John Henry Poynting Biography

John Henry Poynting

(Monton, 1852-Birmingham, 1914) British physicist.After studying in Manchester and at Trinity College in Cambridge, John Henry Poynting was successively a laboratory assistant at Owens College, a professor at Mason College and a professor of physics at the University of Birmingham, a position he held until the end of his days.

John Henry Poynting

J.H.Poynting investigated electromagnetic waves and the theory of James Clerk Maxwell.The Poynting vector, which he described in 1884, expresses the direction and magnitude of the energy flow of the electromagnetic field.He observed the pressure exerted by radiation, and claimed that astronomically it could have a considerable effect.

He also made a determination of Newton's gravitational constant following the method of the balance devised by Henry Cavendish, and obtaining a value very similar to the modern accepted.His works include The mean density of the Earth (1894), A textbook of Physics (1899, together with JJ Thomson), The properties of matter (1902) and Unscientific materialism .

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