. Journal of electricity, power, and gas . Each end of the switch dial is provided with a limitswitch D which is automatically operated by the switcharm to open the circuit of the solenoid when the resistanceis entirely cut in or out, protecting the apparatus in case thesolenoid is left energized when the arm has reached its ex-treme point of travel. There are no high speed revolvingparts which, due to their inertia, continue to cut in resistanceafter the controlling circuit has been opened. As comparedwith motor operated rheostats, this device possesses the fol-lowing advantages: Costs less,
. Journal of electricity, power, and gas . Each end of the switch dial is provided with a limitswitch D which is automatically operated by the switcharm to open the circuit of the solenoid when the resistanceis entirely cut in or out, protecting the apparatus in case thesolenoid is left energized when the arm has reached its ex-treme point of travel. There are no high speed revolvingparts which, due to their inertia, continue to cut in resistanceafter the controlling circuit has been opened. As comparedwith motor operated rheostats, this device possesses the fol-lowing advantages: Costs less, admits of closer regulation ofresistance, requires no attention, requires less space, islighter in weight, and can be made self-contained. Repairsare much simpler and can be more quickly made, and the costof maintenance is less. Fig. 1. CR 179-100 ampere ratchet driven fleldrheostat switch. arm is rigidly fastened to a wheel with a toothed rim. Pawlsfastened to the common core of the two magnets (AA), Fig. 2,engage the toothed rim of the
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Keywords: ., bookcentury1800, bookdecade1890, bookidjo, booksubjectelectricity
