. Electric railway gazette . to be operated bythe railway power current: the secondary cur-rent developed by these generators to be utilizedto lower the potential In the cables and pipes tozero, with respect to the surrounding earth orrails. The suggestion included means for auto-matically starting and stopping the generators, ascables might become positive or negative to therails. The motor generators would, so to speak,pump the current out of the cables and force itInto the rails whenever the potential of the formershould rise above zero. Fig. 4 illustrates thissuggestion. This plan has not
. Electric railway gazette . to be operated bythe railway power current: the secondary cur-rent developed by these generators to be utilizedto lower the potential In the cables and pipes tozero, with respect to the surrounding earth orrails. The suggestion included means for auto-matically starting and stopping the generators, ascables might become positive or negative to therails. The motor generators would, so to speak,pump the current out of the cables and force itInto the rails whenever the potential of the formershould rise above zero. Fig. 4 illustrates thissuggestion. This plan has not yet been put intooperation .so far as I am aware. Fourth: Insulating the cables and pipes fromthe earth was proposed. As some of the worstoases of corrosion of cables by electrolysis oc-curred where they were painted with asphalt,taped, painted again, and finally covered againwith a heavy braiding also saturated with asphalt,it was apparent that to insulate cables sufficientlyto protect them would be difficult and FIG 4. if Indeed practically possible. To protect waterand gas pipes by a suflicient insulating jacket wasseen at once to be impracticable. Fifth; Breaking the metallic continuity of thecable sheath and pipes was proposed. From thefact that severe action is frequently found incomparatively isolated spots, where cables andpipes cross each other or pass near or across therails, It follows that any system of breaking themetallic continuity, would have to be studiedwith reference to the entire complicated systemof pipes, cables and rails ramifying through thestreets of a city. There would also be a differenceof potential between the several sections of cableor pipe, severed metallically, tending to causeelectrolysis at one end of each section, as Illus-trated in Fig. 5. In case of water pipes, treatedin this manner, the action might be expected onthe interior as well as on the exterior. 182 STREET RAILWAY GAZETTE. April 31, 1894. There appears to be some evide
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