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K&E 4093-3 Family of Slide Rules

 

An error has been noted on all of the 409x-3 series rules. The LL0 scale has an "e" at the beginning and end of the scale. It should be "e to the -1". This error was corrected by K&E between serial numbers 455535 and 460179. This correction appears to be coincident with the introduction of the New Improved Cursor. This serial number dating places this change at probably early 1935.

Scale set:

        4093-3 --- 10" Mahogany with laminated edges. Metal rimmed cursor. Serial # 429847