Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 146
e theline voltage is so high it would be practical to use ahigher voltage at the arc so as to employ some of theenergy to increase the illumination instead of wasting itin the reducing resistance. Previous information on thissubject has made you acquainted with the fact that it isnot practical… … 550 V. CONSTANT POTENTIAL POWER OR STREET RAILWAYCIRCUIT\~FUSES SWITCH ARC 50 VOLTS as high pressure as can practically be used to advantageat the arc, and a drop of 50 volts is the ideal pressure atwhich a direct current projector arc should operate. The resistance of a projector arc circuit is,…
Motion picture theaters · Electric lighting
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