The New International Encyclopædia/Greaves, John

GREAVES, John (1602-52). An English mathematician. He was born at Colemore, graduated at Balliol College, Oxford, in 1621, and in 1630 became professor of geometry at Gresham College, London. He traveled in Southern Europe and Egypt, collecting valuable manuscripts, gems, and coins, and making measurements of monuments. In 1643 he was chosen professor of astronomy at Oxford, but five years later was ejected by the Puritans. Among his numerous works were: Pyramidographia, or a Discourse on the Pyramids (1646); A Discourse of the Roman Foot and Denarius (1647); and Elementa Linguæ Persicæ (1649).