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If the electricity put up significant changes, then some of the light bulbs on the device would light up and some wouldn't. The concept never took off though because of two reasons. The prototype had too many loopholes, and the disk never scanned a clear live-action picture
In 1921, a 14 year-old Philo Farnsworth was working on his father's farm when he came upon his idea for the television. While he was mowing hay in rows, he realized that an image could be reproduced almost immediately when an electron beam scanned a picture in horizontal lines. This was a breakthrough, but it was shared. A Russian immigrant named Vladimir Zworykin at the same time invented a camera in which an image was focused through a lens to an end of a tube lined with many photoelectric cells...
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