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 446
terthe solder has run, to kill the borax, as it would leave a hard scaleinterfering with future filing. All flanges to be brazed to copper pipes must be of copper or what isknown as brazing metal, 98 copper to 2 of tin, as gun metal flangeswould melt before the spelter ran. The hole in the flange… … Fig. 4,469.—Brazing furnace without fire bricks. At opposite sides of the top are standardsupon which sleeves freely slide, and which are held at any desired height by thumb screws.Each sleeve carries a burner to which gas and air pipes are connected, each pipe being pro-vided with a valve for…
Electrical engineering
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