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 432
on-sists of an electromagnet round which the line currentflows, and whose delicately poised armature, whenattracted, makes contact for a local circuit in which alocal battery and the receiving Morse instrument areincluded. The principle of the relay is, then, that acun-ent too weak to do the work… … Tig^ 165. a relay. Whenever a current in the line circuit movesthe tongue of the relay it closes the local circuit, andcauses the Morse to record either a dot or a dash uponthe strip of paper. The key K is shown in an. enlarged K
Electricity · Magnetism
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