W Calculator, an Adder

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After World War II, inexpensive adders were produced in both Europe and Asia. This example has 8 notched bands on the front, with space at the top of each band for carrying and at the bottom for borrowing. Totals of up to 9 digits appear in round openings above the bands.The front is ferrous metal painted gold, black, and white. The back is black plastic. A metal stylus for entering numbers is on the right and a zeroing bar extends across the top.
A mark at the top of the adder reads: W CALCULATOR. A mark below the bands reads: ADD (/) SUBTRACT (/) MULTIPLY. A mark at the bottom of the back reads: MADE IN WEST GERMANY.
The object was collected by the donor.
Compare to adders MA.336448 and 1980.0787.01, which sold as Wizard calculating machines.
Currently not on view
date made
ca 1955
place made
Physical Description
metal (stylus material)
metal (bands material)
metal (zeroing bar material)
metal (front material)
plastic (back material)
overall: .8 cm x 9.4 cm x 15.2 cm; 5/16 in x 3 11/16 in x 5 31/32 in
ID Number
accession number
catalog number
Credit Line
Gift of Michael B. Schiffer
See more items in
Medicine and Science: Mathematics
Measuring & Mapping
Data Source
National Museum of American History