William Oughtred, English mathematician

William Oughtred, English mathematician

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Caption: William Oughtred. Portrait of William Oughtred (1575-1660), English mathematician and cleric. Oughtred was Educated at Eton College and later at Cambridge University, England. He was ordained as a priest in 1603. His clerical post gave him time to work on mathematics. In 1631 he published the Clavis mathematicae (the key to mathematics). Oughtred also introduced a number of mathematical symbols, such as the 'X' for multiplication and the sin and cos notation for trigonometry. He also invented the circular slide rule and the rectilinear slide rule. The latter was the main calculating device for engineers until the late 1950s.

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Keywords: author, circular slide rule, clavis mathematicae, inventor, mathematician, multipication sign, oughtred, portraits, slide rule, surname o, trigonometry symbol, william

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