. The Street railway journal . NHW ELECTRO-PNEUMATIC (OXTROL with automatic means for preventing the admission of too muchcurrent to the motors, thus not only effecting a saving in theamount of current used but also insuring smooth operation oftrains. Instead of employing a drum controller, operatedelectropneumatically as heretofore, the new system c(jmprisesa series of switches which are individually operated by electro-pneumatic appliances similar in character to those employedl>y the Union Switch & Signal Company in operating its electro-]jneumatic signaling system. The electropneumatic
. The Street railway journal . NHW ELECTRO-PNEUMATIC (OXTROL with automatic means for preventing the admission of too muchcurrent to the motors, thus not only effecting a saving in theamount of current used but also insuring smooth operation oftrains. Instead of employing a drum controller, operatedelectropneumatically as heretofore, the new system c(jmprisesa series of switches which are individually operated by electro-pneumatic appliances similar in character to those employedl>y the Union Switch & Signal Company in operating its electro-]jneumatic signaling system. The electropneumatic switchesare operated progressively, the valves being arranged to admitair to the respective operating cylinders at predeterminedperiods and at a rate to insure graduated acceleration of thetrain, at the same time guarding against sudden rushes ofcurrent. The organization is such that excessive current can-not be admitted to the motors, and this not only protects the. LOW TROLLEY BASE motors themselves from undue strains but prevents sudden andabnormal movements in acceleration. The valves may be ad-justed so that any required degree of acceleration may be ob-tained. The details of the apparatus have all been thoroughlyworked out and tested in connection with the apparatus of theseveral Westinghouse companies, and have survived longperiods of practical operation. The manufacturers claim,therefore, that while the present organization of the apparatusin itself is new, it is made up of elements that have been sub-jected to severe tests in commercial service, thus involving nofeatures of uncertainty as to the practical operation of the newsystem. The Westinghouse interests have merely availed them-selves of the results of the engineering skill and experience of May i6, STREET RAILWAY JOURNAL. 749 their several different industries in order to select and applywhat, in their judgment, comprised the best features for effect-ing the operations requi
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
