Wiring diagrams of electrical apparatus and installations (1913)
McGraw-Hill · New York, McGraw-Hill Book Company · leaf 150
Fig. 215. Fig. 214.—Internal connections of a single glower and Nernst lamp. At the beginningthe resistance of the glower is very high so that very little 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…
Electric wiring
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