The log log trig slide rule 1936 this instruction manual is for the 4091 3 4092 ke log log duplex slide rules ke aprox 1914 this instruction manual is for the 4092 and 4092 1 2 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. Started in 1867 slide rules were only a very small part of k es product offering which included everything from drafting paper to survey instruments and drafting aids k e held patents for a wide range of slide rule features including improved cursor indicators functions and scales and the adjustable body mechanism. Keuffel esser instruction manual for polyphase duplex slide rule description this 92 page salmon colored paperback book was received with 1981093303 its citation information is william e breckenridge the polyphase duplex slide rule a self teaching manual new york keuffel esser co 1924. We get this in two versions a green colored cover titled k e slide rules a self instruction manual and a tan colored cover with the jetlog title but the contents are the same generally very good condition but these are used copies and may have some minor marks or names inside by kells kern and bland
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