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