PASCALINE:

Fig: PASCALINE 

    A French mathematician Blaise Pascal developed PASCALINE in 1642AD. PASCALINE was the first mechanical calculator based on decimal number system. It is use to perform addition (+) and subtraction (-) of numbers up to eight digits. It consisted of a series of toothed metal wheels and each wheel contained the dial having numbers from 0 to 9. A complete rotation of the first wheel rotates the second wheel to the next number and so on.

This principle is still used in odometers in vehicles, pumps of petrol stations, electricity meters and old rotary telephone etc.

    # Who was developed PASCALINE?

-                 - A French mathematician Blasé Pascal developed PASCALINE.

    # When was developed PASCALINE?

-                 -  In 1642 AD

    # Which was the first mechanical calculator?

-               -  PASCALINE

            

Fig: Blaise Pascal

 

Fig: Rotary Telephone