Wiring diagrams of electrical apparatus and installations (1913)
McGraw-Hill · New York, McGraw-Hill Book Company · leaf 150
current is carried by the cut-outcoil in series with it. The heater raises the temperature of the glower, and as the temperaturegoes up its resistance decreases until the current reaches such a value that the cut-out coilopens the heater circuit. The ballast is a resister with a high temperature…
Electric wiring
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