Slide rule

 Slide rule:

  • Slide rule was invented by an English mathematician named Wialliam Oughtered in 1620SA.D.

  • Slide rule has 2 rulers engraved with numbers.

  • The purpose of slide rule is for calculations of trigonometry, sum, differences, multiplication, etc.

  • The features of slide rule are as follows:

    a) it is the first analog computing device.                                     

        b) it is based on John Napier principle.

        c) A slide rule does not depend on electricity or 



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