. The railroad and engineering journal . 86 THE RAILROAD AND [Ftbruary, 1891. ing-rod causes the latter to exert an upnrard or a downward pres-sure on the end of the pislon-rod. and if it was not supported Insome way this pressure would spring the rod and cause it todiverge more or less from a straight line while it is has been explained, a sliding blork, or cross-head, isattached to (he end of the piston-rod, to cause the latter to movein a straight line. The cross head has beatings which slide onbars, caUed ^:ii,/e-i,irs, fastened to the engine frame or cylin-. of cast iron, althou
. The railroad and engineering journal . 86 THE RAILROAD AND [Ftbruary, 1891. ing-rod causes the latter to exert an upnrard or a downward pres-sure on the end of the pislon-rod. and if it was not supported Insome way this pressure would spring the rod and cause it todiverge more or less from a straight line while it is has been explained, a sliding blork, or cross-head, isattached to (he end of the piston-rod, to cause the latter to movein a straight line. The cross head has beatings which slide onbars, caUed ^:ii,/e-i,irs, fastened to the engine frame or cylin-. of cast iron, although in some classes of engines they are oftenmade of wrought iron or steel. Fig. 217 is a side view lookingat the guide-bar from the inside of the engine ; fig. 21S is atransverse section, and shows the form of Ihe casting, and is a plan. The student should draw this half size. It isboiled to the engine frame by (he four bolts which are slides work on the top .-/ and bottom £ of the bar, whichis planed and filed so as to be perfectly straight. In drawingthe guide-bar, a horizontal line, CD,should first be laid down, representingthe top of the frame. The distancefrom the top of the frame to the cen-ter-line of the cylinder should be as-certained, and the line £ F these two lines various dimen-sions may be laid off. A vertical cen-ter-line, G //, should also be drawn,as shown in the engraving, from whichother dimensions can be method of doing this will be ob-vious from the engravings. N der, so as to be exactly parallel to i
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
