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630 RICHARDSON'S BLUEBOOK OF PROJECTION
projectionist cannot expect to delay locating the fuse cabinet of a strange projection room until after a fuse burns out. He should know every fuse in the place, and what circuit it controls, before he threads up his first reel of film for an audience.
In addition it is necessary to understand all transmission lines, where they originate, through what connection boxes they run, and where they terminate. This information is absolutely necessary to finding trouble. Naturally, the time to gather it is before trouble has occurred, and not while an audience is waiting impatiently for repairs to be completed.
The details of projection room wiring should always be thoroughly charted. Therefore this is one type of information that will give a new projectionist no trouble if previous incumbents have done their duty. The newcomer will find a detailed chart inside every fuse cabinet, usually pasted up inside the door, showing what circuit each fuse controls and what size it should be. Spare fuses are often placed inside each fuse cabinet; if not, the fuse chart should explain where they can be found. Connection boxes are similarly charted, or if not, each wire or pair of wires is tagged. Connection terminals to amplifiers and other sound equipment are usually labelled by the manufacturer, or they are numbered, and an explanatory diagram is pasted up inside the door or cover. Where neither is the case the wires should be tagged with full information.
In some projection rooms the necessary information relating to the projection room wiring is posted in the form of the sound manufacturer's installation diagram. This should never be trusted without further investigation. Such diagrams only tell what the manufacturer wanted. The conditions existing at the time of installation may have made some departure from that standard necessary. In fact, the actual wiring may be very different from the standard. Sometimes, however, such drawings are modified with pen and ink to show departures from standards, and where this has been done they are probably trustworthy.