Archive of Collections



Details and Image



TypeModel No.MakerCountryConstruction
Material
DateScale LengthArea of Use
Linear
Keuffel & Esser / 9068 Doric
Keuffel & Essor
USA
Plastic
1949-1952
10 cm
Engineering

Notes: "The K&E Model 9068 Polyphase Duplex slide rule first appeared in 1949, in a price list for the 1944 K&E catalog, not in a new catalog. The 9068 model number did not last long; by 1952 it was listed as the 4168 (formerly 9068) in a K&E educational products catalog. So, dating this rule is sorted out. The 4168 slide rule was made all the way up to 1972, although by then its model number had changed once again."


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