Excerpt from Telecasting and Color
Some of the first television pictures were produced by the use of a rotating disc which contained a series of small holes. The disc mechanically broke a picture down into small parts. These small parts were transformed into electrical impuls... es and sent to the receiver. A similar rotating disc was used at the receiver to reassemble the picture. This process was known as mechanical scanning. It proved that pictures could be transmitted electrically, but the picture quality was poor.
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