. The Street railway journal . cently equipped withelectric power, and a general map of the system is given onthis page. As will be seen, the street railway connects thecenter of the city, which is on an island formed by twobranches of the River Lee, through the principal streets,with suburbs. The longest branch is to Douglas, a villageabout 2 miles south of Cork. The tramway crosses theriver twice, once over Parnell Bridge, a steel swing bridge,second over Patricks Bridge, built of stone. The rails in the city are laid on a bed of concrete, andthe roadway is pavCd between the rails and for a
. The Street railway journal . cently equipped withelectric power, and a general map of the system is given onthis page. As will be seen, the street railway connects thecenter of the city, which is on an island formed by twobranches of the River Lee, through the principal streets,with suburbs. The longest branch is to Douglas, a villageabout 2 miles south of Cork. The tramway crosses theriver twice, once over Parnell Bridge, a steel swing bridge,second over Patricks Bridge, built of stone. The rails in the city are laid on a bed of concrete, andthe roadway is pavCd between the rails and for a distanceof 18 ins. on each side. Outside of the city boundaries theconcrete is replaced by creosoted ties, 6 ft. x 4^ ins. x 9 rails are of girder type, weighing 83 lbs. per yard, withfish-plates 26 ins. long, weighing 56 lbs. per pair. The tie-bars are of wrought iron, 2 ins. x f in., weighing io§ lbs.,and double screwed at ends. The rails are fixed to the tiesby thirty dog spikes and fourteen fang bolts and chips to. Tivoli MAP OF CORK TRAMWAYS foot of copper we have, as the total resistance of the con-ductor, P V dist. in ft. volts drop R — = cm. in conductor amps, flowing drop X cm. 7°X distance = = drop X cir. mils per amp. amps. Values thus obtained are platted in scale B. If at anypoint two of the terms involved are known the third maybe determined by substitution. If it be desired to find the current delivered with a speci-fied drop a special scale is more convenient than the generalone, B. Scale C gives the number of amperes deliveredwith a drop of 50 volts by each 1,000,000 cm. As before, P x distance R = . cm. or i\ drop 50 v 1,000,000 Amps. = = R PX distance. To find the current delivered by M cm., the values ofscale C are multiplied by M 1,000,000 each rail length. The switches and frogs are cast steel,made by Millar & Co., and Dick, Kerr & Co., Ltd. The rails form the return circuit, and are electrically con-nected at each joint by two No. 000 B. & S.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
