Adding Machine Section, Comptometer Model E

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This model of a section of a full-keyboard non-printing adding machine has two complete columns of keys and two partial columns. The partial columns are in the middle, and the total number of keys is 23. The key tops in the two right columns are white, and those on the left are black. Complementary digits are indicated. The keys are alternately concave (odd digits) and flat (even digits). The model also includes a mechanism, numeral wheels, three result windows, and three decimal markers. It has a glass case with a wooden base. Subtraction levers are between the rows of keys and a zeroing lever is on the right. Just in back of the digit keys, on the right, is a white key with a shorter key stem.
The model has a metal tag in the back of the keyboard with a list of patent dates. The last date is OCT.7.13. Some images of the model whow it with the incorrect catalog number 273177 painted on the front.
This machine was given to the Smithsonian in 1914 by Felt & Tarrant Manufacturing company.
Currently not on view
date made
ca 1913
Felt & Tarrant Manufacturing Company
place made
United States: Illinois, Chicago
Physical Description
steel (overall material)
plastic (overall material)
wood (overall material)
glass (overall material)
overall: 17.9 cm x 16 cm x 42.4 cm; 7 1/16 in x 6 5/16 in x 16 11/16 in
ID Number
catalog number
accession number
Credit Line
Gift of Felt and Tarrant Manufacturing Company
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Adding Machines
Data Source
National Museum of American History


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