Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine (1914)

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CH. XIII] INSTALLATION OF ARC LAMPS 505 FIG. 270. WIRING OF THE ARC LAMP FOR PROJECTION. For full explanation, see fig. 3 and fig. 40. ing post of the rheostat a suitable wire is carried to the positive binding post of the arc lamp, that is to the binding post for the upper carbon. This puts the rheostat, or other balancing device in one wire, or in series, not in parallel, or across both the wires of the circuit. In securing the ends of the wires to the binding posts, scrape them, and twist the strands, then make a loop and put under the binding screw of the switch as described for the attachment cap. Usually for the rheostat, and the arc lamp, the wires are twisted and kept straight, then inserted into a hole, and a set screw turned down upon them. If flexible cord or cables are used for these connections, the wires on the end, after being scraped clean should be twisted and soldered, then none of the strands will escape to lessen the carrying capacity, or possibly to make a short circuit.