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 198
ing apparatus. WIRELESS TELEGRAPHY 2,289 The Telefunken or Slaby-Arco Multiplex System.—The operation of this system depends on the principle that whenrapid electric oscillations are set up in a vertical wire, havingone end free and the other end grounded, the maximum ampli-tude or pressure of each… … Fig. 3,126.—Lodge Muirhead coherer. It is of the wheel type and consists of a steel disc D,rotating on a column of mercury M, held in the cup C. Electrical connection is made through the binding screw S and the platinum wire P; the copper brush B, bearing on theshaft L, connects with the disc D,…
Electrical engineering
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