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Jan 25, 1000
2060 B.C: the Abacus
2060 B.C: in China the abacus appear like a new system to calculate, Used for a more accurate storekeeping for the commerce -
Jan 25, 1500
The first mechanical calculator
Leonardo da Vinci realized a cog-wheeled device to calculate. -
The Side Rule
Invented by William Oughtred, become a mathematical tool before the invention of calculation -
The Pascalina
Blaise Pascal, when he was only 18 years old invented a numerical wheel calculator, that can make addition and subtraction, this calculator survived well into 1900, with the Gottfried Leibniz improvment, that can make also multiplication, division and square root -
Batch system
Joseph Marie develop a loom, that use the batch system to gain information. the batch system use holed cards, with there are contained the program informations -
The Difference Engine
Babbage, for avoid the manual check for the Astronomical Society thats can errors, Babbage realized the blueprint for the Difference Engine, a machine that can make decision and store 1000 variables of 50 digits each.
Unfortunally, Babbage can't make this machine alone, and he died in 1871, without finish it.
The Difference machine was realized infally between 1989 and 1991 -
The Anagraphic machine
between 1880 and 1890, the population grew from 50 millions to 63 millions, and the anagraphic calculation finished when the second must started. Hollerich developed a machine for the anagraphy calculation, that complete all the calculation in only 6 weeks.
After this, Hollerich founded the International Buisness Machine Company (IBM).