After the invention of Logarithms in 1614 A.D. William Outhtred invented the Slide Rule . This device was made on the principle of Logarithms. It consists of two graduate scales, on of the passes over the other. The scales are devised in such a way that suitable alignment of one scale against the other makes it possible to obtain products, quotients or their function by inspection. The Slide Rule was used by the engineers till 1970s. This was replace by pocket calculator.
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