Vacuum Tube
Initially, John Ambrose Fleming utilized his invention of the simplest diode vacuum tube to detect radio signals. This diode had a heated filament that aided in the tube's ability to pass current in one direction. However, his invention could not emit electrons and was primarily helpful in detection. These diodes were very reliable and physically stable and were therefore used on naval ships to detect signals even when the stability of the ships were compromised. Later, Robert von Lieben invented the triode vacuum tube which made it possible to amplify audio signals. It was Lieben's intention to use this device to bring us closer to a version of telephones. This triode was then refined by several physicists, resulting in its crucial use in radio transmitters and receivers. At the same time, this kind of tube helped develop the first loud speaker. In a triode, a piece of the tube called the plate was heated in addition to the filament, and this allows the tube to pass current in...
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