. . "Machin, John"@en . "John Machin"@en . . "British mathematician" . . . . . "John Machin (bapt. c. 1686 \u2013 June 9, 1751), a professor of astronomy at Gresham College, London, is best known for developing a quickly converging series for Pi in 1706 and using it to compute Pi to 100 decimal places."@en . "1752Z"^^ . . . "1686Z"^^ . .