. The street railway review . rrac/rPIG. 25—DKADLEV SYSTEM. Lugano is 7^ miles from the water fall which is the sourceof power and over this distance a three phase alternatingcurrent is transmitted at 5,500 volts and with a frequency of40. The transformer house is centrally located with refer-ence to the lines which have a voltage of 400. From the secondary of the transformer connections are made to thetwo trolley wires, and the rails take the place of a third motors on the cars are single reduction. 24-h. p., 12-polemachines which give a maximum speed ot gy^ miles perhour. The speed i
. The street railway review . rrac/rPIG. 25—DKADLEV SYSTEM. Lugano is 7^ miles from the water fall which is the sourceof power and over this distance a three phase alternatingcurrent is transmitted at 5,500 volts and with a frequency of40. The transformer house is centrally located with refer-ence to the lines which have a voltage of 400. From the secondary of the transformer connections are made to thetwo trolley wires, and the rails take the place of a third motors on the cars are single reduction. 24-h. p., 12-polemachines which give a maximum speed ot gy^ miles perhour. The speed is controlled by resistance in series with. -iiiiiiiiiiiiiiiiiiiiiiiririii—- FIG. 26—DERI SYSTEM. the rotor. At slow speeds and in starting the motors haveto run on the rheostat and are, therefore, not very efficientwhere frequent stops and slow speeds are necessary. Apolyphase system will hardly find application in the cityfor the double trolley would make switches and cross-overs very complicated. However it could be used withsuccess on conduit lines where a double trolley is notobjectionable. It is said that on the Swiss lines the doubletrolley does not cause any great inconvenience. Even inthis country there has been some experience with the doubletrolley and it has been in use for years in Cincinnati. Alternate current apparatus will find application in anyvicinity where there is a cheap and abundant source ofpower whether it be from water falls or steam plants favor-orably situated. The limit of voltage has not been reachedfor with every new transmission line a higher potential issuggested. Whereas a few years ago a p
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
