Practical cinematography and its applications (1913)

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206 PRACTICAL CINEMATOGRAPHY resumes its travel. The ingenious means adopted for stopping and restarting the projector will be appreciated as a great feature of the invention, and though the action may appear to be abrupt, no damage whatever is inflicted upon the film. One point about this apparatus deserves atten- tion. In the ordinary projector, if the celluloid film is stopped in the gate for a fraction of a second, and is exposed to the light, it flares up instantly, owing to the great heat emitted by the illuminant and the high inflammability of the film. As it is necessary to allow the film to stand still upon the screen in this case, after the shot has been fired, means had to be found to keep it sufficiently cool to prevent combustion. This is done by a radiator arranged around the condenser, which in itself is a special kind of cooling tank. Another noteworthy point is the way in which a still-life lantern slide is thrown upon the screen when desired. The projector carries two lenses, one for animation, and the other for still-life lantern slide work. The ordinary way of bringing the latter into use is to push the front part of the projector bodily sideways so as to bring the second lens before the condenser and the light. The objection to this method is that the rigidity of the projector is likely to be disturbed, especially after a little wear, with the result that the pro- jection of the moving pictures is apt to become