John Michell, Henry Cavendish, and John Smeaton blue plaque in Dewsbury

Revd John Michell BD. FRS 1724-1793 geologist and astronomer. Rector of Thornhill 1767 - 1793. He experimented on magnetism and astronomy, also making a Torsion balance to weigh the world. His visitors here included Henry Cavendish, William Hershel, Joseph Priestey and John Smeaton.

Henry Cavendish FRS (10 October 1731 – 24 February 1810) was a British natural philosopher, scientist, and an important experimental and theoretical chemist and physicist. Cavendish is noted for his discovery of hydrogen or what he called "inflammable air". He described the density of inflammable air, which formed water on combustion, in a 1766 paper "On Factitious Airs". Antoine Lavoisier later reproduced Cavendish's experiment and gave the element its name.A notoriously shy man, Cavendish was nonetheless distinguished for great accuracy and precision in his researches into the composition of atmospheric air, the properties of different gases, the synthesis of water, the law governing electrical attraction and repulsion, a mechanical theory of heat, and calculations of the density (and hence the weight) of the Earth. His experiment to weigh the Earth has come to be known as the Cavendish experiment.

Source: dbpedia

John Smeaton, FRS, (8 June 1724 – 28 October 1792) was an English civil engineer responsible for the design of bridges, canals, harbours and lighthouses. He was also a capable mechanical engineer and an eminent physicist. Smeaton was the first self-proclaimed civil engineer, and often regarded as the "father of civil engineering".He was associated with the Lunar Society.

Source: dbpedia

John Michell (25 December 1724 – 29 April 1793) was an English natural philosopher and geologist whose work spanned a wide range of subjects from astronomy to geology, optics, and gravitation. He was both a theorist and an experimenter.Michell was educated at Queens' College, Cambridge and later became a Fellow of Queens'. He obtained his M.A. in 1752 and B.D. in 1761. In 1760 he was elected a Fellow of the Royal Society, in the same year as Henry Cavendish. In 1762 he was appointed Woodwardian Professor of Geology, and in 1767 he became rector of Thornhill, West Yorkshire, near Dewsbury, where he died.

Source: dbpedia

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