Wooden Box Model Comptometer

This key-driven non-printing adding machine has a wooden case and eight columns of color-coded plastic keys. It is a relatively late example of a Comptometer with a wooden (rather than a metal) case.
The key tops are flat and made of plastic. They are colored black and white, with complementary digits indicated in red. There is a spring around each key stem, and the stems become progressively longer as the digits increase. Eight subtraction levers are in front of the keys and eight decimal markers are attached to a metal plate painted black, which is in front of these. A row of nine windows in the plate reveals number wheels which represent totals and differences. The zeroing mechanism is a knob with a release lever on the right side.
The serial number, stamped on the front of the machine under the decimal markers, is 5021. A metal tag screwed to the top of the machine behind the keyboard is marked: TRADE COMPTOMETER MARK (/) PAT’D (/) JUL.19.87 JUN. 11. 89.(/) OCT.11.87 NOV.25.90 (/) JAN.8.89 DEC.15.91. (/) SEP.22.96 (/) Felt & Tarrant Mfg. Co. (/) CHICAGO
According to other records, this machine was sold in 1906 to H. Messersmith Company of Buffalo, New York, and traded in in 1910 for a Model C. The machine became part of the collections of Felt & Tarrant Manufacturing Company and was exhibited at the Century of Progress Exhibition in Chicago in 1933.
Compare to 1987.0107.04.
Felt & Tarrant, Accession Journal 1991.3107.06.
Currently not on view
Object Name
adding machine
date made
Felt & Tarrant Manufacturing Company
Physical Description
plastic (overall material)
wood (overall material)
metal (overall material)
overall: 13.3 cm x 20.8 cm x 36.4 cm; 5 1/4 in x 8 3/16 in x 14 11/32 in
place made
United States: Illinois, Chicago
ID Number
maker 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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