. Revised and enlarged ed. of the science of railways . stant potential method, thepressure is kept constant, andthe demands for differentamounts of power, either bycotirarrrew firrabMn^he the variatiou of the numberslots by bands of strong ^f lamps or uiotors, or by the wire. . ^ ^ variation of power demandedby a motor, are met by a variation of cur-rent. Lamps or motors are connected in mul-tiple or parallel when operated on this sys-tem. In the other system thecurrent is kept constant, andthe demand for additionalpower is met by an increase ofpressure. Lamps or motors areconnected in series
. Revised and enlarged ed. of the science of railways . stant potential method, thepressure is kept constant, andthe demands for differentamounts of power, either bycotirarrrew firrabMn^he the variatiou of the numberslots by bands of strong ^f lamps or uiotors, or by the wire. . ^ ^ variation of power demandedby a motor, are met by a variation of cur-rent. Lamps or motors are connected in mul-tiple or parallel when operated on this sys-tem. In the other system thecurrent is kept constant, andthe demand for additionalpower is met by an increase ofpressure. Lamps or motors areconnected in series so thatthe same current passesthrough all the devices whenoperated on this system. Theconstant current series systemfinds its common application in arc lighting,where the current is maintained constant andthe pressure of the circuit is made proportionalto the number of lamps to be supplied. Powercan be supplied from circuits of this character,but this system is not in general use for powerservice and finds practically no application inrailway Armature Disc, showingslots, diagram of commu-tator and one coil in placeconnected to the commu-tator. ELECTRICITY AS A MOTIVE POWER. 415
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