Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 53
ilsthrough which direct current is flowing from a smalldirect-current generator. 46 MOTION PICTURE ELECTRICITY Largealternating current generators are usuallymade with a number of rotating magnet poles,alternately of north and south pole magnetism. On account of the difficulty of securing a… … INSULATION Fig. 14 pieces of an alternating-current generator are usu-ally magnetized by copper coils, through which di-rect current flows. The magnet poles of an alternating-currentgenerator have to be supplied with direct current,which is usually furnished by a very small direct-current dynamo or…
Motion picture theaters · Electric lighting
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