Archive of Collections

Details and Image

TypeModel No.MakerCountryConstruction
DateScale LengthArea of Use
K & E /4088-3 Polyphase Duplex
Keuffel & Esser
Celluloid over wood
early 1900's
25 cm

Notes: "The K&E “polyphase” refers to a slide rule that has an inverted C scale, the almost ubiquitous CI scale. The 4088 Polyphase Duplex adds CF, DF, and CIF scales, to facilitate chain calculations. As its name implies, it is also a duplex slide rule, and calculations can carry from one side to the other if necessary. "

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