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 469
ems of electric welding are based upon the principleof causing a current of electricity to pass through a high WELDING 3,123 resistance, thereby generating heat. There are, however, im-portant differences in the manner in which the heat so generatedis applied to the welding of metals. The amount of… … Fig. 4,502.—Thomson welder. Portable, pressure and cut out, mercury slide, with regulatorand automatic break switch. Copper wire No. 23 to No. 15 Power 1.5 kw. Time,fraction of second. To operate, move lever at right to position shown; hold back leversat center and insert wire; return lever at…
Electrical engineering
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