Motion picture handbook; a guide for managers and operators of motion picture theatres ([c1916])

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610 MOTION PICTURE HANDBOOK fingermarks. There is but one term which properly can be applied to this kind of work, and that is disgusting. By all means keep your stereopticon slides clean. Unless you do the result on the screen will instantly brand you as a sloppy workman. Slides may be cleaned by breathing on them While cold, polishing quickly afterward, or by washing with wood alcohol and polishing. Another essential to good stereopticon projection is perfect steadiness of the picture on the screen. Providing the operating room floor be solid and the machine properly Figure 296. anchored, there is ordinarily no lack of steadiness of the picture where a dissolver is used, but when using a single lamp, with a double slide carrier, many operators will move the carrier more or less in process of taking out and putting in a slide. This, of course, causes the slide in the other compartment of the carrier to move, and, as it is being projected at the time, it of course follows that the picture on the screen also moves. What a truly absurd effect is produced when one is watching, for instance, the projection of a picture of a city and, due to the ignorance or carelessness