Comptometer Model C, British Currency Indexer

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This full-keyboard non-printing adding machine has a steel frame painted black, a steel mechanism, and eight columns of black and white plastic keys, with complementary digits indicated. The rightmost column has three black keys and indications of quarters from 1/4 to 3/4. The second column has eleven white keys. The third column has nine black keys. The fourth column from the right has one black key. The four left columns have nine keys each. The keys are alternately concave (odd digits) and flat (even digits). The machine is designed for calculations involving pounds, shillings, and pence.
Thesubtraction levers are at the front of the columns of keys, decimal indicators in front of these, and nine windows covered with clear plastic that show the result. The wheel in the first position is divided to read eighths. A zeroing lever is on the right side. At the back of the machine is a metal attachment painted black that holds five paper-covered dials. Four of these dials are covered with metal shutters. The shutters are opened manually by pressing down on the key directly below the shutter. The shutter is then locked in position. A release lever on the left side closes the shutter. A knob on the left side manually rotates the dials. The entire instrument is designed to make it easier to multiply units of British currency. The machine has serial number 33077.
A label received with the object indicates that the British Currency Indexer was made approximately in 1914.
Felt & Tarrant, Accession Journal, 1991.3107.06.
Currently not on view
date made
Felt & Tarrant Manufacturing Company
place made
United States: Illinois, Chicago
Physical Description
paper (overall material)
metal (overall material)
plastic (overall material)
overall: 21 cm x 25 cm x 37 cm; 8 9/32 in x 9 27/32 in x 14 9/16 in
ID Number
maker number
catalog number
accession number
Credit Line
Gift of Victor Comptometer Corporation
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Adding Machines
Data Source
National Museum of American History


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