Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 145
Fig. 79 sistance becomes very large, and as the arc requires thesame drop, namely, 50 volts, it is evident that about 500volts has to be consumed in the reducing and steadying d. c. 220 V. CONSTANT POTENTIAL … STEADYING AND REDUCINGRESISTANCES COMBINED -170 VOLTS Fig. 80 resistance. Fig. 81 illustrates such a connection andsystem. MOTION PICTURE ELECTRICITY 139 Arc Voltage Limit.—It would seem that where theline voltage is so high it would be practical to use ahigher voltage at the arc so as to employ…
Motion picture theaters · Electric lighting
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