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FOR MANAGERS AND OPERATORS 25 ing of a three-wire system is seldom accomplished, though it might be balanced evenly enough on one board to show no perceptible effect through the blowing of a neutral fuse. The reasons for the installation of three-wire systems will be explained under "Wire Systems" further on. The main house switchboard should invariably be mounted on slate, marble or other insulating, non-combustible mate- rial and the whole board should be enclosed in a metal cabinet with a door having a substantial, easily manipulated latch. If the board is of considerable size it should be placed in charge of some competent man and none other be allowed to touch it. The fuses of all circuits, except the stage, exit and operating room arc lamp circuits should be located on the main switchboard. The proper place for the main house switchboard is the lobby, preferably at a point from whence a view of the stage, or curtain, may be had. The writer considers it exceedingly good practice to have the main switchboard equipped with two main switches, as follows: The main house switch which pulls everything except the exit lamps and a sub-main switch which pulls all lights it is desired to extinguish to darken the auditorium, with the exception of one circuit handled by the operator as afterward explained. Darkening the audi- torium by pulling half a dozen circuits one after another makes a very bad effect. This switch should not prevent the installation of all the regular circuit switches but be supple- mental to them. This applies to large houses only, where there are several auditorium circuits. On large switchboards it is well to label all switches plainly, indicating just what circuit they control, thus: "Proscenium," "Ceiling Clusters," etc., etc. EXIT LIGHT CIRCUITS. In some cities it is required that exit lights be operated with non-explosive oil burned in suitable lamps. If electric light is allowed for exit lamps the circuit should in all cases be controlled from the box office, never from the main switchboard, and this circuit should in no case be controlled by the main house switch. There is no telling what a nervous man will do when excited. He might pull the main house switch at an alarm of fire, thus throwing everything, in-