File:Forest Audion AM radio transmitters.jpg

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Forest_Audion_AM_radio_transmitters.jpg ‎(495 × 255 pixels, file size: 24 KB, MIME type: image/jpeg)

Some of the earliest Audion AM radio transmitters, built by de Forest around 1916. The invention of the Audion oscillator in 1912 made inexpensive sound radio transmission possible, and was responsible for the advent of radio broadcasting around 1920.

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current09:47, 18 September 2022Thumbnail for version as of 09:47, 18 September 2022495 × 255 (24 KB)Ashish kumar (talk | contribs)

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