Lee De Forest

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Noun1.Lee De Forest - United States electrical engineer who in 1907 patented the first triode vacuum tube, which made it possible to detect and amplify radio waves (1873-1961)
References in periodicals archive ?
Inventor Lee de Forest was using a lamp in an experiment when he noticed sound waves had an effect on the flame.
A calendar kept by Fessenden at the time does not mention it, and there are no newspaper accounts, even though a similar exercise conducted the next spring by rival Lee De Forest created a nationwide stir.
Dear Editor, Chris You-ett's revelation (Memory stack of facts on computing, Post, Jan 12) that the thermionic valve was invented by Prof Tommy Flowers in 1938 will cause surprise, not to say consternation, among those of us who have long believed that it was the work of Sir Ambrose Fleming in 1904 and also of Doctor Lee de Forest in 1907.