. Railway master mechanic [microform] . £ the subject of a report made by the committee oniron and steel structures of the A. R. E. and M. at their last annual meeting. (See reportof Mr. A. J. Himes, p. 297 of the proceedings.) Thematter is now in the hands of a joint committee of theA I. C. B. and M. of W. Associations. I wish to acknowledge here my indebtedness to report for some of the facts presented in thispaper. When the rule for the length of flat spots was adoptedin 1878, the maximum freight car capacity was 40,000lbs. and the weight of car 22,000 lbs., m
. Railway master mechanic [microform] . £ the subject of a report made by the committee oniron and steel structures of the A. R. E. and M. at their last annual meeting. (See reportof Mr. A. J. Himes, p. 297 of the proceedings.) Thematter is now in the hands of a joint committee of theA I. C. B. and M. of W. Associations. I wish to acknowledge here my indebtedness to report for some of the facts presented in thispaper. When the rule for the length of flat spots was adoptedin 1878, the maximum freight car capacity was 40,000lbs. and the weight of car 22,000 lbs., making a totalweight on the wheels of 62,000 lbs. Today the 100,000-lb. car when loaded to its maximum capacity will weigh *By Prof. Chas. H. Benjamin before the Western RailwayClub. January, 1909 RAILWAY MASTER MECHANIC 19. FIG. 1—FLAT SPOTS ON CAR WHEELS. nearly if not quite 150,000 lbs. The speed has evenmore influence than the weight since the energy of im-pact will vary directly as the weight and as the squareof the velocity. Probably the average speed of freighttrains has doubled in the last thirty years. It is, ofcourse, true that the weight of rails has greatly increasedin the same time. Although the new rail may be twiceas strong as the old to resist bending between the ties,it does not follow that its capacity for resisting blowsis increased in the same ratio. The damage done bythe hammer blow of the flat wheel is liable to be of alocal nature and may not be averted by the great depthand weight of rail. The violence of the blow is alsoincreased by rigidity of the rail and its supporting tiesand ballast. This is particularly true at high speeds. Professor E. L. Hancock, of Purdue University, ina paper read before the Indiana Engineering Society attheir meeting in January, 1908, developed a math
Size: 1842px × 1357px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1895
