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Victorian slide rule

Cylindrical slide rule in a mahogany box with a hinged lid. Designed by engineer Edwin Thacher (1839-1920) and patented in 1881. Manufactured by Keuffel & Esser Company; used by the Northern Pacific Railway.

 

Featured on the Minnesota Historical Society's Collections Up Close blog on February 13, 2012 (the link will not be viable until that date).

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Taken on August 17, 2011