Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 206
considerably in-creased, as notedby the additionalweights required tobe added to bal-ance the currentsattractive force.The strongest pullwill take place when the middle of the iron core nearlycoincides with the middle of the solenoid,as when they coincide the greatest numberof the currents magnetic… … Fig. 175.—Weighingthe Magnetic Attrac-tion of a Solenoid forits Iron Core. Fig. 176.—Automatic Cir-cuit Breaker. When the current becomesexcessive the magnetic fieldof the few series turns of wireattracts a solenoid which re-leases a spring and the switchopens. with its core. Thisprinciple is…
Electricity · Magnetism
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