Comptometer Model F

Description
This full-keyboard non-printing adding machine represents the successful adoption of mechanical aids to computation by American scientists. It was one of several computing devices owned by the meteorologist Daniel Draper. Draper used Comptometers in his work at the New York Meteorological Observatory from about 1886. He acquired this machine in 1914 or later.
The machine has a metal case painted brown and a metal mechanism, with eight columns of octagonal, color-coded plastic keys. Complementary digits are indicated on the keys. Keys for odd digits are concave, and those for even digits are flat. The length of the key stems increases going from front to back. There are subtraction levers, numbered decimal markers in front of the keys, and nine windows to show the result in front of the decimal markers. A zeroing handle is on the right side. The machine fits on a wooden stand and has a metal cover painted black.
The machine has serial number F58074. It is marked on a metal plaque screwed to the back of the machine: TRADE COMPTOMETER MARK (/) PAT'D [. . .] (/) Felt & Tarrant Mfg. Co. (/) CHICAGO. It is also marked there with several patent dates, the last of which is; SEP.15.14. It is marked on the front of the metal cover: COMPTOMETER (Pronounced like Thermometer) (/) FELT & TARRANT MFG. CO. (/) CHICAGO. U.S.A. (/) Adds - Divides (/) Multiplies - Subtracts
Reference:
P. A. Kidwell, “American Scientists and Calculating Machines: From Novelty to Commonplace,” Annals of the History of Computing, 12, 1990, pp. 31-40.
Location
Currently not on view
Object Name
adding machine
date made
1915
maker
Felt & Tarrant Manufacturing Company
Physical Description
wood (overall material)
metal (overall material)
plastic (overall material)
Measurements
overall: 15.7 cm x 24 cm x 36.5 cm; 6 3/16 in x 9 7/16 in x 14 3/8 in
place made
United States: Illinois, Chicago
ID Number
MA*335357
maker number
F58074
catalog number
335357
accession number
304826
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
Gift of John William Christopher Draper and James Christopher Draper
Additional Media

Visitor Comments

Add a comment about this object

**Please read before submitting the form**

Have a comment or question about this object to share with the community? Please use the form below. Selected comments will appear on this page and may receive a museum response (but we can't promise). Please note that we generally cannot answer questions about the history, rarity, or value of your personal artifacts.

Have a question about anything else, or would you prefer a personal response? Please visit our FAQ or contact page.

Personal information will not be shared or result in unsolicited e-mail. See our privacy policy.

Image CAPTCHA
Enter the characters shown in the image.