Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 140
Fig. 73 out as shown in illustration Fig. 74. The correct methodof operation, in order to prevent the glower from admit-ting too much current, is to connect a ballast or a re- -to circuit- Fig. 74 sistance in series with the glower as illustrated in Fig. 75.In this instance the ballast is enclosed… … m/wimm\mw Fig. 75 134 MOTION PICTURE ELECTRICITY Fig. 76 shows almost the duplicate condition of theNernst glower in which the arc between two carbon BALLAST OR STEADYING RESISTANCE
Motion picture theaters · Electric lighting
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