. The street railway review . FIG. 6. are such exfoliations to be seen. The effect of the atmos-phere on cast and wrought rails is not so different as to be ofmuch moment. I am inclined to think that the effect is pre-vented on the bearing surface of much used railways by thepressure upon them. One phenomenon, in the difference inthe tendency to rust between wrought iron laid down asrails and subject to continual motion by the passage of the car-riages over them and bars of the same material either stand-ing upright or laid down without being used at all, is veryextraordinary. A railway bar of
. The street railway review . FIG. 6. are such exfoliations to be seen. The effect of the atmos-phere on cast and wrought rails is not so different as to be ofmuch moment. I am inclined to think that the effect is pre-vented on the bearing surface of much used railways by thepressure upon them. One phenomenon, in the difference inthe tendency to rust between wrought iron laid down asrails and subject to continual motion by the passage of the car-riages over them and bars of the same material either stand-ing upright or laid down without being used at all, is veryextraordinary. A railway bar of wrought iron laid care-lessly upon the ground alongside of one in the railway inuse shows the effect of rusting in a very distinct former will be continually throwing off scales of oxi-dated iron, while the latter is scarcely at all affected. In a description of the Liverpool & Manchester Railway,. FIG. 7. l)uilt by Stephenson, Ihe following parliculars nre rails, which were 15 ft. in length and weighed 35 yard, rested upon blocks of stone embedded in the roadbed and placed 3 ft. apart. Each block contained four feetof stone, and into each block were drilled two holes 6 in. deepand I in. in diameter, and into these were driven oak plugs,and the cast iron shoes, to which the rails were immediatelyfastened, were firmly spiked down to the oak plugs, form-ing, as the accoimt reads, a construction of great solidityand strength. The sectional form of the rail is represented in Fig. z. Alateral projection was rolled upon one side of the base of therail and on one side of the cheek of the chair a cavity iscast e(|ual in size with this projection. On the opposite sideof the chair another cavity is cast for the ])urpose of receiv-ing an iron key. When the rail is laid into the , (be 374 ^feectS^oikajrS^B^^ key is driven into the cavity, thus effectually securing t
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
