Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 284
ntinuously until rundown, on make or break of circuit. Relay Bells.—Where bells are to be operated at a consider-able distance a relay is usually employed, especially in the caseof large heavy duty bells requiring considerable energy to oper-ate them, ELECTRIC BELLS 2,375 Ques. What is a relay?… … RELAY /\ / \ \ CONTACT / CONTACT ARM-* PP/> ppPPfta. Yprpprr/ ^V^4 ARMATURE ^toj^^cI3 .XRELAY\ SPRING PIVOT PUSH BUTTON LINE BATTERYCONSIDERABLE DISTANCE AUXILIARY CIRCUIT Fig. 3,256.—Elementary relay bell and connections. The relay here shown is in principleidentical with the telegraph relay.…
Electrical engineering
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