Who invented the first mechanical calculator?

Mechanical calculator

Braise Pascal, noted mathematician, thinker, and scientist, built the first mechanical calculator in 1642.Hismachine used gears, wheels and dials. When the wheels were turned in the proper order, a series of numbers were entered and their sum was obtained. The basic principle of his calculator is still used today in water metered and odometers.

The first mechanical calculator, called the Pascaline, had several disadvantages. Although it made calculations faster, it was very costly. If something went wrong, only Pascal himself could repair it!