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
ofmetal on a very extensive scale. A current of electricity heatsthe abutting ends of the two objects which are to be welded,these being pressed together by mechanical force, and so ar-ranged with the electric current that there is great and rapidaccumulation of heat at the joint, in consequence of…
Electrical engineering
Internet Archive · Brigham Young University · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-69-67.webp)
