American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 198
in the figure. This action openssounder s, because of the resistance of the extra relay r, which reduces the strengthof current in the sounder to such an extent that its armature is withdrawn. The same action, however, which has caused the opening of the sounder s atonce closes r\ which, owing to… … 164 AMERICAN TELEGRAPHY. operation. The act of opening tlie sounder s opens the western circuit at n. There-by, relay E, in the western circuit, is opened. When r closes it is seen that its arma-ture closes the local circuit lb at its armature contact point «, so that, although therelay R is…
Telegraph
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