Mechanism from National Cash Register, Model 79

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
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
place made
United States: Ohio, Dayton
ID Number
accession number
catalog number
Cash and Credit Registers
Computers & Business Machines
See more items in
Medicine and Science: Mathematics
Cash and Credit Registers
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of National Cash Register Company
Additional Media

Visitor Comments

Add a comment about this object

**Please read before submitting the form**

Have a comment or question about this object to share with the community? Please use the form below. Selected comments will appear on this page and may receive a museum response (but we can't promise). Please note that we generally cannot answer questions about the history, rarity, or value of your personal artifacts.

Have a question about anything else, or would you prefer a personal response? Please visit our FAQ or contact page.

Personal information will not be shared or result in unsolicited e-mail. See our privacy policy.

Enter the characters shown in the image.