john ambrose fleming

Science Dictionary
Fleming, Sir John Ambrose 1849-1945.  
British physicist and electrical engineer who devised the first electron tube in 1904. His invention was essential to the development of radio, television, and early computer circuitry. Fleming also helped develop electric devices designed for large-scale use, such as the electric lamp.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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