Felt and Tarrant Comptometer, 1887.

Made:
c. 1900 in Chicago
manufacturer:
Felt and Tarrant Manufacturing Company
inventor:
Dorr Eugene Felt

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Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Comptometer, early form (wooden box), 72 keys numbered, plate on top of box engraved " Trade Comptometer mark, Patd. July 19th 1887, Oct 11th 1887, Jan 8th 1889, June 11th 1889, Nov 25th 1890, Dec 15th 1891, Felt & Tarrant Manufacturing Co., Chicago"

An early example of the Comptometer, with 72 numbered keys. The top of box has a plate engraved with varoius patents up to 1891. The Felt and Tarrant Comptometer was one of the first generation of mass-produced office calculators. It was extremely successful being able to multiply and subtract quickly and efficiently.

Details

Category:
Mathematics
Object Number:
1911-255
Materials:
brass (copper, zinc alloy), mahogany (wood), resin (unidentified) and steel (metal)
type:
calculating machines (full-keyboard)
credit:
Felt & Tarrant Manufacturing Company