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1924 __ John Logie Baird Television Transmission
John Logie Baird (1888-1946)
Comment : Scottish engineer John Logie Baird is known as the first person to demonstrate a working television. Baird experimented with the Nipkow disk (a mechanically spinning disk with a series of equally distanced circular holes of equal diameter drilled in it) and demonstrated that a semi-mechanical analogue television system was possible with the transmission of a static image of Felix the Cat in London in 1924. This early system was highly primitive -- images were difficult to view and transmitted only in shades of brown. On October 30, 1925 first moving image was transmitted -- a grainy image of a ventriloquists dummy’s head. (Compiled from various sources)THE "TELEVISOR" - SUCCESSFUL TEST OF NEW APPARATUS.Members of the Royal Institution and other visitors to a laboratory in an upper room in Frith-Street, Soho, on Tuesday [26 January] saw a demonstration of apparatus invented by Mr. J.L. Baird, who claims to have solved the problem of television. They were shown a transmitting machine, consisting of a large wooden revolving disc containing lenses, behind which was a revolving shutter and a light sensitive cell. It was explained that by means of the shutter and lens disc an image of articles or persons standing in front of the machine could be made to pass over the light sensitive cell at high speed. The current in the cell varies in proportion to the light falling on it, and this varying current is transmitted to a receiver where it controls a light behind an optical arrangement similar to that at the sending end. By this means a point of light is caused to traverse a ground glass screen. The light is dim at the shadows and bright at the high lights, and crosses the screen so rapidly that the whole image appears simultaneously to the eye. For the purposes of the demonstration the head of a ventriloquist’s doll was manipulated as the image to be transmitted, though the human face was also reproduced. First on a receiver in the same room as the transmitter and then on a portable receiver in another room, the visitors were shown recognizable reception of the movements of the dummy head and of a person speaking. The image as transmitted was faint and often blurred, but substantiated a claim that through the "Televisor" as Mr.Baird has named his apparatus, it is possible to transmit and reproduce instantly the details of movement, and such things as the play of expression on the face. (The Times London, Thursday 28 January 1926, p.9 column C)
Urls : http://www.mztv.com/newframe.asp?content=http://www.mztv.com/baird.html (last visited ) http://www.bairdtelevision.com/ (last visited )

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