How cathode rays affect the photographic plate
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If cathode rays within a vacuum, hit a phosphorous-covered plate of glass, the phosphors would glow. if you manipulate the cathode ray into a beam, you can cause different areas to briefly glow at command. and if you cause the cathode ray to create a pattern on the plate, using electro-magnets to direct the "stream", then the result is the basis for something we call television. (The type with the big glass picture tube, that is.)
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