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 210
Pigs. 3,139 and 3,140.—Oscilation transformers. This style of transformer consists of a windingof heavy wire on a wooden rack and variable contact is made with these wires by means ofmetal clips to which are attached conducting wires. When the transformer is operated thesecondary coil sets up high…
Electrical engineering
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