Lee de Forest

Lee de Forest was an American inventor, electrical engineer, and early pioneer in electronics of fundamental importance. He invented the first practical electronic amplifier, the three-element "Audion" triode vacuum tube in 1908. This helped start the Electronic Age, and enabled the development of the electronic oscillator.

These made radio broadcasting and long-distance telephone lines possible, and led to the development of talking motion pictures, among countless other applications.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

DITDASH

Dit dah — Morse code, signaling, and the basics of getting on the air.

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