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Electricity experimentally and practically applied; a book for the beginner and for the practical man, principles, experiments, practical applications and problems (1910) Ashe, Sydney Whitmore · New York, D. Van Nostrand company · leaf 57
e by themovement of the armature. The tele-graph system consists of a line, Fig. 56,a series of transmission keys, Fig. 57, anda series of magnets termed relays, Fig.J—. 58, all connected in cir- ^^^^ni—^ ^^^^ ^\!Cii a battery, as in ^^^J^^ © Fig. 56. The line isgrounded at both endsFig. 55.—… … Fig. 54. — House BellCircuit (M. E. S.Co.). j/—Ilis tip Fig. 56. — Telegraph Line. their armatures to the poles of the magnets. In so doing,the armature closes a local circuit consisting of a batteryand a sounder, Fig. 59, which intensifies the click of therelay that might other-wise be… Electricity · Electrical engineering
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