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VARIOUS APPARATUS 77
repairs or adjustments, because problems are likely to arise before engineers and service men may be reached. In order to understand and develop an intimate knowledge of the apparatus that is placed in his care it is imperative that the projectionist have at least an elementary understanding of electricity. To those who are familiar with the standard apparatus it is needless to indicate that the mechanism is very delicate and must be handled with care. It is as much an instrument as a machine. The man who handles it must therefore be more than a labourer. He must be part artist and part engineer.
With present recording methods, for example, in order to secure the best sound-projection results, it is necessary to vary the volume according to the record. It becomes important, therefore, that projectionists rehearse the picture that is to be projected in order to establish the proper sound value for the theatre. Someone in responsibility should watch the performance to insure proper tone value through the varying attendance at the theatre. Such a person should be familiar with the A, B, and C volume set-up as established by the installation engineers, so that he may understand the scope and possibility of the volume control.
Distributors furnish a cue sheet, which indicates certain volume changes, and projectionists should follow this cue sheet for the best results. Observation should be made of the sound variations indicated on the cue sheet. This, together with the rehearsal of the picture in the theatre proper, should guide the judgment of the person who is held responsible for proper tone value.
It is likewise extremely important, if the best results are to be obtained, that the manager of a theatre attend the first performance on the opening day of each new programme. After the first performance changes should be made when they may improve the results. The entire success of sound pictures and the satisfaction of the public