. Motion picture electricity. nd 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 poor con-stant potential transformer, in fact it would not do at all,unless a given number of lamps were always burning atthe same time, because the voltage would fluctuate upand down as the number of lamps were decreased orincreased. CONSTANT POTENTIAL WINDINGS In view of the for
. Motion picture electricity. nd 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 poor con-stant potential transformer, in fact it would not do at all,unless a given number of lamps were always burning atthe same time, because the voltage would fluctuate upand down as the number of lamps were decreased orincreased. CONSTANT POTENTIAL WINDINGS In view of the foregoing it becomes necessary to placethe primary and secondary coils of a constant potentialtransformer very close together and, as a matter of fact,modern transformers are built in sections with the pri-mary and secondary windings sandwiched between eachother and in some instances the windings are one on top MOTION PICTURE ELECTRICITY 53 of the other as illustrated in Figs. 22 and 23, in order tominimize the magnetic Fig. 22
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