. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . n atonly about half its normal speed to generate the requiredcounter E. ]M. F., and the result is that a slow speed isobtained without the use of any resistance. When the higher speed is desired, the controller is thrownaround to the multiple notches and effects the combina-tions necessary to change the motors from series to par-allel. When they are in parallel, as shown in Fig. 20,each motor gets its full voltage of 500 and runs at fullspeed. Of course, at starting it is necessary t
. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . n atonly about half its normal speed to generate the requiredcounter E. ]M. F., and the result is that a slow speed isobtained without the use of any resistance. When the higher speed is desired, the controller is thrownaround to the multiple notches and effects the combina-tions necessary to change the motors from series to par-allel. When they are in parallel, as shown in Fig. 20,each motor gets its full voltage of 500 and runs at fullspeed. Of course, at starting it is necessary to include some §24 ELFXTRTC RAILWAYS. 29 resistance, and when changing from series to multiple, resist-ance is also cut in to prevent excessive rushes of currentand to give a smooth acceleration to the car; but this resist-ance is cut out as soon as the car gets under headway and isnot to be used on the running notches. A great many types of series-parallel controller have beenbrought out, and it would be an endless task to describe all Tro//ey • Tro//ey ^ Rci/Fig. them. All thatpies of Fig. here is to show their princi- )ecause it the student understands thesethoroughly, he should have little difficulty in tracing outany ordinary car-wiring diagram. The diagrams of carwiring are usually furnished by the controller makers tothose that use their apparatus. K8 SEniKS-P.\RALI^T:L COXTROT.,L,ER. 34. General Description.—The type K2 series-parallelcontroller brought out by the General Electric Company isone that has been very widely used on electric railways. 30 ELECTRIC RAILWAYS. § 24 The General Electric Company make several styles of whatthey designate as the type K controller. They are, how-ever, the same in general construction and principles ofoperation. In all the type K controllers one of the motorsis shunted or short-circuited during the change from series toparallel, otherwise the designation type K has no specialsignificance. The type
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