Handbook for motion picture and stereopticon operators . e whole of thefilm has been wound out of the top box into thereceiving box, or until the scene is completed. Reloading. The now empty box on top replaces the receiv-ing box, which latter is marked Exposed andput into the carrying case. A box of unexposedfilm is again put in the camera and everything isready for another exposure. It must be understood that the film which ispulled out of the top box, to be threaded throughthe camera, is not wasted, for to the end of theunexposed sensitive film is spliced, in the dark-room, a piece of film,
Handbook for motion picture and stereopticon operators . e whole of thefilm has been wound out of the top box into thereceiving box, or until the scene is completed. Reloading. The now empty box on top replaces the receiv-ing box, which latter is marked Exposed andput into the carrying case. A box of unexposedfilm is again put in the camera and everything isready for another exposure. It must be understood that the film which ispulled out of the top box, to be threaded throughthe camera, is not wasted, for to the end of theunexposed sensitive film is spliced, in the dark-room, a piece of film, say, 5 feet long, to protect itfrom the light and facilitate the threading of thecamera. Old, spoiled film will answer, of course. In photographing any scene or subject one ofthe main things to guard against is the passing ofextraneous objects into or across the field of thelens very close to the camera, thus obliterating theentire view for the time being. Some one oughtalways to be suitably stationed to see that this doesnot happen. 22 Motion Picture. ROTARY LENS CAMERA. Operators Handbook 23 Jenkins Rotary Lens Camera. The advantages of a constantly-moving film arevery manifest. If pictures could be photographedupon a moving negative, it would make a flexibleinstrument, one capable of making a very greatnumber of pictures per second. Thus: If thelight from the object being photographed is causedto travel downward at the same speed as the film,that is, so that it shall not (until cut off entirely)depart from the position it occupied when it firstimpinged upon the film, the result will be a sharp,properly-exposed picture. A camera designed andconstructed in which lenses of the same focus arecaused to rotate about a common axis gives su-perior results at very high speeds, permitting thephotographing of objects in too rapid motion forthe ordinary motion-picture camera. By meansof proper gears, etc., the film is caused to travelat the back of the camera in the same direction andi
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