Cine-film projection : a practical manual for users of all types of 16-mm. and narrow gauge film pro (1952)

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Quite a large number of projectors may be connected to any lighting system, but this is theoretically wrong, and you are ad- vised to use a proper power-point whenever there is one avail- able. If there is no such point then you should connect your mains-lead to the fuse-box. The wires may usually be held in position by the fuses themselves, and without having to undo any screws. But always choose a pair of fuses supplying a cir- cuit having no other load than that of your own equipment. The cable used for the loud-speaker may have any number of wires inside it, and because of the difficulty in replacing a broken speaker-lead connector, you must pay special attention to pre- venting the latter from ever becoming loose. To replace a con- nector to a six-core cable is not an easy job—there are 36 dif- ferent ways you can do it, but only one is the correct way. And three or four of the other ways are likely to blow a valve or short-circuit something. However, most speaker-leads consist of a two-core cable, and may be reversed without causing any damage. Sometimes it is necessary to use a three-core cable in conjunction with a two-pin adaptor and Fig. 12 shows how this should be done. 5r.o.WI WIRES MUST MOT P&OT&UDE TO PIN Fig. 12 How to connect a 3 core cable to a 2-pin adaptor. 56