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 84
SWITCHING DEVICES 1,603 were quite adequate for the service for which they were de-signed. These circuits are controlled with ease and certaintyby the oil switch.
Electrical engineering
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