The Binary Slide Rule
£60
Dimensions
21 cms diameter
Circa
1940
Country of manufacture
North America
Description
An example of celluloid circular slide rule made by the ‘Gibson Slide Rule Co. Florida, USA. One side copyrighted 1940, the other side with scales for trigonometry copyrighted in 1931, in good condition with original soft leather wallet, and instruction booklet
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Dealer information
Fletcher
Fletcher Wallis
Fletcher Wallis sells objects and books relating to the history of science, medicine and technology Arcade. He publishes books through Vernier Press, including Antique Medicine Chests, and Corkscrew Patents from 1795. He has been dealing for forty eight years.
