Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 143
so that it is better toallow even greater potential drop in the steadying resist-ance, going posibly as high as 40 to 50 per cent, for verybest results. Suppose, for the sake of argument, that we allow 5,0volts at the arc and 20 volts for the steadying resistance;this makes a total of 70 volts… … Fig. 77 The standard lighting circuits, however, as alreadystated, are maintained at rlo and 220 volts; therefore wemust take care of the difference in voltage between 70actually required, and the line voltage, which we will sayis no, making a voltage drop of 40 volts. This extravoltage must be…
Motion picture theaters · Electric lighting
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