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Frederick Bakewell demonstrated a working laboratory version in 1851.
Willoughby Smith discovered the photoconductivity of the element selenium in 1873.
Television is a mass medium for entertainment, education, news, politics, gossip and advertising.
Television became available in crude experimental forms in the late 1920s, but it would still be several years before the new technology was marketed to consumers.
A standard television set is composed of multiple internal electronic circuits, including a tuner for receiving and decoding broadcast signals.
By the 1920s, when amplification made television practical, Scottish inventor John Logie Baird employed the Nipkow disk in his prototype video systems.
As a 23-year-old German university student, Paul Julius Gottlieb Nipkow proposed and patented the Nipkow disk in 1884.
This was a spinning disk with a spiral pattern of holes in it, so each hole scanned a line of the image.
In 1921 Edouard Belin sent the first image via radio waves with his belinograph.
In 1911, Boris Rosing and his student Vladimir Zworykin created a system that used a mechanical mirror-drum scanner to transmit, in Zworykin's words, "very crude images" over wires to the "Braun tube" (cathode ray tube or "CRT") in the receiver.