vacuum tube

Walter Schottky and the Image Potential Energy

Walter Schottky and the Image Potential Energy

On July 23, 1886, German physicist Walter Hermann Schottky was born. Schottky played a major early role in developing the theory of electron and ion emission phenomena. He invented the screen-grid vacuum tube in 1915 and the pentode in 1919 while working at Siemens, co-invented the ribbon microphone and ribbon loudspeaker in 1924 and later made many significant contributions in the areas of semiconductor devices, technical physics and technology. Schottky’s father was…
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Enabling Radio Broadcast of Sound – Lee De Forest and the Audion

Enabling Radio Broadcast of Sound – Lee De Forest and the Audion

On August 26, 1873, American inventor Lee de Forest was born. He is credited more than 180 patents. In 1906, de Forest invented the Audion, the first triode vacuum tube and the first electrical device which could amplify a weak electrical signal and make it stronger, making radio broadcasting, television, and long-distance telephone service possible, among many other applications. Lee De Forest was born in Iowa to parish priest Henry Swift De Forest; his…
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