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26 MOTION PICTURE HANDBOOK eluding the exit lights, in darkness. Tap in your exit light circuit ahead of the main house switch (i. e., between the switch and the street mains) and run it directly to a switch located in the box office, where proper fuses should be in- stalled. Thence run the service wires to the various exit lamps. Exit lamps should be enclosed in a box with ground glass front on which the word "EXIT" has been blocked out in translucent red, the letters not less than five inches in height. These signs should be placed over all exits and the lights in them be kept burning at all times when an audience occupies the auditorium. It is desirable that one of the auditorium circuits, prefer- ably the ceiling lights, be controlled from the operating room, as well as from the main switchboard. This is ac- complished by running the circuit service wires from the main switchboard service switch through the operating room, bringing them past a position on the wall DIRECTLY IN FRONT OF THE OPERATOR and in easy reach from operating position. Install a sub-service switch so that the operator can reach both it and the dowser at the same tirne. Now when the signal is given the operator to start, all the circuits except that controlled by him are pulled from the main switchboard. The operator, when ready to start, pulls the above described switch with one hand as he pulls the dowser or starts the machine with the other. The effect is to darken the house and throw the picture at one and the same instant. In stopping the order is reversed and the pic- ture is off and the lights on simultaneously. It is NOT ad- visable to have all circuits handled thus, since the man at the main switchboard should be able to light the auditorium instantly, in casie of alarm, which he could not do were all circuits controlled by an operating room switch, until the operator threw in his switch. The main switchboard service switch of the circuit controlled by the operator is not touched at all—is left shut at all times except when the house is closed. STAGE SWITCHBOARDS. Stage switchboards should all be assembled at one point, preferably just to the right of the proscenium arch—the right as you face the auditorium from the stage—and mounted on