Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 155
re, forming a complete 148 MOTION PICTURE ELECTRICITY series circuit from the first line wire through whateverportion of the rheostat may be in series with the dialswitch, through the arc lamp back to the line. Fig. 84 shows the simplest form of adjustable rheostatand the cheapest to manufacture.… … Fig. 85 ent spiral resistance units all connected together at thetop, but the lower ends are connected to independent sin-gle pole switches. The switches are, however, connectedtogether at the lower end. An examination of this ar-rangement will prove to you that if the connections aremade as…
Motion picture theaters · Electric lighting
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