. Railroad construction. Theory and practice . ^ of the improved de-signs of rail-joints. The varia-tions are chiefly a general in-crease in size to correspond withthe increased weight of rails,besides variations in detail di-mensions which are frequentlyunimportant. The diameter isusually f to Y; l bolts aresometimes used for the heaviestsections of rails. As to length, the bolt should not extend moreFig. ^^^^ ^„ ^^^^.^^ ^^ ^^^ ^^^ ^^.j^^^ it is screT>^ed up. If it extends farther than this it is liable to be. § 253. RAIL-FASTENINGS. 263 broken off by a possible derailmen
. Railroad construction. Theory and practice . ^ of the improved de-signs of rail-joints. The varia-tions are chiefly a general in-crease in size to correspond withthe increased weight of rails,besides variations in detail di-mensions which are frequentlyunimportant. The diameter isusually f to Y; l bolts aresometimes used for the heaviestsections of rails. As to length, the bolt should not extend moreFig. ^^^^ ^„ ^^^^.^^ ^^ ^^^ ^^^ ^^.j^^^ it is screT>^ed up. If it extends farther than this it is liable to be. § 253. RAIL-FASTENINGS. 263 broken off by a possible derailment at that point. The lengthsused vary from 3|, which may be used with 60-lb. rails, to 5,which is required with 100-lb. rails. The length required de-pends somewhat on the type of nut-lock used. 253. Design of nut-locks. The designs for nut-locks may bedivided into three classes: (a) those depending entirely on anelastic washer which absorbs the vibration which might other-wise induce turning; (h) those which jam the threads of thebolt and nut so that, when screwed up, the frictional resistanceis too great to be overcome by vibration; (c) the positive*nut-locks—those which mechanically hold the nut from of the designs combine these principles to some ^vulcanized fiber nut-lock is an example of the first consists essentially of a rubber washer which is protected byan iron ring. When first placed this lock is effective, but therubber soon hardens and loses its elasticity and it is then inef
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Keywords: ., bookauthorwebbwalt, bookcentury1900, bookdecade1900, bookyear1903
