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Item#
Type
Model No.
Match No.
Variant No.
Model Name
Maker
Country
Production or Serial No.
Material
Scale Length
Date
Condition
KEU095
Cylindrical
4012
4005
n/a
Thacher Calculator
Keuffel & Esser
USA
4145
Brass with paper scales
"18"
1919
C5
Notes:
"Cylinder mounted inside a cage with paper scales, brass stand, and mahogany base. Resolution of calculations equivalent to a linear slide rule 720" long."
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Condition Code
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