Archive of Collections



Details and Image



TypeModel No.MakerCountryConstruction
Material
DateScale LengthArea of Use
Linear
Keuffel & Esser /4061
Keuffel & Essor
USA
Plastic over wood
1915-1920
10 cm
Engineering

Notes: "The K&E model 4061 5 slide rule is the shorter version of the 4071, which was the successor to the original Cox Duplex. The 4061 is unusual in that it has 320 divisions on the C and D scales, the same as a typical 10 slide rule. This makes the 4061 the 5 equivalent of one of K&Es F 10 slide rules, with fine divisions. The utility of these very fine divisions is questionable (the smallest spacing between tick marks is 0.011, and the cursor hairline would be 0.004 to 0.006 wide). This 4061 would have come from 1910 to 1920, and since the cursor is missing, probably 1915 to 1920, when the fragile all-glass cursor was in use. "


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