Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 144
the voltage is not neces-sarily required, and must simply be disposed of or usedup in a resistance and is a dead loss. MOTION PICTURE ELECTRICITY 137 For 60 Volts.—For a better understanding of theforegoing I offer, as an additional explanation, Fig. 77,illustrating the application of the electric… … Fig. 7l For 75 Volts.—Fig. 78 illustrates the application ofthe projector arc to a 75-volt direct current constant po-tential circuit, which is the ideal condition of operationwhere the arc is to be controlled by a steadying resistanceor ballast. For no Volts.—Fig. 79 illustrates the application…
Motion picture theaters · Electric lighting
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