. Electric railways; a treatise on the modern development of electric traction, including practical instruction in the latest approved methods of electric equipment and operation . two motors is primarily thecause of the generation of the current. The motors at first act inopposition, but one of them generates the higher voltage and fcrcesa current through the other. This current overcomes the residualmagnetism of the second motor, thereby changing its polarity andboth motors then act in series to send the current through the lowresistance path afforded by the windings. Any current passingincr
. Electric railways; a treatise on the modern development of electric traction, including practical instruction in the latest approved methods of electric equipment and operation . two motors is primarily thecause of the generation of the current. The motors at first act inopposition, but one of them generates the higher voltage and fcrcesa current through the other. This current overcomes the residualmagnetism of the second motor, thereby changing its polarity andboth motors then act in series to send the current through the lowresistance path afforded by the windings. Any current passingincreases the strength of the fields and consequently the voltages, 64 ELECTRIC RAILWAYS so tliat ahnonnal ciirrents are ijeuerated and the ])rakiiii: artion isfonseciuently severe. This generating action does not take place before tlie reverselever is thrown because the connections of the armatures and fieldsare such that any current generated by reason of the residual magnet-ism of the fields, flows in such a direction through these that thismagnetism is destrove<l. The current then ceases to flow, ^riiiscx])iains wliv ciUTent is not generated in No. 2 motor with a K tyjK*. OuterHoseCotton FIlc. .>?. IlitMiiuulii Sandfr. of controller during the change-over period when it is short-circuited,or in e(|uipments when the trolley flies oft and the controller is turne<lon. Brake Shoes. The .subject of brake shoes is of very littleimportance on the smaller cars traveling at .slow .speeds and con-trolled alone by hand brakes. On the larger high speed interurbancars, the brake .shoe (piestion becomes an important item becauseof the rapidity with which they are worn away. On such cars shoessometimes last but about one week. This means eight .shoes ])erweek ])er car or an expense of about . per car per week. Brake shoes are usually of .soft gray cast iron with ofsteel, although .some companies use very hard iron. Jliey are by means of a key to a brake
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Keywords: ., bookauthoramericanschoolchicago, bookcentury1900, bookdecade1900
