Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Ucijht. Fig. 175.—Weighingthe Magnetic Attrac-tion of a Solenoid forits Iron Core. 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 exten-sively used to oper-ate the feedingmechanism in arc lamps, Fig. 177; toautomatically open switches in electriccircuits when the current becomes ex-cessive, as in the circuit breaker,
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Ucijht. Fig. 175.—Weighingthe Magnetic Attrac-tion of a Solenoid forits Iron Core. 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 exten-sively used to oper-ate the feedingmechanism in arc lamps, Fig. 177; toautomatically open switches in electriccircuits when the current becomes ex-cessive, as in the circuit breaker, , and in commercial instrumentsfor measuring current and pressure,as in Fig. 191. 195. Magnetic Circuits.—Asimple magnetic circuit, ^j 42, of uni-form cross-section is represented bythe solid iron ring in A, Fig. 178,around which a number of turns ofinsulated wire have been direction of the current and re-sulting polarity of the coil is shown,while the arrows indicate the directionof the lines of force around the ring,which is the same as that in which the 188 PRACTICAL ELECTRICITY.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1901
