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 194
xujo z ?o 3 £™o am iw H>m i a rn r* era r-<o m>»l3 £3 a? 1 o a r H H n … IQI 192 MODERN ELECTRICITY 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…
Electrical engineering
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