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 452
be expandedwhen the heat is applied, and being a poor conductor, the heat is notdistributed to the adjoining sides of the seam, hence the heated partswill rise up and leave hollow spaces underneath. When this happens,leaving places where the lead does not rest in the board the lead meltsmore… … Fig. 4,477.—Edge burning. In this case no feed lead is necessary, but a slight jar has tobe given to start the first bead on either the vertical or the horizontal seam. WELDING 3,107 CHAPTER LXXXIVWELDING The art of forcing two pieces of metal into union by means ofheat and pressure, is known as…
Electrical engineering
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