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 58
36 EXPERIMENTAL ELECTRICITY … Fig. 58. —Relays (M.E. S.Co.). through all of the relays is very small, they are wound with many turns of fine wireto secure sufficient mag-netic effect. The resis-tance of the relays istherefore great, beingfrom 80 to 300 ohms.The resistance of thesounder is much lessand may be anything from 5 to…
Electricity · Electrical engineering
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