Wooden Box Model Comptometer
date: label: date made
content: ca 1906
name: label: maker
content: Felt & Tarrant Manufacturing Company
notes: label: Description
content: This key-driven non-printing adding machine has a wooden case and eight columns of color-coded plastic keys. The keys are black and white, with complementary digits indicated in red. It is a relatively late example of a Comptometer with a wooden, rather than a metal, case.
label: Description
content: There is a spring around each key stem, and the stems become progressively longer as the digits are larger. Eight subtraction levers are in front of the keys. Eight decimal markers are attached to a metal plate, painted black, which is in front of these. A row of nine windows in the plate reveals the number wheels. Hence the machine can have eight-digit numbers entered and compute nine-digit totals. The zeroing mechanism is a knob and lever on the right side.
label: Description
content: The serial number, stamped on the front of the machine under the decimal markers, is 5765. A metal tag attached to the back of the machine is marked: TRADE COMPTOMETER MARK (/) PAT’D (/) JUL.19.87 JUN. 11. 89. (/) OCT.11.87 NOV.25.90 (/) JAN.8.89 DEC.15.91. (/) SEP.22.96 (/) Felt & Tarrant Mfg. Co. (/) CHICAGO.
label: Description
content: Compare to MA.323650.
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
label: See more items in
content: Science & Mathematics
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1987.0107.04
label: catalog number
content: 1987.0107.04
label: maker number
content: 5765
label: accession number
content: 1987.0107
objectType: label: Object Name
content: adding machine
physicalDescription: label: Physical Description
content: plastic (overall material)
label: Physical Description
content: wood (overall material)
label: Physical Description
content: metal (overall material)
label: Measurements
content: overall: 13.4 cm x 20.4 cm x 36.3 cm; 5 9/32 in x 8 1/32 in x 14 9/32 in