Thomas Simpson Evans

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Thomas Simpson Evans (1777–1818) was a British mathematician.



Evans, eldest son of the Rev. Lewis Evans (1755–1827), by his wife, Ann Norman, was baptised in August 1777. He was named after Thomas Simpson, the mathematician. [1]

Lewis Evans (1755–1827) was a Welsh mathematician.

Thomas Simpson FRS was a British mathematician and inventor known for the eponymous Simpson's rule to approximate definite integrals. The attribution, as often in mathematics, can be debated: this rule had been found 100 years earlier by Johannes Kepler, and in German it is called Keplersche Fassregel.

In or about 1797 Evans appears to have taken charge of a private observatory at Blackheath belonging to William Larkins, formerly accountant-general to the East India Company in Bengal. After the death of Larkins, 24 April 1800, he was taken on as an assistant by Nevil Maskelyne at the Royal Observatory, Greenwich, but resigned the post in 1805. [1]

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East India Company 16th through 19th-century British trading company

The East India Company (EIC), also known as the Honourable East India Company (HEIC) or the British East India Company and informally as John Company, Company Bahadur, or simply The Company, was an English and later British joint-stock company. It was formed to trade in the Indian Ocean region, initially with Mughal India and the East Indies, and later with Qing China. The company ended up seizing control over large parts of the Indian subcontinent, colonised parts of Southeast Asia, and colonised Hong Kong after a war with Qing China.

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In that year, or perhaps in 1803, Evans was appointed mathematical master under his father at the Royal Military Academy, Woolwich. Here he continued until 1810, when he accepted the mastership of the mathematical school at New Charlton, near Woolwich, which office he vacated in 1813 to become master of the mathematics at Christ's Hospital, London. His attainments won for him the degree of LL.D. (from what university is not known) and the fellowship of the Linnean Society. [1]

Royal Military Academy, Woolwich military academy in Woolwich, in south-east London

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Evans died 28 October 1818, aged 41. [1]


Evans left a completed translation of Antonio Cagnoli's ‘Trigonometria piana e sferica,’ besides other translations of scientific works and a collection of unfinished papers in several branches of philosophy. He also contributed some articles to the Philosophical Magazine , among which were: [1]

Antonio Cagnoli Italian astronomer

Antonio Cagnoli was an Italian astronomer, mathematician and diplomat in the service of the Republic of Venice. His father Ottavio was chancellor to the Venetian governor of the Ionian Islands.

<i>Philosophical Magazine</i> scientific journal established in 1798

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Evans's library was considered a valuable collection of mathematical and philosophical works. [1]


By his marriage in 1797 to Deborah, daughter of John Mascall of Ashford, Kent, Evans had five children:

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  1. 1 2 3 4 5 6 7 Wikisource-logo.svg "Evans, Thomas Simpson". Dictionary of National Biography . London: Smith, Elder & Co. 1885–1900.

Wikisource-logo.svg  This article incorporates text from a publication now in the public domain : "Evans, Thomas Simpson". Dictionary of National Biography . London: Smith, Elder & Co. 1885–1900.