Adding Machine Model
date: label: date made
content: ca 1900
notes: label: Description
content: This model of a nine-key non-printing adding machine has a wooden base, plastic sides, and a metal mechanism and keys. A bar across the back is moved in differing amounts according to the key pressed (the nine keys across the front are depressed in slots of varying length and hence rotate the bar varying amounts). The bar, in turn, rotates a numeral wheel with the numbers 0 to 99 on it. There is a one-digit carry. Keys are marked with the digits from 1 to 9 (the 5 key is missing). There is no 0 key.
label: Description
content: The arrangement of the result wheels is somewhat similar to that on the ten-key machine invented by Peter Lindholm and patented in 1886. However, the number of keys and arrangement of the keyboard is different. The plastic sides also mitigate against a 19th century origin. No patent model was made for this patent, although there were production models.
label: Description
content: Reference:
label: Description
content: Peter Lindholm, “Adding Machine,” U.S. Patent 343770, June 14, 1886.
label: Location
content: Currently not on view
topic: label: Subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
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content: Adding Machines
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content: Science & Mathematics
creditLine: label: Credit Line
content: Gift of L. Leland Locke
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1983.3003.057
label: nonaccession number
content: 1983.3003
label: catalog number
content: 1983.3003.057
objectType: label: Object Name
content: adding machine
physicalDescription: label: Physical Description
content: wood (overall material)
label: Physical Description
content: metal (overall material)
label: Measurements
content: overall: 11.1 cm x 23.8 cm x 13.5 cm; 4 3/8 in x 9 3/8 in x 5 5/16 in