Archive of Collections

Details and Image

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

Notes: "The K&E 4088 slide rule was a combination of the scales from the Cox Duplex, and the S, L, T, and K scales from the single-sided “Polyphase” (4053) slide rule. It was introduced in 1913 and made until 1939. The 4088 did not originally have a B scale, that was added in 1922. The presence of the B scale and the frameless glass cursor indicate that this one was made between 1922 and 1936. "

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