Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 215
nly when the lifting lever is shifted toward the raised posi-tion. The lifting arrangement is independent of the brushes during normal running.so it can in no way affect the operation of the machine. Each brush is merely raised andlowered within its own holder so the brush position or commutation… … Shifting the Brushes.—Were it not for the difficulties encount-ered, this would be a most con-venient method of voltageregulation, since by this proced-ure the direct current voltagemay be varied from maximumto zero. It is, however, notpractical because of the excessivesparking produced when…
Electrical engineering
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