Thomas De Colmar's Arithmometer, with mahogany case lid

Thomas De Colmar's Arithmometer, with mahogany case lid

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Thomas de Colmar arithmometer, no. 696, in box

Thomas De Colmar Arithmometer 1867, in box. Charles X Thomas de Colmar invented his Arithmometer in 1820, but it was not made commercially until the 1860s. It was the first commercially successful calculating machine and could be used for addition, subtraction, division and mulitiplication. The mechanism was based on the stepped reckoner invented by Liebniz (1646-1716). Machines of this type were made well into the 20th century, and usually referred to as being of the 'Thomas de Colmar' type.

Details

Category:
Mathematics
Object Number:
1868-1
type:
calculating machines (stepped drum)
credit:
Scott, Col. R.E.

Parts

Colmar arithmometer

Thomas de Colmar arithmometer, no. 696, in box with lid, 18" x 3 1/2"

Measurements:
overall: 180 mm x 470 mm x 85 mm, 5.725 kg
Materials:
steel
Object Number:
1868-1 Pt1
type:
arithmometer
Image ©
The Board of Trustees of the Science Museum
Mahogany case lid, for Thomas de Colmar's arithmometer

Mahogany case lid, for Thomas de Colmar's arithmometer

Lid for Thomas de Colmar arithmometer in wooden case

Measurements:
Overall: 60 mm x 465 mm x 80 mm, 0.8 kg
Materials:
mahogany (wood) and brass (copper, zinc alloy)
Object Number:
1868-1 Pt2
type:
cover - closure
Image ©
The Board of Trustees of the Science Museum