Make keuffel esser usa model log log duplex decitrig 68 1210 notes 1 this was one of the latest of the log log duplex decitrig family of rules an earlier one is the 4081 03 which has similar scale complement the range was introduced in 1937 the rules were made of celluloid on mahogany. The log log duplex decitrig slide rule with f scale 4082 3 ke this instruction manual is for the 4082 3 radio special slide rule that is a 2nd edition 4081 3 with a f scale replacing the k scale. Keuffel esser 4081 3 log log decitrig duplex slide rule keuffel esser 4081 3 log log decitrig duplex slide rule previous he moved on to the next college post was kes main competitor post slide rules had bamboo cores that provided very smooth movement important for precise settings hope this is of interest joe fisher. Keuffel esser 4081 log log duplex decitrig manual this manual was written for the k e 4081 series of rules but it covers most of the variations on that model a number of these models can be seen at my keuffel esser page. K e slide rules from one of americas premier manufacturers sphere research corporation 4081 3 log log duplex decitrig c1947 10 wood ll0 l k a leather case special manual completely unique rule and scale design with pysical constants on the scales
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