Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 430
404 ELEMENTARY LESSONS ON [chap, xii. zc^ one pole of which is put to earth, and the other com-municates with a key K. This key is arranged (like thatin Fig. 164), so that when it is depressed, so as to senda signal through the line, it quits contact with thereceiving instrument at its own end. The… … Fig. 162. receiving instrument G at the distant end, where it pro*duces a signal, and returns by the earth to the batterywhence it started. A similar battery and key at thedistant end suffice to transmit signals in the oppositedirection to G when K is not depressed. The diagramis drawn as if G were…
Electricity · Magnetism
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