Comptometer Model A Section


This model has two columns of nine white plastic keys. Digits and complementary digits are indicated on the keys. Keys for odd digits are concave, those for even digits are flat. The mechanism is of steel and the two numeral wheels have white plastic rims. There are no subtraction levers, but there is a zeroing crank on the right. The entire model rests on a wooden base; there is no cover. The model was used as reference by Dorr E. Felt and J.A.V. Turck in developing the mechanism for production of the Model A Comptometer.


Felt & Tarrant, Accession Journal, 1991.3107.06.

Date Made: 1904

Maker: Felt & Tarrant Manufacturing Company

Location: Currently not on view

Place Made: United States: Illinois, Chicago

Subject: Mathematics

See more items in: Medicine and Science: Mathematics, Adding Machines, Science & Mathematics


Exhibition Location:

Credit Line: Gift of Victor Comptometer Corporation

Data Source: National Museum of American History

Id Number: MA.323643Catalog Number: 323643Accession Number: 250163

Object Name: adding machine section

Physical Description: steel (overall material)plastic (overall material)wood (overall material)Measurements: overall: 15.5 cm x 13.2 cm x 36 cm; 6 3/32 in x 5 3/16 in x 14 3/16 in


Record Id: nmah_690467

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