William Ougthered invent Slide Rule in 1622!
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AnswerThe slide rule was invented by William Oughtred in 1625. AnswerWe do not know the precise year. A circular slide rule was invented by William Oughtred some time about 1620, and a design of a similar slide rule by Delamain was printed in about 1630. The straight slide rule seems to have been invented later, some time around 1650.
William Oughtred and others developed the slide rule in the 17th century based on the emerging work on logarithms by John Napier.
William Oughtred was the inventor of the Slide Rule which allowed mathematical operations such as multiplication and division to be calculated by reading values from graduated scales. Slide rules were still commonly used in the 1970's and early 1980's but with the invention of modern electronic calculators, the use of the slide rule has declined.
William Oughtred (1574 - 1660) was an English mathematician and scholar. He used previous work by Napier, Gunter, and Delamain design a circular slide rule. This made approximate calculations much easier and faster than other methods of the time. The slide rule was reinvented in a sliding bar format in the 1650s. In addition to making calculations easier, the slide rule made teaching of logarithms more understandable.
The slide rule was invented during the period of 1620-1650 by William Oughtred, based on the earlier invention of the Gunter scale by Edmund Gunter. The original slide rule is said to have been circular, and come about 1620 or 1625. The straight slide rule is said to have been invented around 1650.