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Catalog Number C14.509
Title Ham's Mechanical Calculator
Object Name Calculator, Desk
Description A cylindrical mechanical weighing calculator, invented by Henry H. Ham, and patented April 8th, 1879. Consists of a japanned tin cylinder, with a celluloid viewing window. Numbers can be seen under the window. A small knob is found on the right side of the cylinder, which would turn the inner cylinder (knob does not function). Peeling paper label on outer cylinder reads, "Ham's Mechanical Calculator...", etc.
Date 1879
Year Range from 1878
Year Range to 1879
Dimensions H-4.5 L-9.75 Dia-4.375 inches
Material Tin, paper, celluloid
Place of Origin New England
Provenance From the Ham House in Portsmouth.
People Ham, Henry H., 1842-1914
Gallant, Kenneth
Search Terms
Subjects Calculators
Inventions