Comptometer Section, Model F, 1/6 Fraction

This is an experimental model of a section of a full-keyboard non-listing adding machine. It has one column of five white plastic keys on the right, two partial columns of black keys in the center, and one column of nine black keys on the left. Complementary digits are indicated. The keys are alternately concave (odd digits) and flat (even digits). There are four numeral dials at the front, a zeroing lever on the right side, and a red button on the right behind the keyboard. The dial in the rightmost position is numbered zero to 5 and is slightly smaller than the others. There are two subtraction levers and no decimal markers. There is no base and no cover.
A mechanism to record fractional sixths or sixtieths, it was built at Felt & Tarrant Manufacturing Company in Chicago, but not produced. It was in the collections of Felt & Tarrant, and came to the Smithsonian from the successor firm of Victor Comptometer Corporation.
Accession Journal 1991.3107.06
Currently not on view
Object Name
adding machine section
date made
Felt & Tarrant Manufacturing Company
Physical Description
steel (overall material)
plastic (overall material)
wood (overall material)
overall: 14 cm x 15 cm x 35 cm; 5 1/2 in x 5 29/32 in x 13 25/32 in
place made
United States: Illinois, Chicago
ID Number
catalog number
accession 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
Additional Media

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