Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 165
ary 32-candlepowerlamps were installed in the regular way and the arc usedas a switch, or as a dimmer for the incandescent lamps.When the arc is maintained at 50 volts, the incandescentlamps receive only 60 volts, giving a correspondinglylower candlepower, in fact the filament will slightly… … MOTION PICTURE ELECTRICITY 159 lumination from the incandescent lamps as well as fromthe arc, thus utilizing some of the usual waste in the rhe-ostat with direct-current systems, but if any great degreeof illumination is to be had from the incandescent lamps,they would necessarily have to be made…
Motion picture theaters · Electric lighting
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