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The Camera Department
illusion of the two characters fighting on the top or ledge of a real building, overlooking actual streets.
Double exposure is also used when a player is acting a dual role, i. e., playing two parts in the same picture.
For example, if an actor is playing one part as Dick and the other as John and if, as Dick, he has to talk to John (himself) in the same scene, the photographing is done in the following manner:
A chalk-line is drawn on the floor of the set, dividing it into two sections. The cameraman blocks off one-half of the camera lens, so that only half of the film is exposed. The exposed portion of the film photographs the action of Dick and other characters acting on one half of the set.
Then, the exact amount of film used in the scene is ground backwards in the magazine of the camera, and the other side of the film is exposed. The actor, playing the dual role, changes his costume and make-up and dons those of the second role. Then the cameraman blocks off that side of the lens through which he has been photographing and, with the same film, photographs the action of the players on the other half of the set.
Every movement and gesture of the entire scene is timed carefully so that, when the action on the second half of the set is taken, Dick's and John's actions will match perfectly. The photographing of double exposures has to be done many times and it is extremely delicate and difficult work.
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