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180 Tales Told Out of School
seeing a picture in which an intoxicated man thought he saw the houses and trees moving? To produce this is a simple matter. The operator of the camera gently rocks it to and fro as he grinds the crank. The tripod on which the camera is mounted is provided with a special attachmentthat makes the taking of such a scene very easy. The effect of a storm-tossed ship can be obtained in the same way, although a much better method, and one that is necessary if players appear in the scene, is one produced mechanically by having the set built on rollers in the studio, the motion being supplied by husky stage hands. In this case the camera is stationary.
Now for the more difficult tricks of the camera. Many of these are done
by what is known as "double exposure." It is by this means that an actor can appear on the same film in two different roles, or a ghost can be made to appear.
When a dual role is to be played, a scene is taken during which only half of the film is exposed as it is run through the camera. The light is shut off at the lens to prevent exposing the other half of the film. The action is confined to that side of the set which will register on the film. Every part of this scene is timed to the second.
Then the player who is to appear in" the two roles makes up for the second part, and takes his position in the other side of the set, from whence the light had been shut off. The film is rewound to the point where the scene began. The half, of the film already exposed