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MOTION PICTURE PROJECTION 677
might be, the plan worked out has resulted in a very reliable and simple construction.
Fig. 281 illustrates the electrical connections of this generator.
The action of an electric generator is that the armature is revolved in the field of a magnet. As a result, current can be drawn off the armature. The amount of current is determined largely by the resistance opposing its flow. Incidentally this current flowing in the windings of the armature makes a magnet of it, and in the Transverter advantage is taken in this fact to so direct this magnetism as to oppose the strength of the fields.
As the current flow increases the armature more strongly opposes the field, with the result that over a wide range of increasing voltage the resulting current is constant.
A second pair of field coils is added and placed on a pair of auxiliary poles called interpoles, which act on those parts of the armature winding under the brushes. Their action is such as to produce sparkless commutation.
The results obtained from the Transverter are not, of course, due only to the combination of the materials and parts as outlined above but due largely to a careful proportioning of them as well as the proper selection of material. Finally, the correct performance of the machine is due to the proper positioning of the brushes on the commutator and the correspondingly correct location of the interpoles which, contrary to usual practice, are made adjustable.
The location of the brushes and the interpoles is a factory adjustment and should never be