Modern practice of the electric telegraph : a handbook for electricians and operators (1874)
Pope, Frank L., 1840-1895 · New York : D. Van Nostrand · leaf 69
batteries is thrown on shortcircuit, through the local return wire, burning the re-lays, exhausting the batteries, and interfering with theoperation of every wire connected with them. Thecause of these troubles being somewhat obscure, it might,for a considerable time, escape detection. 86. Local… … Fig. 31. represented at M and M; S and S are the sounders orregisters, E and E are the local batteries. B is a simplebutton or circuit closer (62), having four connectingpoints, 1, 2, 3, 4. When the button is in the position1, 2, as shown in the figure, the relay M works thesounder S, and the relay…
Telegraph
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer04inte-485-256.webp)
