Adding Machine Section, Burroughs Model 656

This is one of a series of adding machines and adding machine models prepared by the Patent Department of the Burroughs Adding Machine Company. It is a model of a steel mechanism for an adding machine that includes one column of eight white octagonal plastic keys (one key missing) and one numeral wheel with black plastic rim. Keys for odd digits are concave, and for even digits, flat. Complementary digits are indicated on the keys. A black metal piece covers part of the numeral wheel and has a window cut in it to show the number. A flat rod painted orange can be moved up to cover part of this window.
It is marked on a metal tag attached to the object: B.A.M.CO. (/) MODEL (/) No. 656. It is stamped on the side: 2A. 3 - 25 - ‘26 11 - 25 ‘25.
Objects 1982.0794.04 through1982.0794.10 were received together as Burroughs Patent model 42.
Currently not on view
Object Name
adding machine model
date made
ca 1925
Burroughs Adding Machine Company
Physical Description
plastic (overall material)
steel (overall material)
overall: 11.5 cm x 7 cm x 26.8 cm; 4 17/32 in x 2 3/4 in x 10 9/16 in
place made
United States: Michigan, Detroit
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 Burroughs Corporation

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