. Railroad construction. Theory and practice . at all to the small gap required for gap causes a drop equal to the versed sine of the arc havinga chord equal to the gap and a radius equal to the radius ofthe wheel. Taking the extreme case (for a 30-foot rail) of a fgap and a 33 freight-car wheel, the drop is about xoVo- ^^order to test how much the jarring at a joint is due to a gap be-tween the rails, the experiment was tried of cutting shallownotches in the top of an otherwise solid rail and running a loco-motive and an inspection car over them. The resulting jarringwas practi
. Railroad construction. Theory and practice . at all to the small gap required for gap causes a drop equal to the versed sine of the arc havinga chord equal to the gap and a radius equal to the radius ofthe wheel. Taking the extreme case (for a 30-foot rail) of a fgap and a 33 freight-car wheel, the drop is about xoVo- ^^order to test how much the jarring at a joint is due to a gap be-tween the rails, the experiment was tried of cutting shallownotches in the top of an otherwise solid rail and running a loco-motive and an inspection car over them. The resulting jarringwas practically imperceptible and not comparable to the jar pro-duced at joints. Notwithstanding this fact, many plans have * Roadniasters Association of America—Reports for 1897. § 240. RAIL-FASTENIKGS. 261 been tried for avoiding this gap. The most of these plans con-sist essentially of some form of compound rail, the sectionsbreaking joints. (Of comse the design of the compound railhas also several other objects in view.) In Fig. 117 are shown a.
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