Comptometer Educator

Careful study often indicated improved ways of using adding machines. For example, Comptometer operators were trained to use only the first five (lower) keys of a Comptometer. It was quicker to push a “4” key and a “5” key than to reach up and push a “9” key. This device assisted in training. It has a green plastic base with a 5x5 keyboard. The key stems and keyboard are metal, while the keys and base are plastic. The keys are alternately concave (odd digits) and flat (even digits). There is no mechanism. The device is marked: COMPTOMETER (/) EDUCATOR (/) A FELT AND TARRANT PRODUCT.
Aprivately owned undated brochure for the Comptometer Educator uses some of the same photographs as a 1954 training manual for Comptometer operators, hence the date assigned. For the 1954 training manual, see 1994.3060.008.
Currently not on view
Object Name
adding machine training device
date made
ca 1955
Felt & Tarrant Manufacturing Company
Physical Description
metal (overall material)
plastic (overall material)
overall: 10.5 cm x 14 cm x 17.3 cm; 4 1/8 in x 5 1/2 in x 6 13/16 in
place made
United States: Illinois, Chicago
ID Number
catalog number
accession 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 Myron R. Smith

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