International Library of Technology · Scranton, International Textbook Co. · leaf 431
erably higher resistance after the lamp has beenrunning an hour or two than when the lamp is first started.Now, the voltage across the shunt coils is equal to the volt-age across the arc, and if the arc is to be maintained at thesame length, some means must be provided for keeping thepull exerted… … Shunt Cq//s 8 S 1 o- Fig. 35. coefficient, i. e., a resistance that increases but very littlewith an increase in temperature. When the coils becomeheated, the pull of the shunt coil decreases, but the pull ofthe series coils also decreases, because they become heatedand, being of copper, increase…
Electrical engineering
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