[Electric engineering.] . Fig. 56. used. Fig. 56 shows another method of accomplishing thesame result by using a special porcelain insulator that ismade for this purpose. 18 ELECTRIC LIGHTING. 89 SPECIAL APPLICATIONS OF ARC LAMPS. 102. Before leaving the subject of arc lamps we willtake up, briefly, a few of the special applications to whichthe arc lamp has been put. Arc lamps are extensively usedfor stage illumination in theaters, for photo-engravingwork, blueprinting, searchlights, or, in fact, any workwhere a strong light is necessary. For most of this work,.

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