Details and Image
|Date||Scale Length||Area of Use
|Linear||Keuffel & Esser / 4088-2||Keuffel & Essor ||USA||Plastic over wood||1915-1922||10 cm||Engineering
Notes: "The K&E 4088 Polyphase Duplex slide rule, in various lengths, was made from 1913 until 1939. This is the 4088-2, or 8-inch version, and was made sometime between 1915 and 1922, based on the cursor type and the lack of a B scale. "