. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools . Fig. 178. - \ \ \ Fig. 179. will stand at the same angle (a) with the track, as shown inFig. 177. But it has been noticed that for ordinary degrees ofcurvature, the rear wheels stand radial to the curve (see ), and for steam railroad work this is the normal case. Whenthe two parallel axles are on a curve (as shown), the wheels tendto run in a straight line. In order that they shall run on a curvethey must slip laterally. The principleis illustrated in an exaggerated form
. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools . Fig. 178. - \ \ \ Fig. 179. will stand at the same angle (a) with the track, as shown inFig. 177. But it has been noticed that for ordinary degrees ofcurvature, the rear wheels stand radial to the curve (see ), and for steam railroad work this is the normal case. Whenthe two parallel axles are on a curve (as shown), the wheels tendto run in a straight line. In order that they shall run on a curvethey must slip laterally. The principleis illustrated in an exaggerated form inFig. 179. The wheel tends to roll from a jtoward h. Therefore in passing along thetrack from a to c it must actually slip late-rally an amount he which equals ae sin ^=length of the wheel-base (Figs. 177 and 178); r=radiusof curve; then for the first case (Fig. 177), sin a = t-r-2r; forthe second and usual case (Fig. 178), sin a = ^^r; ior t = 5 feetand r = radius of a 1° curve, a = 0°03 for the second case, avaries (practically) as the degree of curve. The lateral slippingper unit of distance travele
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1913
