Comptometer (0033)
Index: 0033
Year: Around 1920's - 1930's (made from 1887 to the mid-1970s)
Maker: Felt & Tarrant Mfg. Co., Chicago, USA
Dimensions: 38 x 28 x 15 cm
Info
Mechanical calculator patented by E. Felt in 1887. Mostly used fior additions, but could also be used for subtractions, multiplication or division (although not clear to me how the latter could be done).
Earlier models would have a wooden enclosure. This object has a red copper enclosure (or assume red copper plated).
On this type, there are 12 columns of 9 keys.
Inscriptions:
COMPTOMETER
Manufactured in the
UNITED STATES N. AMERICA
Felt & Tarrant Mfg. Co.
CHICAGO
References/Links/More Info
Science Museum Group - Felt & Tarrant Mfg Co
The History of Computing - Complete History of the Comptometer of Dorr Felt
