Sir John Sealy Edward Townsend, FRS (7 June 1868 – 16 February 1957) was a mathematical physicist who conducted various studies concerning the electrical conduction of gases (concerning the kinetics of electrons and ions) and directly measured the electrical charge. He was a Wykeham Professor of physics at Oxford University.The phenomenon of the electron avalanche was discovered by him, and is known as the Townsend discharge.
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