International Library of Technology · Scranton, International Textbook Co. · leaf 422
he arc by separatingthe carbons. At thesame time, contactis broken between dand e, so that all themain current passesthrough the seriescoils. The shuntcoils 5 are connectedfig. 32 across the arc, and as soon as the arc is started, they set up a pull in oppositionto the series coils. When the arc… … 60. If the rod should stick, the arc gradually growslonger until the pull of coils S brings d down against e andthus cuts out the lamp. The object of using the resistance Ris to enable the lamp to start up. If R were not present,the resistance of the path p-h-d-e-B would be so low com-pared with…
Electrical engineering
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