Torpedo Adding Machine

This German key-driven adding machine has a black plastic case and eight columns of steel keys covered with black and white plastic key covers. The columns run from 1 to 5 (not from 1 to 9). Keys for odd digits are deep, and those for even digits relatively shallow. The metal zeroing bar is on the left, and nine windows in the front show the result. Decimal places are marked along the windows. There machine has no provision for subtraction. The bottom has black felt pads. The serial number marked on the bottom of the machine is 005105.
This example comes from the collection of Felt & Tarrant Manufacturing Company.
E. Martin, Die Rechenmaschinen und ihre Entwicklungsgeschichte, [1925 edition with later supplement], p. 457. This source says the machine was introduced in 1931.
Currently not on view
Object Name
adding machine
date made
Torpedo-Werke A.G.
Physical Description
steel (overall material)
felt (overall material)
plastic (overall material)
overall: 10.5 cm x 20 cm x 15 cm; 4 1/8 in x 7 7/8 in x 5 29/32 in
place made
Deutschland: Hessen, Frankfurt
ID Number
accession number
catalog number
Science & Mathematics
Adding Machines
See more items in
Medicine and Science: Mathematics
Adding Machines
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Victor Comptometer Corporation
Additional Media

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