In the early days of TV, the Baird System used installed an 'Electron' camera in a studio. With this, as indeed with the Marconi-EMI system, the technical television process was entirely different to previous methods, in that scanning was carried out by purely electronic means without the use of any moving parts (Fig. 1). In the Marconi-EMI system, the 'Emitron' camera was used, a device which was described in 1936 as the 'electric eye' (Fig. 2). A lens, representing the eye's cornea, cast an image of the scene to be transmitted upon a specially-prepared plate, which was a close imitation of the retina, and which was placed at the wide end of a cathode-ray tube.
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