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

batteries.

source:wikipedia.org

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