This stylus-operated steel notched band adder has seven crook-shaped columns and one straight one, with eight notched bands below. Eight windows show results, and a narrow clearing lever is at the top. A steel plate slides over seven columns in the shape of inverted crooks, as well as an eighth straight column. These are used in subtraction. Instructions accompany the instrument. Compare to MA*313629.
The TASCO pocket arithmometer closely resembles an adder sold by the Gray Arithmometer Company of Ithaca, New York, in the early 20th century and 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.
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 152 (January 1948), p. 34.
Utility Supply Company, Office Supply Catalog (Chicago, 1946), p. 285.
Currently not on view
Object Name
date made
ca 1945
Tavella Sales Company
Tavella Sales Company
Physical Description
steel (overall material)
overall: .5 cm x 7.7 cm x 13.8 cm; 3/16 in x 3 1/32 in x 5 7/16 in
place made
United States: New York, New York
place distributed
United States: New York, New York
ID Number
accession number
catalog 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 Daniel J. Boorstin
Additional Media

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