# 1911 Encyclopædia Britannica/Oughtred, William

**OUGHTRED, WILLIAM** (fl. 1575–1660), English mathematician, was born at Eton, and educated there and at King's College, Cambridge, of which he became fellow. Being admitted to holy orders, he left the university about 1603, and was presented to the rectory of Aldbury, near Guildford in Surrey; and about 1628 he was appointed by the earl of Arundel to instruct his son in mathematics. He corresponded with some of the most eminent scholars of his time on mathematical subjects; and his house was generally full of pupils from all quarters. It is said that he expired in a sudden transport of joy upon hearing the news of the vote at Westminster for the restoration of Charles II.

He published, among other mathematical works, *Clavis Mathematical* in 1631, in which he introduced new signs for certain mathematical operations (see Algebra); a treatise on navigation entitled *Circles of Proportion*, in 1632; works on trigonometry and dialling, and his *Opuscida Mathematica,* published posthumously in 1676.