Keuffel & Esser 68 1318 Greg's Slide Rules
Front Left

Front Right

Back Left

Back Right


Keuffel & Esser 68 1318 - Notes

  1. I believe that this rule probably dates from roughly 1963, this is based on the serial number. For K&E serial number dating use the link here to Ed Chamberlain's reference set of dating curves.
  2. This is the progression from the 4080 series of rules using K&E's new numbering system. Refer to examples 1, 2 and 3 for other examples of this model.
  3. This rules differ only slightly from the 4081 series in that these rules have the trigonometrical scales divided in degrees and minutes, whereas the 4081 series has these scales divided to represent decimals of a degree.


Further details about this Slide Rule:

Brand Keuffel & Esser
Model 68 1318 Log Log Duplex Trig
Country of Manufacture USA
Date of Manufacture c 1963
Scales Front LL02, LL03, DF [CF, CIF, CI, C] D, LL3, LL2
Scales Back LL01, L, K, A [B, T, ST, S] D, DI, LL1
Number of Scales 21
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: 2002-10-06 22:00 AEST
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