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64 SOUND MOTION PICTURES
II. Installation
It is the purpose of this chapter to deal with the equipment and operation of the standard sound devices. Perhaps the reader will get a clearer picture of the problem if we follow an installation through from its inception to its completion. In this manner the scope of the work will make familiar the many details involved. For illustration, the Western Electric Sound Projection System is selected here. This system is furnished by the Electrical Research Products Incorporated, who supervise the installation, instruct the local personnel in the details of operation, and provide service inspection during operation. Figure 3 shows general installation layout for sound motion pictures, Western Electric System.
Of prime importance in preparing a theatre for sound projection is the initial engineering survey, because it determines the type of system that is to be installed as well as any requirements for special treatment. In this connection it may be pointed out that each theatre presents a problem in itself and must be considered as such. The survey engineer first studies the acoustical facilities and requirements. From these he gathers pertinent information on which his recommendations are based. His survey is studied by a special staff at the laboratory, who organize the final conclusions.
In the projection room the engineer becomes familiar with the power supply, as to voltage frequency (if A. C.) and capacity, so that he can measure properly the load that is to be used. Where existing projection machines are used, the type, the condition, and the angle of projection must be carefully noted. The question of proper spacing between machines, to permit the proper attachment of sound apparatus, is an important factor, if operation is to be safe and competent. Room must be found for the amplifying