The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 39
after theinducing current has ceased. To avoid the last-mentionedtrouble, it is also necessary to prevent the armature makingactual contact with the iron cores, because if the magneticcircuit is, as it were, short-circuited in this manner the magneticflux, termed residual magnetism, is liable to… … Yoke Fig. 10 INTRODUCTORY 17 in which are inserted core-fins of brass wire, projecting veryslightly from the ends of the cores. When an electro-magnet has to be used in a circuit of highresistance, the number of turns of wire on the coils shouldbe large, in order that the total magnetic effect…
Telephone
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