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Mechanical television
Videos
Mechanical television or mechanical scan television is an obsolete television system that relies on a mechanical scanning device, such as a rotating disk with holes in it or a rotating mirror drum, to
Watching a homemade mechanical-scan television receiver in 1928. The televisor (right), which produces the picture, uses a spinning metal disk with a
Watching a homemade mechanical-scan television receiver in 1928. The televisor (right), which produces the picture, uses a spinning metal disk with a series of holes in it, called a Nipkow disk, in front of a neon lamp. Each hole in the disk passing in front of the lamp produces a scan line that makes up the image. The video signal from the television receiver unit (left) is applied to the neon lamp, causing its brightness to vary with the brightness of the image at each point. This system produced a dim orange image
Ernst Ruhmer demonstrating his experimental television system, which was capable of transmitting 5 by 5 pixel images of simple shapes over telephone l
Ernst Ruhmer demonstrating his experimental television system, which was capable of transmitting 5 by 5 pixel images of simple shapes over telephone lines, using a 25-element selenium cell receiver (1909)
Baird and his television receiver
Baird and his television receiver
Jenkins Television Co. rotating disk television camera, 1931
Jenkins Television Co. rotating disk television camera, 1931
Test Card F
Videos
Test Card F is a test card that was created by the BBC and used on television in the United Kingdom and in countries elsewhere in the world for more than four decades. Like other test cards, it was us
Mechanical television
…Block diagram of General Electric mechanical scan television system, Radio News (April 1928) Color television A color televisor. A test card (the famous test card F) can just be seen through the lens on the right. John Baird's 1928 color television experiments had inspired Goldmark's more advanced field-sequential…
Off-air screen capture of BBC Test Card F, as seen on BBC1 between 17 February 1991 and 4 October 1997. (September 1993 Variant Picture)
Off-air screen capture of BBC Test Card F, as seen on BBC1 between 17 February 1991 and 4 October 1997. (September 1993 Variant Picture)
Original transparency of the central image created for Test Card F. (1966 Variant)
Original transparency of the central image created for Test Card F. (1966 Variant)