Fig. 3378.
[Fig. 3378] represents the arrangement of the valves in a Corliss engine, v and v1 being the steam valves and v2 and v3 the exhaust valves. These valves, it will be seen, extend crossways of the cylinder and are circular. In the figure the valves are shown in the position they would occupy when the piston was at the crank end of the cylinder, as in the figure.
The principles of a Corliss valve gear will be understood from the following, which is derived from a book by the author of this work, and entitled Modern Steam Engines.
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Fig. 3379.