Mechanism from National Cash Register, Model 79

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Description
By 1894, when this device was made, the National Cash Register Company had developed an adding mechanism in which digits were indicated on the rim of rotating wheels. This is such a mechanism. The three wheels could rotate to show totals as high as $9.99. Four other wheels on the left side each have the digits from 0 to 9 around the edge. The mechanism is mounted on a white wooden display board.
A mechanism of this type was used in the NCR Model 79 cash register (see object MA.316701). NCR went on to develop a more compact mechanism that could represent eight totals, rather than just one, on a single shaft. See object MA.316704.
Location
Currently not on view
date made
1894
maker
National Cash Register Company
place made
United States: Ohio, Dayton
Physical Description
metal (overall material)
Measurements
overall: 7.1 cm x 28.5 cm x 5.2 cm; 2 25/32 in x 11 7/32 in x 2 1/16 in
ID Number
MA.316703
accession number
225455
catalog number
316703
Credit Line
Gift of National Cash Register Company
subject
Mathematics
Business
See more items in
Medicine and Science: Mathematics
Cash and Credit Registers
Computers & Business Machines
Data Source
National Museum of American History, Kenneth E. Behring Center

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