Henry and Hora's modern electricity; a practical working encyclopedia (1915)
Henry, James. [from old catalog], Hora, Karel Jan, 1881- [from old catalog] joint author · Chicago, Laird & Lee, inc. · leaf 195
ECTRICITY The circuit breaker 146. The circuit breaker is a safety device, whichautomatically opens a circuit when the current exceeds agiven value. The excess-ive current sets up a mag-netic force which over-comes the power of aspring holding two contactpieces together, and theircontact is broken.… … out, consisting of an electro-magnet so designed and placedthat one of the extensions of a divided pole-piece is fixed ELECTRICAL ENGINEERING 193 opposite every point where contact has to be broken. If themagnetic lines of force are projected at right angles to thespark current, the spark is…
Electrical engineering
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