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76 SOUND MOTION PICTURES
a vague idea of the effect in the theatre. Management must be capable of judging the desired amount of volume necessary for the film shown.
Screen surfaces deteriorate very rapidly. Hence, whenever it is possible, the screens should be changed every ninety days. They collect dust and dirt and consequently lose reflecting power.
Disks may warp if they are laid on an uneven surface. Therefore, great care must be exercised in setting them down even temporarily. They should not be lifted or carried in stacks, nor be placed on any surface which does not equal in width the circumference of the disk itself. Overlapping the edge of a flat table or shelf may sometimes cause bending. The long experience of the Victor Talking Machine Company in packing disks for shipment has enabled them largely to overcome warping in transit. Should warping exist, however, the difficulty may be overcome by placing disks temporarily on a true flat surface. Disks are also affected by dampness as well as by heat, and therefore they must not be placed close to a radiator. They should rather be kept in a place that is both dry and reasonably cool.
Care must be taken in handling the disks to obviate scratching.
The advent of sound motion pictures in the theatre has elevated the projectionist to a position of greater importance by making him a supervisor of maintenance. It behooves projectionists to realize the opportunity that is theirs in making a careful study of the entire subject of sound, particularly as it pertains to projection, in order that they may take the fullest advantage of their opportunities. It is eminently important that every projectionist understand clearly the equipment that is placed in his charge, if he is to give the best that is in him to his work. A good mechanic should understand how to make temporary