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), 1833-1928 · New York : T. Audel & Co. · leaf 475
hen iron or steel is being welded,for which a high temperature is needed, the metal is made thepositive and the carbon the negative. In the case of lead, orany metal requiring a comparatively low temperature, thispolarity is reversed. The supply of current is generally furnished by a dynamo, and… … Fig. 4,519.—Diagram illustrating the electric blow pipe. In order to overcome the difficultyin the Benardos process of the extreme concentration of heat in the portion of the metalwhich forms one pole of the arc, apparatus has been devised by Werdmann, Zerener,and others, in which phenomenon of the…
Electrical engineering
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