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PASCAL CALCULATOR Pascal's calculator (alsoknown as the arithmetic machine or Pascaline ) is a mechanical calculator invented ...
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Punched card . A punched card or punch card is a piece of stiff paper that can be used to contain digital information represente...
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Abacus A Chinese abacus, Suanpan Calculating-Table by Gregor Reisch : Margarita Philosophica , 1503. The woodcut sho...
Abacus
Abacus A Chinese abacus, Suanpan Calculating-Table by Gregor Reisch : Margarita Philosophica , 1503. The woodcut sho...