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 49
ation com-prises systems so arranged that several telephones may beconnected on one line allowing one or several bells to ring, orone telephone to be cut off while the other is holding conver-sation, or several telephones to be cut off. Fig. 2,948 shows how two stations may be connected for… … !LI5TEN!N& key MAINSTATION!; WLDGL Of PLUNGER GENERATORAffMATuREMAGNETS
Electrical engineering
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