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.

Date Made: 1926

Location: Currently not on view

Place Made: United States: California, Oakland

Subject: Mathematics


See more items in: Medicine and Science: Mathematics, Adding Machines, Science & Mathematics


Exhibition Location:

Credit Line: Gift of Naomi Piekarski

Data Source: National Museum of American History

Id Number: MA.336184Accession Number: 1977.0688Catalog Number: 336184

Object Name: adding machine

Physical Description: cardboard (overall material)steel (overall material)brass (overal material)wood (overall material)felt (overall material)Measurements: 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


Record Id: nmah_690284

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.