Comptometer Study Model 520 Series (?) Adding Machine Section

Description
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.
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.
References:
U.S. Patent 1869872, granted August 2, 1932.
Felt & Tarrant, Accession Journal, #134, 135, 136, 150.
Location
Currently not on view
Object Name
adding machine section
date made
ca 1927
maker
Felt & Tarrant Manufacturing Company
Physical Description
steel (overall material)
plastic (overall material)
Measurements
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
place made
United States: Illinois, Chicago
ID Number
MA*323640
catalog number
323640
accession number
250163
subject
Mathematics
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Adding Machines
Data Source
National Museum of American History, Kenneth E. Behring Center

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