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John Napier Bone
Another manual calculating device was Jone Napier Bone. It was a cardboard multiplication calculator. It was designed in the early 17th century
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Blaise Pascal
The first mechanical adding machine was invented by Blaise Pascal in 1642.It could
Only add and subtract number. Division and multiplication was done by repeated addition and subtractions.
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Gottfried Wilhelm Von Leibnitz
In 1694 a German scientist Leibnitz a developed a calculating machine. It was the first calculator that could multiply and divide also.
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Charles Xavier
A French scientist Charles Xavier developed a machine that could perform addition, subtraction, multiolication, and division.
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Punched Bard
A French engineer Joseph developed punchboard system for power looms. It was used to create specific weaving pattern on cloths. Later on the system was used in computing device.
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Charles Babbage
In 1822 a mathematician Charles Babbage invented a Difference Engine for mathematical calculation. In 1842 he developed Analytical Engine that was automatic. This engine could perform 60 additions per minute.
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Herman Hollerith
In18889 Herman Hollerith applied the idea of punchboard in a computer. He used punch card in computer for input and output.
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Atanasoff
Atanasof was a professor at Lowa University. He invented an electronic computer. He applied Boolean algebra to computer circuitry…