Comptometer Model F

Description:

This full-keyboard non-printing adding machine has a copper-colored steel case. The keys are in ten columns, colored according to the place value of the digit entered. Complementary digits are indicated on them. The keys are alternately concave (odd digits) and flat (even digits). At the front are subtraction levers and numbered decimal markers. In front of these are eleven windows, covered with clear plastic, which reveal the result on the number wheels. A zeroing lever is on the right side. This is the last of the Comptometers to be designed by Dorr E. Felt. After this, the firm of Felt & Tarrant relied on the work of other inventors.

The machine has serial number 130780, which is indicated to the left of the keyboard. A metal plate screwed to the top of the machine in back of the keyboard is marked: TRADE COMPTOMETER MARK (/) PAT’D [. . .] (/) Felt & Tarrant Mfg. Co. (/) CHICAGO. The last patent date listed on the plate is: SEP.15.14

A Model F Comptometer with serial number 100,346 was produced in May, 1915, hence this machine is somewhat later. The model H succeeded the model F in 1920.

This machine was a gift of John T. Cheney of Washington, D.C.

Reference:

Felt & Tarrant, Accession Journal 1991.3107.06

Date Made: 1917

Maker: Felt & Tarrant Manufacturing Company

Location: Currently not on view

Place Made: United States: Illinois, Chicago

Subject: Mathematics

Subject:

See more items in: Medicine and Science: Mathematics, Adding Machines, Science & Mathematics

Exhibition:

Exhibition Location:

Credit Line: Gift of John T. Cheney

Data Source: National Museum of American History

Id Number: MA.333576Maker Number: 130780Catalog Number: 333576Accession Number: 299951

Object Name: adding machine

Physical Description: wood (overall material)steel (overall material)plastic (overall material)Measurements: overall: 14.3 cm x 27.5 cm x 36 cm; 5 5/8 in x 10 13/16 in x 14 3/16 in

Guid: http://n2t.net/ark:/65665/ng49ca746a5-0a39-704b-e053-15f76fa0b4fa

Record Id: nmah_690479

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.