He was the younger son of an old Yorkshire family, from whom he inherited at his father's death a small landed property. He entered
St Catharine Hall, Cambridge, when quite young, and soon migrated to
Trinity College. He was second wrangler and second Smith's prizeman in 1796, and a fellow of Trinity from 1798 until his marriage in 1814. He proceeded M.A. in 1799, B.D. in 1812, and D.D. in 1829.
He held for some years the living of
Walton, Hertfordshire. In 1802 he was moderator in the examinations of the university. On the foundation of the
East India College in Hertfordshire (
Haileybury) he was appointed professor of mathematics.
In 1810 he published The Principles of Fluxions,’ a manual for students, and was about the same time elected a Fellow of the Royal Society. In 1813, on the death of the
Rev. John Venn, Dealtry was made rector of
Clapham. Belonging to the evangelical party in the
Church of England, he took part in the controversy which arose on the formation in 1810–12 of the
British and Foreign Bible Society, which he supported.
On 25 February 1830 he received a prebendal stall at
Winchester Cathedral, and was made chancellor of the diocese; in 1845 he was appointed archdeacon of Surrey. He died at
Brighton on 15 October 1847.
From Venn’s
Adm. sizar at ST CATHARINE'S, June 29, 1792.
S. of William, of Swinefleet, Yorks. [B. 1775, at Whitgift.] School, Hull (Mr Milner). Matric. Michs. 1792.
Migrated to Trinity, Mar. 28, 1793, age 17; Scholar, 1795; B.A. (2nd Wrangler) 1796; second Smith's Prize; M.A. 1799; B.D. 1812; D.D. 1829.
Fellow, 1798.
Tutor, 1801-6. F.R.S., 1810.
Professor of Mathematics at the East India College, Haileybury, 1805-13.
R. of Clapham, Surrey, 1813-c. 1843.
R. of Hatfield Broadoak, Essex, 1814-16.
R. of Watton, Herts., 1816-30.
R. of Clothall, 1816-30.
Chancellor of the dio. of Winchester, 1830-45.
Archdeacon of Surrey, 1845-7. Preached the funeral sermon at Holy Trinity Church, Cambridge, the Sunday after the death of Charles Simeon (1836). Author, The Principles of Fluxions, 1810; also Sermons, pamphlets, etc.
Died Oct. 15, 1847, at Brighton.
(Cant. Act Bk.; D.N.B.; Scott, MSS.)