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 247
apacity used to protect electrical apparatus against damage due toatmospheric discharges and resonance surges. The spark gaps areformed between the edges of sharp rimmed discs of non-arcing metal.These discs are insulated from each other, and from the central tube,which provides a support for the… … Fig. 2,091.-75 light Westinghouse-Cooper Hewitt mercury vapor rectifier constant currentregulating transformer. View showing assembly in case. Buttner Valve.—It is of the Xodon type employing a cathode ofmagnesium-aluminum alloy, and probably iron or lead as anode, withan electrolyte of ammonium…
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