Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 180
erent car- MOTION PICTURE ELECTRICITY 173 bon setting and method of control and operation must beemployed with the alternating current where high effi-ciency, perfect illumination and regulation is to be ob-tained. The subject of the alternating current projector arc isvery simple to those who have… … many operators who understand the details and functionsof each element produce splendid results with alternatingcurrent, even with inferior current supply, carbons andcontrolling devices, whereas others produce unsatisfac-tory results having the best equipment possible at theirdisposal. 174 MOTION…
Motion picture theaters · Electric lighting
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