Comptograph

Description
After Dorr E Felt invented and began to sell successfully a key-driven adding machine known as the Comptometer, he designed a printing adding machine dubbed the Comptograph. This example has a cherrywood case and eight columns of metal key stems, with turquoise and white color-coded discs set in the metal key tops. Digits and complements of digits are shown on the discs. Each column has nine keys. The cover under the keys consists of metal slats with holes drilled in them, with one slat for each column of keys. A glass window at the front shows nine metal wheels that record totals.
On the right side toward the front are a knob and a lever. Depressing the lever allows one to turn the knob and zero the total. Immediately to the right of the keyboard is a small lever, which is pushed up to release the keys. Further to the right are two large buttons attached to levers. When the button at the right back is depressed, the carriage moves to a new column. The other button on the right may advance the paper. To the left at the front is another large button on a straight shaft (depressing this button probably is intended to print totals or subtotals). At the back of the machine is a wide carriage, the printing mechanism for the adding machine, and a ribbon. This mechanism prints eight-digit entries and totals. A bell on top of each of the spools for the ribbon rings to warn that the ribbon is almost unwound.
The machine is stamped on the front below the glass window: 1902. It is marked on a metal plate screwed to the right side: MODEL A No 1902 (/) PATENTED. It is also marked there: MAR. 11. 1902. It is also marked there: OTHER PATENTS PENDING. (/) COMPTOGRAPH CO. (/) CHICAGO, U.S.A.
The coloring of the keys resembles that on the Comptometer with catalog number MA*248688, which dates from 1898, and the Comptograph with typewriter MA*323636. The Accession Journal dates this machine to 1900, but the tag screwed to the machine indicates a slightly later date.
References:
Felt & Tarrant, Accession Journal, 1991.3107.06.
Pamphlet 1994.3060.05.
Location
Currently not on view
Object Name
adding machine
date made
1900
maker
Comptograph Company
Physical Description
metal (overall material)
wood (overall material)
ceramic (overall material)
cloth (overall material)
rubber (overall material)
glass (overall material)
Measurements
overall: 31 cm x 48 cm x 51.6 cm; 12 7/32 in x 18 29/32 in x 20 5/16 in
place made
United States: Illinois, Chicago
ID Number
MA*323632
catalog number
323632
maker number
1902
accession number
250163
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 Victor Comptometer Corporation

Visitor Comments

Add a comment about this object

Submit a comment or ask a question about this object using the form below. Submissions are moderated and may receive a curator response. Please note that we cannot evaluate or appraise your personal artifacts. For other questions or general inquiries 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.