Show Genesis Genes of Radio Tube TuL The first erst elec electric ric light was developed developed devel devel- opt 1 by Sir Humphrey Davy That was years ears ago Later Thomas Thomas' A. A Edison developed the incandescent t filament lamp and from It It discovered what is known as the Edison effect Quite a number of years Inter Professor Professor Pro Pro- fessor Fleming an Englishman first utilized the the Edison effect in detecting radio signals ills Ois detector tube was called alle the Fleming valve I. I Later er Dr Lee DeForest discovered n that a third 1 element now element now called 1 the grid made grid made n a much more sensitive detector detector detector de de- de- de of at radio signals Around tills thia remarkable little lamp Jamp has been n b built lt the modern broadcasting structure |