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 79
inding. External Resistance or Slip Ring Motors.—In largemachines, and those which must run at variable speed, such asis required in the operations of cranes, hoists, dredges, etc., it is ALTERNATING CURRENT MOTORS 1,337 advisable that the regulatingresistances be placed exter-nally to the motor.…
Electrical engineering
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