Sir John Ambrose Fleming FRS

Died aged c. 96

Sir John Ambrose Fleming FRS (29 November 1849 – 18 April 1945) was an English electrical engineer and physicist who invented the first thermionic valve or vacuum tube, designed the radio transmitter with which the first transatlantic radio transmission was made, and also established the right-hand rule used in physics. He was the eldest of seven children of James Fleming DD (died 1879), a Congregational minister, and his wife Mary Ann, at Lancaster, Lancashire, and baptised on 11 February 1850. A devout Christian, he once preached at St Martin-in-the-Fields in London on evidence for the resurrection. In 1932, he and Douglas Dewar and Bernard Acworth helped establish the Evolution Protest Movement. Fleming bequeathed much of his estate to Christian charities, especially those for the poor. He was a noted photographer, painted watercolours, and enjoyed climbing the Alps.

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Commemorated on 4 plaques

Sir Ambrose Fleming 1849-1945 scientist and electrical engineer lived here

9 Clifton Gardens, Maida Vale, Westminster, W9, London, United Kingdom where they lived

Sir Edward Frankland FRS 1825-1899, Chemist & Sir John Ambrose Fleming FRS 1849-1945, Physicist Worshipped here in their youth.

High Street / Middle St, Lancaster, United Kingdom where they worshipped

"Greenfield". Former home of Sir John Ambrose Fleming, M.A., D.Sc., F.R.S. (1849-1945) Inventor of the thermonic valve. Designed Poldhu Wireless Station for Marconi, used in his first transatlantic transmission to St. John's Newfoundland in 1901. He designed and lived in this house 1926-1945.

, Sidmouth, United Kingdom where they lived

Professor Sir John Ambrose Fleming 1849-1945 Inventor of the diode radio valve, pioneer in wireless telegraphy. He was a friend of this Observatory and lived in Sidmouth, 1926-1945

, Sidmouth, United Kingdom where they visited