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 26
asecond brass buttonE, and carbon cup A. THE TELEPHONE 2,119 The space between the two cups is filled with coarse granules ofcarbon C. The buttons A and B constitute the electrodes of thetransmitter. The electric current from the battery passes fromone to the other of the electrodes, through the… … Fig. 2,920.—Standard bi-polar hand receiver. The winding of the coils is done with silkcovered copper magnet wire. The outside terminals are soldered to metal strips whichare insulated and extend to the cord terminals within the shell. The magnet is a singlepiece, being formed from a bar of magnet…
Electrical engineering
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