STATIONARY ENGINES.

283

engine. The piston rod passes through both ends of the cylinder,and is guided with crossheads and slipper guides, as already ex-

o c» r.o cf o

plained. The diameter of the piston rod is greater than that forthe steam cylinder, which tends to carry up the piston. Some

Fig. 190.—Steam Cylinder.

Cylinder. b, Piston, c C, Covers, d, Valve . e, Valve ehest, f, Brackets for bolting down to frame.