International Library of Technology · Scranton, International Textbook Co. · leaf 322
w vand the breaker may betripped by hand at anytime by pulling downon the knob w. Thebreaker shown is a dou-ble-pole, but each sideof the circuit is inde-pendent of the other.For example, if thereshould happen to be ashort circuit on the line,one side may be closedand then the other. Ifthe short… … Pig. 32. RHEOSTATS. 25. Every direct-current dynamo should be equippedwith a rheostat in its shunt field, so that the generatorvoltage may be adjusted. Alternators are usually provided § 17 ELECTRIC LIGHTING. 31 with a rheostat in series with their separately excited field,as well as with one in…
Electrical engineering
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