Comptometer Model J

Description
This key-driven adding machine had ten columns of color-coded green and white plastic keys. Complementary digits were indicated on the keys, and they were alternately concave (for odd digits) and flat (for even digits). Another key stem is at the back to the right of the number keys. In front of the keys is a row of ten subtraction levers. In front of these is a row of ten numbered decimal markers. In front of these are windows in the metal case that reveal 11 number dials, that indicate the result of addition.
The machine is marked on the front top at the left: J329139. It is marked on the front: Comptometer. It is marked on a sticker on the left side: DEPARTMENT OF AGRICULTURE (/) 89699-BAE.
This instrument came to the Smithsonian from the U.S. Department of Agriculture.
Reference:
Felt & Tarrant, Accession Journal 1991.3107.06
Location
Currently not on view
date made
1935
maker
Felt & Tarrant Manufacturing Company
place made
United States: Illinois, Chicago
Physical Description
wood (overall material)
metal (overall material)
plastic (overall material)
Measurements
overall: 14 cm x 27.5 cm x 37.5 cm; 5 1/2 in x 10 13/16 in x 14 3/4 in
ID Number
MA*328128
maker number
J329139
catalog number
328128
accession number
270163
Credit Line
Transfer from US Department of Agriculture
subject
Mathematics
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Adding Machines
Data Source
National Museum of American History, Kenneth E. Behring Center

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