Comptometer Model C, British Currency

This model of an adding machine section has a single black key “1” key, with a complementary 0 digit, in the rightmost column. Left of this is a column of nine white keys. Keys for odd digit keys are concave, and those for even digits are flat. Three numeral wheels are at the front. The rightmost has alternate zeros and ones, and the two to the left both have the digits from 0 to 9. There is a handle on the right side. There is no case. The keys apparently could be used to add shillings (there being 20 to a pound).
This object came to the Smithsonian from Victor Comptometer Corporation, the successor firm to Felt & Tarrant Manufacturing Company.
Accession Journal 1991.3107.06.
British Patent No. 5387 to Dorr E. Felt, applied for March 5, 1909, and granted June 6, 1910.
Currently not on view
Object Name
adding machine section
date made
Felt & Tarrant Manufacturing Company
Physical Description
metal (overall material)
plastic (overall material)
wood (overall material)
overall: 14 cm x 11.1 cm x 35.8 cm; 5 1/2 in x 4 3/8 in x 14 3/32 in
place made
United States: Illinois, Chicago
ID Number
accession number
catalog number
Science & Mathematics
Adding Machines
See more items in
Medicine and Science: Mathematics
Adding Machines
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Victor Comptometer Corporation

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