Comptometer Study Model 520 Series (?) Adding Machine Section
date: label: date made
content: ca 1927
name: label: maker
content: Felt & Tarrant Manufacturing Company
notes: label: Description
content: This is a model of a section of a Comptometer. It has a single column of white plastic numeral keys. Alternate keys are concave (odd digits) and flat (even digits). Left of the number keys are two red keys. One is marked: UNIVERSAL (/) KEY (/) DRIVE. The other is marked: INDIVIDUAL (/) KEY (/) DRIVE. The section of a metal case under the keys is painted brown. The mechanism is steel. The model has no numeral wheels, no zeroing lever, no base, and no cover.
label: Description
content: During the late 1920s, J. A. V. Turck of Felt & Tarrant Manufacturing Company worked on inventing an adding machine that could either be driven by striking individual keys (have an individual key drive, in his language), or by setting keys and then driving them simultaneously (having a universal key drive, in his language). This object relates to that effort. Comptometers had traditionally used individual key drive.
label: Description
content: References:
label: Description
content: U.S. Patent 1869872, granted August 2, 1932.
label: Description
content: Felt & Tarrant, Accession Journal, #134, 135, 136, 150.
label: Location
content: Currently not on view
place: label: place made
content: United States: Illinois, Chicago
topic: label: Subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Adding Machines
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content: Science & Mathematics
creditLine: label: Credit Line
content: Gift of Victor Comptometer Corporation
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.323640
label: catalog number
content: 323640
label: accession number
content: 250163
objectType: label: Object Name
content: adding machine section
physicalDescription: label: Physical Description
content: steel (overall material)
label: Physical Description
content: plastic (overall material)
label: Measurements
content: overall: 14.5 cm x 7.2 cm x 31 cm; 5 23/32 in x 2 27/32 in x 12 7/32 in