. American engineer and railroad journal . -&* FIG 4. FIG. 5. and the lap circle with the steam lap as a radius and find theintersection occurs at V, both with the circles and the prev-iously laid down admission line OS and the cut-off point at theintersections at n. On the line OH set off the width of thesteam port from L toward H equal to Lm and with Om asradius draw the arc KmK. The shaded figure enclosed by theletters VKKnL represents the steam port opening during theadmission period and the width of the port opening at anydesired position of the crank is found by measuring the dis-tance r
. American engineer and railroad journal . -&* FIG 4. FIG. 5. and the lap circle with the steam lap as a radius and find theintersection occurs at V, both with the circles and the prev-iously laid down admission line OS and the cut-off point at theintersections at n. On the line OH set off the width of thesteam port from L toward H equal to Lm and with Om asradius draw the arc KmK. The shaded figure enclosed by theletters VKKnL represents the steam port opening during theadmission period and the width of the port opening at anydesired position of the crank is found by measuring the dis-tance radially from O between the lap and valve circles onthe port line, as the case may be, on the desired crank posi-tion. The exhaust openings are determined in the same mannerand are shown on opposite side of FG, where the crankpasses through the arc DJE during the exhaust period witha positive exhaust lap of the size EF. When the exhaust edgeof the valve is line and line this arc becomes GJF or 180degs., and when a negative lap (clearan
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
