An 'exceptionally rare' pocket-sized calculator from the 17th Century is expected to attract £100,000 at auction. The Arithmetical machine is one of the first mechanical calculating devices known ...

1820 Thomas De Colmar The first calculating machine put into serial production was the Arithmomètre (arithmometer) of the French entrepreneur Charles-Xavier Thomas de Colmar (1785-1870).

A calculating machine model developed by Ramon Verea in 1878. The model was one of the first calculating machines that could multiply a number directly instead of using repeated addition. A Xerox 8010 ...

Calculator development was computing’s cutting edge. The first microprocessor, the Intel 4004, was designed for a calculator made by Busicom, a Japanese firm.

Invented by Leonardo Torres in 1920, the Torres calculating machine is a machine that solves essential addition, subtraction, multiplication, and division problems using a simple manner. It was a ...

The device is considered by some to be the first analog computer and was thought to have been constructed in 100–150 B.C.