1. De Forest - Noun
2. De Forest - Proper noun
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)
Source: WordNetBut before the earlier date, De Forest sought and obtained a high vacuum in the audions used as amplifiers, and observed that when the vacuum was too low the blue glow effect occurred at from 15 to 20 volts. Source: Internet
De Forest's initial Audions did not have a high vacuum and developed a blue glow at modest plate voltages; De Forest improved the vacuum for Federal Telegraph. Source: Internet
Disney used Pat Powers' Cinephone system, created by Powers using Lee De Forest 's Phonofilm system. Source: Internet
However the Fleischers used a De Forest sound system and the sound was not completely synchronized with the film. Source: Internet
In 1906, Lee De Forest brought out a vacuum tube device which he called the " audion ". Source: Internet
In its Audion leaflets, the De Forest company even warned against any operation which might lead to too high a vacuum. Source: Internet