The standard electrical dictionary; a popular dictionary of words, terms, and phrases, used in the practice of electrical engineering (1897)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · New York, H. W. Henley & co. · leaf 462
Fig. 288. Relay or Local Circuit. local battery comes into operation to work a sounder, etc. Whenthe current ceases on the main line the switch opens and throwsthe local battery out of action. The switch is termed a relay, q. v. Along main line may thus produce strong effects at distant…
Electricity
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