It said that computer was invented in china 3000 years ago. Earlier the computer name was abacus.
Abacus: Abacus is a frame od wires.small balls are inserted in these wires.This machie was used to add, substract, multiply, and divide digits. This fram is divided into two parts. in which each wire on one side has two balls, the value of which is 5 and in other part each wire has 5-5 balls, the value of which is 1.
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| The Abacus |
After, the Abacus, John Napier was invented Napier's Bone.
Napier's Bone: John Napier is a scottish mathematician. He made some rectangular strip from elephant teeth called Napier's Bone. with the help of it in those time multiplication could be done quickly.Later, Napier's Developed logarithim method.
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| Napier's Bone |
Slide Rule: Slide rule was invented by german mathematician William Oughtred. it has two marked strips, which can be moved back and forth in equal measure.
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| Slide Rule |
Pascal's calculator: This is a mechnical calculator invented by Blaise Pascal in france.
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| Pascal's calculator |
Leibnitz's Mechanical Calculator: it's developed by Germany's professors Leibntiz in 1677. Leibniz change some part of pascal's calculator and improve it called LMC.
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| Leibnitz's Mechanical Calculator |
Diffrence Engine of Babbage: It is made by Cambridge university mathematic professor charles babbage in 1823. Babbage is also known as father of modern computer. Diffrence engene could caculate the value of various algebriac function to 20 decimal. also it used to many types of mathematical tables in minutes. in those days in insurance, post office, rails, production etc.
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| Diffrence Engine of Babbage |
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