. The railroad and engineering journal . alternately cover and uncover the two valve and valve-seat are inclosed in a sort of box, //,made of cast-iron, called a stramcliest, into which steam is ad-mitted from the boiler by a pipe,/. When the valve is in theposition represented in fig. A, the front steam-port c is un-covered, and the steam is admitted to the front end of thecylinder, as indicated by the darts c and c , and it thus forcestle piston toward the back end, or in the direction of the dartA. If, when the piston reaches the back end, as shown in ,, the valve has b
. The railroad and engineering journal . alternately cover and uncover the two valve and valve-seat are inclosed in a sort of box, //,made of cast-iron, called a stramcliest, into which steam is ad-mitted from the boiler by a pipe,/. When the valve is in theposition represented in fig. A, the front steam-port c is un-covered, and the steam is admitted to the front end of thecylinder, as indicated by the darts c and c , and it thus forcestle piston toward the back end, or in the direction of the dartA. If, when the piston reaches the back end, as shown in ,, the valve has been moved into the position shown, theback steam-port d will be uncovered,and steam will be admittedto the back end of the cylinder, as indicated by the darts r/and (/.At the same time it will be observed that the front steam-port<■ and the exhaust-port v are both covered by the cavity H inthe slide-valve, so that the steam which was admitted to thefront end of the cylinder can now escape as indicated by the Fig. 12 Fig. 13 Fig. 14. cylinder by a rod, /i, which is called the piston-rod, whichworks air-tight through an opening in ontoilhe cylinder-covers,or cylinder-heads, as they are usually called. Question 65. How is this reciprocating motion of the pistonconverted into rotary motion ? Answer. By connecting the end of the piston-rod R (fig. APlate I) by another rod, E, called a connecting-rod, with acrank, /, which is attached 10 a revolving shaft, S. It isapparent that if the piston B is moved in the direction shownby the dart R. a rotary motion will be given to the crank inthe direction of the dart n. When, however, the crankreaches the position shown by the dotted lines at N, it is plainthat a force applied to move the piston in either direction will *In all ordinary locomotives, the cylinders are so placed that the head Cthrough which the piston-rod works is behind, and the other head D infront. The two ends of the cylinder are therefore designated the /rotttand hack
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
