Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 206
Fig. 175.—Weighingthe Magnetic Attrac-tion of a Solenoid forits Iron Core. 176.—Automatic Cir-cuit Breaker. ■VVhen 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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