Mechanism from National Cash Register, Model 79

Mechanism from National Cash Register, Model 79

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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.
Currently not on view
Object Name
cash register mechanism
date made
National Cash Register Company
place made
United States: Ohio, Dayton
Physical Description
metal (overall material)
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
accession number
catalog number
Credit Line
Gift of National Cash Register Company
See more items in
Medicine and Science: Mathematics
Cash and Credit Registers
Computers & Business Machines
Data Source
National Museum of American History
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