Comptometer Model E

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Description
This full-keyboard non-printing adding machine has a brown metal case, eight rows of plastic keys for entering numbers that are colored according to the place value of the digits entered, eight subtraction levers with decimal markers, and a row of nine windows at the front of the machine to show the result. Complementary numbers are indicated on the keys. Keys for odd digits are concave, and those for even ones are flat. There is a button on the upper right of the keyboard and a zeroing lever on the right side. The machine featured an error-locking mechanism. Metal “wings” extending on the right and left side of each key are introduced as part of an “individual key lock” mechanism.
The machine has serial number 61612. The last patent date on the metal tag behind the keyboard is: JUN.7.10.
Reference:
Felt & Tarrant, Accession Journal, 1991.3107.06.
Location
Currently not on view
date made
1913
maker
Felt & Tarrant Manufacturing Company
place made
United States: Illinois, Chicago
Physical Description
metal (overall material)
plastic (overall material)
wood (overall material)
Measurements
overall: 14 cm x 24 cm x 36.2 cm; 5 1/2 in x 9 7/16 in x 14 1/4 in
ID Number
MA.323647
maker number
61,612
catalog number
323647
accession number
250163
Credit Line
Gift of Victor Comptometer Corporation
subject
Mathematics
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Adding Machines
Data Source
National Museum of American History, Kenneth E. Behring Center

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