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(2600 BC) The abacus is a consequence to the expansion of commerce, when people started to need a an accurate recordkeeping.
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Leonardo Da Vinci, in 1500 invented a cog-wheeled device that has been interpreted as the first mechanical calculator.
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Was invented by William Oughtred and it remained the mathematician's tool of choice until the electronic calculator took over.
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Blaise Pascal invented pascaline, a mechanical adding machine, in 1642. It used a system of gears turned by hand to do addition and substraction
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Gottfried Leibniz improved Pascaline adding multiplication, division and square root capabilities.
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Charles Baggage finds a way to perform calcuations for the Astronomical Society. He designs a prototype of the Difference Engine
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In 1890 Dr Herman Hollerith in occasion of the census, developed a machine that compiled the census mechanically
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Babbage in 1830 worked on the project of a new device called Analytical Engine, that was able to do sequential control, branching and looping
