Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 59
ed by the arrows, first in onedirection, then when the current reverses in the other 52 MOTION PICTURE ELECTRICITY direction performing no work, simply keeping the ironcore excited, and the secondary coil under tension. If we should now put load on the secondary coil as indi-cated by the arc lamp… … Fig. 21 and secondary coils and these lines are therefore lost andare of no use in producing voltage in the secondary coil,allowing the voltage in the secondary to drop when thearc lamp is turned on. Therefore, you can understand that a transformerbuilt as illustrated in Figs. 20 and 21 is a very…
Motion picture theaters · Electric lighting
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