![](https://coimages.sciencemuseumgroup.org.uk/74/294/large_thumbnail_1990_0459__0002_.jpg)
Felt and Tarrant Comptometer, 1887.
- Made:
- circa 1900 in Chicago
- manufacturer:
- Felt and Tarrant Manufacturing Company
- inventor:
- Dorr Eugene Felt
![Felt and Tarrant Comptometer, 1887.](https://coimages.sciencemuseumgroup.org.uk/127/97/small_thumbnail_1911_0255__0002_.jpg)
![Felt and Tarrant Comptometer, 1887.](https://coimages.sciencemuseumgroup.org.uk/127/96/small_thumbnail_1911_0255__0001_.jpg)
![Felt and Tarrant Comptometer, 1887.](https://coimages.sciencemuseumgroup.org.uk/127/98/small_thumbnail_1911_0255__0003_.jpg)
![Felt and Tarrant Comptometer, 1887.](https://coimages.sciencemuseumgroup.org.uk/127/100/small_thumbnail_1911_0255__0005_.jpg)
![Felt and Tarrant Comptometer, 1887.](https://coimages.sciencemuseumgroup.org.uk/127/99/small_thumbnail_1911_0255__0004_.jpg)
Comptometer, early form (wooden box), 72 keys numbered, plate on top of box engraved " Trade Comptometer mark, Patd. July 19th 1887, Oct 11th 1887, Jan 8th 1889, June 11th 1889, Nov 25th 1890, Dec 15th 1891, Felt & Tarrant Manufacturing Co., Chicago"
An early example of the Comptometer, with 72 numbered keys. The top of box has a plate engraved with varoius patents up to 1891. The Felt and Tarrant Comptometer was one of the first generation of mass-produced office calculators. It was extremely successful being able to multiply and subtract quickly and efficiently.
Details
- Category:
- Mathematics
- Object Number:
- 1911-255
- Materials:
- mahogany (wood), steel (metal), brass (copper, zinc alloy) and resin (unidentified)
- Measurements:
-
Overall: 130 mm x 210 mm x 365 mm, 4.5 kg
- credit:
- Felt & Tarrant Manufacturing Company