J.T. Desaguliers (1683–1744)

Crédit image: John Theophilus Desaguliers (pronounced day-za-güly-ay) (12 March 1683 – 29 February 1744) was a natural philosopher born in France. He was a member of the Royal Society of London beginning 29 July 1714. He was presented with the Royal Society's highest honour, the Copley Medal, in 1734, 1736 and 1741, with the 1741 award being for his discovery of the properties of electricity. He studied at Oxford, became experimental assistant to Sir Isaac Newton, and later popularized Newtonian theories and their practical applications. He has been credited as the inventor of the planetarium, on the basis of some plans he published.