Centigraph Adder
date: label: date made
content: ca 1900
notes: label: Description
content: This nine-key manual non-printing adding machine has an iron case painted black, and nine white number keys arranged in two rows. It adds one digit at a time, up to and including 500. The digits of the result appear in three windows on the face of the machine, which is in the shape of an alarm clock. A zeroing knob is in the center of this face, and the result windows are above the knob. There is no maker’s mark on the machine.
label: Description
content: The machine is identified as a Centigraph Adder in the accession file, although it differs from other machines with this name in having nine rather than five keys, in having a case, in the placement of the result windows, and in having paper and plastic rather than plastic key covers. Moreover it has a mechanical carry, unlike the Centigraph described in the patent. Two screws on back allow one to remove front cover. The mechanism appears to be steel, and quite different from A.E.Shattuck’s 1891 patent for the Centigraph.
label: Description
content: References:
label: Description
content: Arthur E. Shattuck, “Adding-Machine,” U.S. Patent 453,778, June 9, 1891.
label: Description
content: Accession File.
label: Location
content: Currently not on view
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
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.323611
label: accession number
content: 250163
label: catalog number
content: 323611
objectType: label: Object Name
content: adding machine
physicalDescription: label: Physical Description
content: iron (overall material)
label: Physical Description
content: plastic (overall material)
label: Physical Description
content: paper (overall material)
label: Physical Description
content: metal (overall material)
label: Measurements
content: overall: 11.8 cm x 10.5 cm x 15.5 cm; 4 21/32 in x 4 1/8 in x 6 3/32 in