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MOTION PICTURE HANDBOOK
one side of all these switches. The switches or the contacts should be located at the most convenient point, either on the stage, by the side of the musician or in the operating room. The transparency can be so made that only the figure or name actually illuminated will be visible. This may be done by covering the whole front of the board with ground glass, on which are the figures, or names blocked out in black, as shown in the illustration, each lampi however, being contained in a light tight compartment of its own. Different colors may be obtained, if desired, by covering the various characters with light shades of gelatine or using colored globes.
In practice, I would by all means advise a double-pole singlethrow switch at AB, rather than the single-pole knife switch at C. In fact switch C would be a violation of Underwriters' rules.
Figure 311.
In Fig. 311 a battery of 36 lamps is arranged in the form of a square, with 6 lamps either way. One wire (wire A, in the sketch) is connected directly to one side of each lamp. A board is now made, containing 36 sockets, arranged in a square, with 6 s.ockets each way, the same as are the lamps. This board may be placed in any convenient location, either near the lamps or removed at a distance from them, as may be most convenient; but in any event, the other side of each one of the lamp sockets must be connected to one side of each socket as shown. We now connect the other side of each one of these sockets to wire B, as shown in the illustration, installing a double pole, single throw switch, at any convenient point in wires A, B. Both sides of the socket are now alive, one directly from wire B and the other by way of the lamps through wire A. It will be readily seen that if an ordinary plug fuse be screwed into any one socket the lamp connected to that socket by cross wire will immediately