CHAP. VIL] VARIOUS TYPES OF STEAM-ENGINES. 



429 



times inclined cylinders are employed ; the reasons for preferring 

 one or other of such arrangements, which involve nothing essential, 

 have relation either to the construction and general working of the 

 parts of the engine, or, in fixed engines, to questions of the horizontal 

 or vertical space available. 



FIG. 302. Oscillating steam-engine. 



In trunk-engines, the piston-rod is suppressed, and the connecting- 

 rod is directly jointed to the piston itself. The oscillating motion of 

 this rod takes place in a cylindrical sheath or collar, which passes 



