K e slide rule manual log log duplex decitrig no 4081 index of ke catalogs cross reference index index of ke collection ke slide rule manuals these manuals are provided for the collector researcher and slide rule student interested in ke slide probably my favourite slide rule manufacturer ke was the dominant slide rule maker in the us. The log log duplex trig slide rule no 4080 1937 this instruction manual is for the 4080 3 this is an early edition of the manual ke log log duplex slide rules ke after 1915 this instruction manual is for the 4092 and 4092 1 2 this is a later edition of the manual. 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. Included in the acquisition is a manual by william e breckenridge the log log duplex slide rule 1939 compare this rule to 2007018101 compare this rule to 2007018101 robert l huffman owned this instrument
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