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 450
Figs. 4,474 and4,475.—Preparation of butt and lap seams for lead burning. Fig. 4,474 shows theedges of a butt seam placed together on a piece of flat board, and the seam shaved readyfor burning. The width of the shaving is governed by the thickness of the lead to bejoined. For 5 lb. lead the rear…
Electrical engineering
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