Sound motion pictures : from the laboratory to their presentation (1929)

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46 SOUND MOTION PICTURES employs four horns, two mounted at the line of the stage and pointed upward toward the balconies, and two mounted at the upper edge or above the screen and pointed downward. This arrangement has been found to give good distribution throughout the house. The proper placing of the horns is important in talking motion pictures, because it is responsible for the illusion that the sound is coming directly from the mouth of the horn; that is, from the screen. If the horns are replaced by a loudspeaker which is of otherwise identical characteristics, but which radiates its sound over a wide angle the sound has a tendency to appear to be coming from a point some distance back of the screen. The displacement results in a destruction of the illusion. Both the Vitaphone and Movietone systems are now controlled by the Electrical Research Products Company, a subsidiary of the Western Electric Company. The "flashing lamp" system of recording used in Movietone is the special invention of Theodore Case, who with the financial aid and encouragement of William Fox, of the Fox Film Corporation, brought to the industry a synchronization of sound photographed on the film itself. This method is said to be a great improvement over the earlier experiments in sound and talking pictures. Electrical Research Products furnishes its theatre equipment in a sufficient variety of types and sizes to make it readily adaptable to all classes of theatres. It is not practicable to specify in detail what equipment is associated with each size of house, as acoustic conditions and other local factors make it necessary to consider each case separately. Equipment may be obtained for either Vitaphone or Movietone or for both. Other attachments are obtainable as accessories to these systems. They include microphone