-
Nov 18, 1387
The 1st calculating machine- ABACUS
It was 1st developed in the 13th century by the Chinese. It is still used today in a "modern version". -
Napier's Bones
John Napier was the inventor of logarithms, also invented this aid to calculation known as Napier's Bones.The bones consist of a set of rectangular rods, each marked with a counting number at the top, and the multiples of that number down their lengths. When aligned against the row of multiples as shown, any multiple of the top number can be read off from right to left by adding the digits in each parallelogram in the appropriate row. Multiplication is thus reduced to addition. -
The Slide Rule
This was a united effort by two Englishmen Edmund Gunter and the reverend William Oughtred. This slide rule consisted of two algebraic scales that could be manipulated together for calculation. -
Leibniz Stepped Drum
The famous German polymath, mathematician and philosopher, Gottfried Wilhelm Von Leibniz invented a machine able to perform the four basic arithmetical operations. It uses a special type of gear named Leibniz Wheel which is a cylinder with nine bar-shaped teeth of incrementing length parallel to the cylinder’s axis. -
Millionaire Calculator
Millionaire calculator introduced. It allowed direct multiplication by any digit. one turn of the crank for each figure in the multiplier.
