50.1 MB (1.5 MB compressed)
3593 x 4878 pixels
30.5 x 41.4 cm ⏐ 12.0 x 16.3 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
J. Ambrose Fleming. Portrait of Sir John Ambrose Fleming (1849-1945), British physicist and inventor of the thermionic valve (diode). In 1877 Fleming joined Cambridge University and worked for J.C. Maxwell. In 1881 he became professor of mathematics and physics at University College, Nottingham. During 1882-5 he was a consultant to Edison's London office. He became professor of electrical technology at University College, London in 1885 and in the 1890s worked with G. Marconi. In 1904 Fleming invented a thermionic valve which allowed electricity to flow in one direction only. It was used in early electronics but has been replaced by solid-state devices.
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