Electricity experimentally and practically applied; a book for the beginner and for the practical man, principles, experiments, practical applications and problems (1910)
Ashe, Sydney Whitmore · New York, D. Van Nostrand company · leaf 247
iameter of thecommutator of the meter armature, by substituting gravity^^ brushesfor the old type of spring H^2 brush, Fig. 292, by providing a^^^T ball-shaped armature and cir- ^^^r cular field coils, and by reduc- ^Hg^^^^ ing the air gap and the amount ^^^^ . ^^ of copper required. The meter iS ■… … Fig. 290.—Type C, T. R. W. Fig. 292. — Spring Brushes,T. R. W.
Electricity · Electrical engineering
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