. Railroad construction. Theory and practice . ON. §247 down. Until the teeth are down the spikes cannot be drivenhome, and this apparently cheap and easy process results in loosespikes and rails. If the trackmen neglect even temporarily totighten these spikes, it will become impossible to make themtight ultimately. The plates are generally pounded into placewith a 10- to 16-pound sledge-hammer. A very good methodwas adopted once during the construction of a bridge when apile-driver was at hand. The bridge-ties were placed under thepile-hammer. The plates, accurately set to gauge, w^ere thenfo
. Railroad construction. Theory and practice . ON. §247 down. Until the teeth are down the spikes cannot be drivenhome, and this apparently cheap and easy process results in loosespikes and rails. If the trackmen neglect even temporarily totighten these spikes, it will become impossible to make themtight ultimately. The plates are generally pounded into placewith a 10- to 16-pound sledge-hammer. A very good methodwas adopted once during the construction of a bridge when apile-driver was at hand. The bridge-ties were placed under thepile-hammer. The plates, accurately set to gauge, w^ere thenforced in by a blow from the 3000-lb. hammer falling 2 or 3 feet SPIKES. 247. Requirements. The rails must be held to the ties by afastening which will not only give sufficient resistance, but which■will retain its capacity for resistance. It must also be cheapand easily applied. The ordinary track-spike fulfills the lastrequirements, but has comparatively small resisting power, com-pared with screws or bolts. Worse than all, the tendency to. ;^ Fig. 122.
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