erticalline. In this case each spindle is solid and has its separate steam-tight collar. The most perfect form of valve is that of Trevithick. The 17 130 DOUBLE-ACTING slide valve, if tight, is attended with great friction, and the puppetvalve is kept in its seat by a pressure of steam, which, on… … form of a cylinder, on the upper end of which, at c c, is a conicalring, and a hollow cone is turned at b b, on its inner and lowersurface. The first of these conical surfaces rests in a hollowfrustum e e, the second upon a solid frustum d d. It will there-fore be seen that the resistance to the…
Steam-engines
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