Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 386
and narrow ; the steam-valves openquickly and close at once by a drop; the exhaust-valves move rapidly from thewrist connection. From the great size and form of the common slide-valve thereensues a great pressure on the surface; various expedients have been adoptedto relieve this pressure, which is… … Fig. 844. cylinder and valves. The valves are four in number, one for admission and onefor exhaust, at each end of the cylinder, and on opposite sides. They standvertically to drain the cylinder. The valves work between opposite parallelseats ; the exhaust-valves nearly and the admission-valves…
Mechanical drawing
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