The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 345
ach line circuit isclosed by a spring through its main local battery beforethe closing of the circuit at the opposite end of thelever through the extra local battery, and remains closedtill after the latter circuit is opened. Thus when thelever of 7 is attracted, the circuit of MB is closed at… … THE ELECTRIC TELEGRAPH. 329 sulation, which is similarly indicated at various otherpoints. The main local battery MB is connected with theeastern line through relay R\ and MB with the westernline through R\ each battery being connected with theearth as shown. When a message from the east is to be…
Electricity · Magnetism
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