. Railway mechanical engineer . n the quality of thesteel, four similar springs were selected, each varying from theothers either as to the place of manufacture or the source ofthe material used. These springs were applied to four Consoli-dation type freight locomotives of the same class, being locatedin each instance over the left Xo. 2 driver. After a few monthsservice, during which a record of the mileage was kept, thesprings were removed and tested in the usual manner. The testcurves are shown in Fig. 12. Spring A was built in a railwayshop, the plates being painted with oil and graphite w
. Railway mechanical engineer . n the quality of thesteel, four similar springs were selected, each varying from theothers either as to the place of manufacture or the source ofthe material used. These springs were applied to four Consoli-dation type freight locomotives of the same class, being locatedin each instance over the left Xo. 2 driver. After a few monthsservice, during which a record of the mileage was kept, thesprings were removed and tested in the usual manner. The testcurves are shown in Fig. 12. Spring A was built in a railwayshop, the plates being painted with oil and graphite when as- sembled. Spring C was built in the same shop and assembledin the same manner but from steel rolled in a different B was built in a contract shop of the same materialused in spring .i. .\lthough no data is available on this pointit is assumed from a comparison of the curves taken when thesprings were new that no lubricant was used bctwen the platesof spring B. Spring D differs both in the point of manufacture. Fig. 13 and the source of material from all three of the springs (>re-\ iously mentioned. It will be observed that the release load heights taken liothbefore and after the springs had been in service approximateeach other very closely. In contrast to the relative uniformityof these curves the heights for the applied loads differ consider-ably due to the stiffening effect of increased friction between theplates. It may therefore be concluded that variations in work-manship and differences in the source of material will have prac-
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
