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30 MOTION PICTURE HANDBOOK trouble through so doing. Of course, where lighter wires are used, a smaller fuse must be installed. A good rule is "fuse ten amperes over the current you pull under normal conditions." Be careful, however, that the main house fuses (fuses attached to main house switch) are equal in capacity to all circuit fuses, plus your operating fuses, else they might blow and leave every- thing in darkness. Link fuses (Fig. 10, A) are excellent for operating fuses, as they are cheap and easily installed. When using plug or cartridge fuses promptly throw them away when they blow out. They are of no more use to you or any one else, and, if they get mixed with the good ones, it sim- ply causes aggravation. Keep the various sizes separate and the whole lot in some handy place near the switchboard. Be sure and have your fuse connections tight. Loose con- nections heat and very little heat will melt a fuse. A dirty contact is equivalent to a loose one. WIRE SYSTEMS. There are two wire systems in general use in incandescent lighting, viz.: the multiple arc and the three-wire. But there are two others occasionally encountered, viz.: the multiple series and series multiple. To this must be added the high potential system, which is, in practical use, a multiple arc. What is known as a series arc system is used exclusively in arc lighting and is of no interest to the operator except that he be able to know it when he sees it, so that he will let it severely alone. A projec- tion arc lamp cannot be connected into this system under any conditions. In the following diagrams the circle represents the dynamo and the X lamps; -j- indicates positive and — negative. X X X X ^ ^ ncn Fig. 11 is a diagram of the series arc system. This system carries about hfty volts pressure for each lamp in the circuit.