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 83
exposed tothe weather. All moving and contact parts are supported from the cast iron top andare readily removable for inspection or repair Oil Switches.—The extensive use of high pressure currentsand alternating current motors and other devices introducinginductance make it necessary to use… … 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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