Comptometer Model A Section

Description
This model has two columns of nine white plastic keys. Digits and complementary digits are indicated on the keys. Keys for odd digits are concave, those for even digits are flat. The mechanism is of steel and the two numeral wheels have white plastic rims. There are no subtraction levers, but there is a zeroing crank on the right. The entire model rests on a wooden base; there is no cover. The model was used as reference by Dorr E. Felt and J.A.V. Turck in developing the mechanism for production of the Model A Comptometer.
Reference:
Felt & Tarrant, Accession Journal, 1991.3107.06.
Location
Currently not on view
date made
1904
maker
Felt & Tarrant Manufacturing Company
place made
United States: Illinois, Chicago
Physical Description
steel (overall material)
plastic (overall material)
wood (overall material)
Measurements
overall: 15.5 cm x 13.2 cm x 36 cm; 6 3/32 in x 5 3/16 in x 14 3/16 in
ID Number
MA.323643
catalog number
323643
accession number
250163
Credit Line
Gift of Victor Comptometer Corporation
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

Comments

Add a comment about this object