John Ambrose Fleming, British physicist

John Ambrose Fleming, British physicist

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Credit: EMILIO SEGRE VISUAL ARCHIVES/AMERICAN INSTITUTE OF PHYSICS/SCIENCE PHOTO LIBRARY

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Caption: John Ambrose Fleming (1849-1945), British physicist and engineer. Fleming was educated at University College London and Cambridge University. He is best-known for inventing the vacuum tube in 1904. This was a crucial advance in electronics, and was used in radios and other electrical equipment for many decades. Fleming, who worked as a consultant for both the Marconi and Edison companies, was knighted in 1929. He also gave many lectures, including the Royal Institution Christmas Lectures of 1894, 1901, 1917, and 1921. This photograph is from 'Fifty Years of Electricity: The Memoirs of an Electrical Engineer' (Fleming, 1921).Restrictions:

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