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 471
mMM/mmmmma Figs. 4,505 and 4,506.—Spot welding.—This is the process of joining or fusing together elec-trically two or more metal sheets or parts without any preparation of stock. Mechanically itis equivalent to riveting, but it is stronger and can be done much more quickly andeconomically. The…
Electrical engineering
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