Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 140
er understanding of theforegoing references I refer you to the accompanying il-lustrations. TO CIRCUIT- GLOWER rt MATCH Fig. 72 Fig. 72 shows a Nernst lamp glower connected to anelectric circuit with a lighted match below it, the flame ofwhich heats the glower so that it becomes a conductor, and… … 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…
Motion picture theaters · Electric lighting
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