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Edison was certain that his phonograph cylinder rolls were better than the flat discs. The arm moving across the disc had some distortion as it was hinged and traveled at an angle to the disc. The cylinder was read by a needle always moving parallel to the cylinder. Therefore the cylinder roll would succeed in the market place and the disc would fail.
Anyone remember the early CBS attempt to produce a color TV picture by a rotating a 3 colored wheel in front of a synchronized special picture?
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