This stylus-operated notched band adder has eight columns. A sliding plate atop the machine allows one to adjust the columns for subtraction. A blue-black plastic case holds a metal stylus. Accompanying the instrument are “Instructions for Operating the Pocket Arithmometer.”
The TASCO pocket arithmometer closely resembles an adder sold by the Gray Arithmometer Company of Ithaca, New York, in the early 20th century. It was distributed by the Morse Chain Company of Ithaca in the 1920s. In 1929, the Morse Chain Company became part of Borg-Warner Corporation. Distribution of the adder soon shifted to the Tavella Sales Company of New York City.
Compare to 1986.0663.01.
References: P. Kidwell, “Adders Made and Used in the United States,” Rittenhouse, 8, (1994), pp. 78-96.
Advertisements in Popular Mechanics 83 (March 1945), p. 178, (April 1945): 180, and (May, 1945), p. 178.
Popular Science 153 (January 1948), p. 34.
Utility Supply Company, Office Supply Catalog (Chicago, 1946), p. 285.
New York Times, October 30, 1949, p. S12.
Currently not on view
Object Name
date made
Tavella Sales Company
Borg-Warner Corporation
Physical Description
plastic (overall material)
steel (overall material)
overall: .5 cm x 7.6 cm x 13.7 cm; 3/16 in x 3 in x 5 13/32 in
place made
United States: New York, Ithaca
place distributed
United States: New York, New York
ID Number
catalog number
accession number
Science & Mathematics
See more items in
Medicine and Science: Mathematics
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Mr. S.H. Oliver

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