. Railroad construction. Theory and practice . reversal of the stresses would cause the bars I Fig. 118.—Effect of Wheel Drop (Exaggerated). to give way with a less stress than if the stress were always thesame in kind. A supported joint, and especially a three-tiejoint (see § 240), is apt to be broken in the same manner. 242. Standard angle-bars. An angle-bar must be so madeas to closely fit the rails. The great multiplicity in the designsof rails (referred to in Chapter IX) results in nearly as greatvariety in the detailed dimensions of the angle-bars. The sec-tions here illustrated must be
. Railroad construction. Theory and practice . reversal of the stresses would cause the bars I Fig. 118.—Effect of Wheel Drop (Exaggerated). to give way with a less stress than if the stress were always thesame in kind. A supported joint, and especially a three-tiejoint (see § 240), is apt to be broken in the same manner. 242. Standard angle-bars. An angle-bar must be so madeas to closely fit the rails. The great multiplicity in the designsof rails (referred to in Chapter IX) results in nearly as greatvariety in the detailed dimensions of the angle-bars. The sec-tions here illustrated must be considered only as types of thevariable forms necessary for each different shape of rail. The §243. RAIL-FASTENINGS; 253 absolutely essential features required for a fit are (1) the anglesof the upper and lower surfaces of the bar where they fit againstthe rail, and (2) the height of the bar. The bolt-holes in thebar and rail must also correspond. The holes in the angle-platesare elongated or made oval, so that the track-bolts, which are. ^^ i (^^%^J^s—gl :l_@ 6^^-© 9^^ ®-^
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