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Handbook for motion picture and stereopticon operators (1908)

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60 Motion Picture Triple Condensers. Many motion-picture machines are fitted with but two condenser lenses, although the best results are obtained with three condenser lenses; one concavo-convex and two thin double-convex separated by air space ; for motion-picture use only, however. Projecting Lenses. Have projecting lens rings in stereopticon large enough to take in 1/2, 2/3, and 4/4 lenses easily by the use of adapter rings; and in the motionpicture machine a projecting lens tube with rack and pinion, and with interchangeable lenses of different focal length. Magazines. Fire-proof metal film-boxes, or magazines, should be used on every motion-picture projecting machine, in fact, are required by the fire regulations of most cities.