Television first appeared as a mechanical apparatus, that consisted of a spinning disk and photo-electric vacum tubes.
The video "signal" was taken from a standard radio receiver and the audio "signal" was taken from a separate radio receiver.
The video quality was very poor due to the mechanical process involved.
The world's earliest television recordings
Pioneers and developers of Mechanical Television
Paul Gottlieb Nipkow
John Logie Baird
Charles Francis Jenkins
Additional Information
Mechanical television
Early television stations
Early / Mechanical Television Systems
Principals of mechanical television explained
Russian booklet on building your own mechanical television set
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