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John Bonnycastle (1750?-1821) Teacher of mathematics and author.

John Bonnycastle was born at Whitchurch, Buckinghamshire, in about 1750. Nothing is known of his family or early life, but he went to London where he established an Academy. At the age of 19 he married a Miss Rolt, but she died young. He became a tutor to the two sons of the Earl of Pontefract at Easton in Northumberland. In about 1783 he was appointed Professor of Mathematics at the Royal Military Academy, Woolwich, where he remained until his death on 15 May 1821.

He was a prolific writer, and for the early volumes of Rees's Cyclopaedia wrote about Algebra, Analysis and Astronomy.

His son, Charles Bonnycastle (1796-1840) became Professor of Mathemtics at the University of Virginia.

Writings

 * The Scholar's guide to Arithmatic, 1780
 * Introduction to Algebra, 1782
 * Introduction to Astronomy, 1786
 * Euclid's 'Elements'  with notes, 1789
 * ''A Treatise on Plane and Spherical Geometry, 1806
 * A Treatise of Algebra, 1813