Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 385
hed to a cradle or arm, which can bemoved to properly shift the brushes; hence the name rocker arm. In some makes of dynamos the brushes, afterbeing rocked to the neutral point, need not be again adjustedfor any change in load. The neutral point in these ma-chines is made practically constant by… … Fig. 354.—Shifting the Position of the Brushes,3—Koload. 2—Half load. 1—Full load. ARMATURES. 367 high potential used in arc light dynamos a small amoimt ofsparking at the brushes is permissible. 340. Causes of Sparking.— 1. Brushes are not set at the neutral point. They shouldbe rocked till this…
Electricity · Magnetism
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