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Mechanical television
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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 scan the scene and generate the video signal, and a similar mechanical device at the receiver to display the picture. This contrasts with vacuum tube electronic television technology, using electron beam scanning methods, for example in cathode-ray tube (CRT) televisions. Subsequently, modern solid-state liquid-crystal displays (LCD) and LED displays are now used to create and display television pictures.
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 which 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 1.5 inches (3.8 cm) square, with 48 scan lines, at a frame rate of 7.5 frames per second.
Ernst Ruhmer demonstrating his experimental television system, which was capable of transmitting 5×5 pixel images of simple shapes over telephone line
Ernst Ruhmer demonstrating his experimental television system, which was capable of transmitting 5×5 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
405-line television system
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The 405-line monochrome analogue television broadcasting system was the first fully electronic television system to be used in regular broadcasting. The number of television lines influences the image resolution, or quality of the picture.
Marconi 405-line mirror TV set from 1936.
Marconi 405-line mirror TV set from 1936.
A mock-up of a 1930s EMI Emitron 405-line television camera, constructed for the 1986 BBC drama Fools on the Hill
A mock-up of a 1930s EMI Emitron 405-line television camera, constructed for the 1986 BBC drama Fools on the Hill
A British Murphy 405 line TV from 1951.
A British Murphy 405 line TV from 1951.
General Electric 950 colour wheel television receiver, manufactured in 1946 for CBS 405-line field-sequential colour system.
General Electric 950 colour wheel television receiver, manufactured in 1946 for CBS 405-line field-sequential colour system.