Comptometer Model F
date: label: date made
content: 1917
name: label: maker
content: Felt & Tarrant Manufacturing Company
notes: label: Description
content: This full-keyboard non-printing adding machine has a copper-colored steel case. The keys are in ten columns, colored according to the place value of the digit entered. Complementary digits are indicated on them. The keys are alternately concave (odd digits) and flat (even digits). At the front are subtraction levers and numbered decimal markers. In front of these are eleven windows, covered with clear plastic, which reveal the result on the number wheels. A zeroing lever is on the right side. This is the last of the Comptometers to be designed by Dorr E. Felt. After this, the firm of Felt & Tarrant relied on the work of other inventors.
label: Description
content: The machine has serial number 130780, which is indicated to the left of the keyboard. A metal plate screwed to the top of the machine in back of the keyboard is marked: TRADE COMPTOMETER MARK (/) PAT’D [. . .] (/) Felt & Tarrant Mfg. Co. (/) CHICAGO. The last patent date listed on the plate is: SEP.15.14
label: Description
content: A Model F Comptometer with serial number 100,346 was produced in May, 1915, hence this machine is somewhat later. The model H succeeded the model F in 1920.
label: Description
content: This machine was a gift of John T. Cheney of Washington, D.C.
label: Description
content: Reference:
label: Description
content: Felt & Tarrant, Accession Journal 1991.3107.06
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
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content: Adding Machines
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content: Science & Mathematics
creditLine: label: Credit Line
content: Gift of John T. Cheney
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.333576
label: maker number
content: 130780
label: catalog number
content: 333576
label: accession number
content: 299951
objectType: label: Object Name
content: adding machine
physicalDescription: label: Physical Description
content: wood (overall material)
label: Physical Description
content: steel (overall material)
label: Physical Description
content: plastic (overall material)
label: Measurements
content: overall: 14.3 cm x 27.5 cm x 36 cm; 5 5/8 in x 10 13/16 in x 14 3/16 in