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

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VARIOUS APPARATUS 75 not only entirely familiar with the results which the system may be expected to give, but also informed as to how to originate requests for obtaining the changes which he may wish. Upon the ability and conscientious efforts of this observer depends in a large measure the success of the sound-picture programmes. The installation personnel remain at the theatre until it is evident that the equipment can be handled in a commendable manner. When this stage has been reached the installation is transferred to the service organization of the Electrical Research Products Incorporated. III. Service and Maintenance The function of the Service Department is implied in its name. The service engineer in whose district the theatre is located is available for emergency calls at all times. In addition he visits the theatre periodically to check the equipment and recommend what minor adjustments may be necessary. He listens to the selections on the programme and makes any suggestion to the manager which may occur to him. In this manner all of the theatre systems are kept under frequent engineering supervision in an earnest endeavour to maintain the class of service which they may be expected to give. In earlier experiments horns were placed in the pit, with the idea that they would simulate the actual sound from an orchestra. Similarly, speakers were installed at the side of the screen and were found to create an imperfect illusion. Only by placing the speakers near the source of the sound can a true illusion be obtained. It has been found, furthermore, that the illusion may be more complete when the horns are placed behind a porous screen. The sound should be controlled by someone in the audience, since the projectionist is not able to get more than