Smallwood Calculator

This small stylus-operated non-printing adding machine has seven brass wheels and a steel frame painted black. Seven windows above the wheels reveal the result. The back is covered with green felt. The machine is marked on the front: -THE- (/) SMALLWOOD (/) CALCULATOR (/) OAKLAND (/) CAL. The front of the case is marked: -THE- (/) SMALLWOOD CALCULATOR (/) OAKLAND, CALIFORNIA (/) Patented Feb. 23rd 1926. The machine fits in a wooden stand, which also has a slot for the stylus. The stand has four rubber feet. The entire instrument fits in a black cardboard cover. The stylus is silver-colored metal, with a blue plastic end piece.
Compare to The Calculator (1986.0542.01).
Russell W. Hook, “Adding Machine,” U.S. Patent 1,574,249, February 23, 1926.
Currently not on view
Object Name
adding machine
date made
Physical Description
cardboard (overall material)
steel (overall material)
brass (overal material)
wood (overall material)
felt (overall material)
overall: 7 cm x 33.4 cm x 9.4 cm; 2 3/4 in x 13 5/32 in x 3 11/16 in
place made
United States: California, Oakland
ID Number
accession number
catalog number
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Adding Machines
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Naomi Piekarski
Additional Media

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