Quotation from: General Science

Written by: Bertha M. Clark


When very powerful motors are necessary, the field magnet is so
arranged that it has four or more poles instead of two; the armature
likewise consists of several portions, and even the commutator may be
very complex. But no matter how complex these various parts may seem
to be, the principle is always that stated in Section 309, and the
parts are limited to field magnet, commutator, and armature.


[Illustration: FIG. 231.--A modern power plant.]

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