Arithma by Addiator

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This black and gold-colored metal, comb-sized notched band adder has six columns above for addition and six below for subtraction. Ten notches of any one band appear only in addition, ten in both addition and subtraction, and ten in subtraction alone. The columns on top are crook-shaped to allow for carrying and those at the bottom in the shape of an inverted crook to allow for borrowing. Six holes in the middle show the result. Across the top is a zeroing bar. Leather case.
The firm of Carl Keubler produced adders under the name Addiator in Berlin (later West Berlin) from 1920 until the 1980s. This is one of three versions of the Addiator in the Smithsonian collections. According to the donor, an employee of Volkswagen of America in Chicago brought it to the United States.
Instructions stored with documentation.
References: Popular Science, vol. 172, March, 1958, p. 66.
Popular Science, vol. 178, January, 1961, p. 41.
Thorp & Martin Corp., Office Supplies and Equipment Purchasing Guide, Boston, 1968, p. 372.
P. Kidwell, Rittenhouse, 1994, 8:78-96.
Martin Reese, Historische Buerowelt, 43 (September 1995).
Currently not on view
date made
ca 1960
Harrison Home Products Corporation
Harrison Home Products Corporation
Addiator G.m.b.H.
place made
Deutschland: Berlin, West-Berlin
place distributed
United States: New Jersey, Harrison
Physical Description
leather (overall material)
metal (overall material)
overall: .8 cm x 6.2 cm x 17.2 cm; 5/16 in x 2 7/16 in x 6 25/32 in
ID Number
accession number
catalog number
Credit Line
Gift of Irving N. Segal
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Data Source
National Museum of American History


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