Comptometer - Wooden Box Model
- Description
- This key-driven non-printing adding machine has a metal mechanism, steel keys with German silver and plastic key tops, and steel dials at the front that record the result. It is a production model of the Comptometer made by Felt & Tarrant Company of Chicago during its early years.
- The eight columns of keys have nine keys each. Celluloid discs in the key tops are color-coded to mark off dollars and cents. Complementary digits are indicated on the discs, to aid in subtraction. The key tops are alternately concave (odd digits) and flat (even digits). There is a spring around each key stem. Eight levers above the dials serve as decimal markers. Nine windows at the front of the machine reveal the result.
- A metal piece to the left of each “1” key is moved to prevent carrying when the complementary digits are used for subtraction. Depressing a lever on the right side of the machine allows one to turn a nearby knob and zero the number dials.
- The serial number, indicated in the front center of the machine under the decimal markers, is 1876. A second mark, on a metal tag screwed to the machine in back of the keyboard, reads: TRADE COMPTOMETER MARK (/) PAT’D (/) JUL.19.87 JUN. 11. 89. (/) OCT.11.87 NOV.25.90 (/) JAN.8.89 DEC.15.91. (/) Felt & Tarrant Mfg. Co. (/) CHICAGO.
- This machine was transferred to the Smithsonian from the U.S. Geological Survey in 1908.
- Reference:
- 1991.3107.06 (Catalog of the Felt & Tarrant collection).
- Location
- Currently not on view
- Object Name
- adding machine
- date made
- 1898
- maker
- Felt & Tarrant Manufacturing Company
- Physical Description
- cherry wood (overall material)
- metal (overall material)
- plastic (overall material)
- Measurements
- overall: 15.7 cm x 21 cm x 38.4 cm; 6 3/16 in x 8 9/32 in x 15 1/8 in
- place made
- United States: Illinois, Chicago
- ID Number
- MA*248688
- maker number
- 1876
- catalog number
- 248688
- accession number
- 48341
- subject
- Mathematics
- 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
- Transfer from US Geological Survaey
- Additional Media
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