Handbook for motion picture and stereopticon operators . MENT. Developing Machines. Having exposed the film in the camera, the nextstep is development. To develop this strip, carry-ing on its gelatine surface some 1600 latent im-ages every 100 feet, is worthy the effort of themost patient photographer, for each picture musthave the same density, remain without stainthroughout, and must be handled so as not to beabraided in any part of its length. Drum Method. The method most in use consists in winding thefilm spirally while dry upon a large drum, the lat-ter supported free to rotate in a semic
Handbook for motion picture and stereopticon operators . MENT. Developing Machines. Having exposed the film in the camera, the nextstep is development. To develop this strip, carry-ing on its gelatine surface some 1600 latent im-ages every 100 feet, is worthy the effort of themost patient photographer, for each picture musthave the same density, remain without stainthroughout, and must be handled so as not to beabraided in any part of its length. Drum Method. The method most in use consists in winding thefilm spirally while dry upon a large drum, the lat-ter supported free to rotate in a semicylindricaltray into which the developing fluid is drums are usually 3 feet or more in diame-ter and 6 feet or more in length, and driven by amotor, although a crank may, of course, be drum 2 feet in diameter and 2 feet long holds100 feet of film laid close. Pin Cross-Arms. No developing device is, however, so suitable fortravel (and many operators prefer it at home) asa pair of brass cross-bars having vertical pins 28 Motion Picture. Operators Handbook 29 driven tightly therein, and known as the pin-jray method. Around these pins the film iswrapped in concentric spirals. The whole is thenset down in the tray and treated much as a large
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