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Details and Image
Type
Model No.
Maker
Country
Construction
Material
Date
Scale Length
Area of Use
Linear
K & E /40701T
Keuffel & Esser
USA
Celluloid over wood
1913-1915
25 cm
Engineering
Notes:
"Keuffel & Esser described the 4071T in their catalog as “Duplex Slide Rule, 10 in., like No. 4071 but with trig. scales.” True enough, this duplex slide rule has S and T scales. The column (or pillar) cursor dates it to 1913-1915. "
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