. Electric railway journal . omes in contact with the axle notchedto prevent slipping on the latter. mine whether or not the bend has been removed. Thisloss of time and energy is considerable, as an axle mustsometimes be tested as many as ten times before it ispronounced straight. With the hydraulic apparatus itrequired about forty-five minutes to straighten anaxle, while now we are able to straighten one in tenminutes, the saving being due in part to the fact thatthe wheel press is power driven. October 19, 1918 Clear the Track for Berlin 703 Short-Cut for Finding CombinedResistance of Multip
. Electric railway journal . omes in contact with the axle notchedto prevent slipping on the latter. mine whether or not the bend has been removed. Thisloss of time and energy is considerable, as an axle mustsometimes be tested as many as ten times before it ispronounced straight. With the hydraulic apparatus itrequired about forty-five minutes to straighten anaxle, while now we are able to straighten one in tenminutes, the saving being due in part to the fact thatthe wheel press is power driven. October 19, 1918 Clear the Track for Berlin 703 Short-Cut for Finding CombinedResistance of Multiple Circuits Simple and Fairly Accurate Graphical Method forDetermining the Value of Several Resistances,Connected in Parallel WITH certain practical problems, especially thoseconnected with distribution systems, it is fre-quently necessary to calculate the combined resistanceof several circuits connected in parallel. When thereare a large number of these circuits, the standardmethod of calculation becomes somewhat tedious. A. 3 2 GRAPHICAL DETERMINATION OF RESISTANCE OPMULTIPLE CIRCUITS considerable amount of this routine work can be elimi-nated by using the following graphical method.* The method is best illustrated by the solution of apractical problem. Let us find the combined resistanceof an overhead trolley system consisting of two trolleywires for two parallel tracks fed from a common trolley wires have a resistance of 1\ and 8 ohmsrespectively and the feeder 4 ohms. The solution of the problem as indicated in the ac-companying diagram consists of drawing four lines witheach pair including an angle of 60 deg., along the firstline OA lay off the resistance of the first trolley wire,74 ohms equal to ORit then along the third line OC, layoff the resistance of the second trolley wire 8 ohmsequal to OR2, draw the line R^-R^, this intersects thesecond line OB at E and the distance OE measured to thesame scale as was used in laying off the previous values *This graphi
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