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OPERATING MANUAL m
being made. It can readily be understood that under these circumstances it would not be feasible, without danger of serious confusion or early obsolescence of the information, to attempt to cover all the details of operation of these various kinds of equipment as they have to be attended to by the projectionist, nor is it necessary, since complete operating instructions directly applicable to the type of equipment concerned are furnished with each installation.
There are, however, certain fundamental principles and procedures of operation and maintenance which underlie and are common to all the different detailed procedures, and which are not subject to early change; it is these which I wish to emphasize in this chapter and the next. These fundamentals cannot be disregarded without serious risk of apparatus trouble; on the other hand, if the theatre staff has an intelligent grasp of them the minutiae of handling particular switches and levers will present little difficulty and will be largely self-evident.
Here is something I would like to emphasize, for it is indeed important: Neither the management nor the projectionists can afford to neglect the operating instructions supplied with each equipment by the manufacturer, for they have been carefully prepared on the basis of years of experience with such apparatus, and they are complete and up-to-date and adapted to the special conditions connected with each of the different types of equipment. Occasionally an installation may present one or two special features that are not covered in the standard instruction book; in such cases the installation and service engineers will give the necessary directions.
The operation of the equipment is not in any way a difficult, complicated, or mysterious matter, but it does require intelligence and a conscientious regard for the instructions furnished by the manufacturer; when troubles