CHAP. VIL] VARIOUS TYPES OF STEAM-ENGINES. 



427 



them, are suppressed. There is nothing but the feed-pump. But 

 we have purposely taken for our type the most complicated 

 steam-engine, so as not to forget anything that is essential for 

 the explanation of the machinery employed in the different types. 



IT. STEAM-ENGINES WITH DIRECT MOTION. 



The transmission of the motion in the beam-engine is made 

 indirectly, since the motion becomes alternating and circular before 

 it becomes continuous. 



FIG. 300. Vertical steam-engine. 



A. Steam-pipe. C. Cylinder. BZ. Slide-valve and valve-chest, GKH. Slide. EFJO. Connecting- 

 rod, crank and shaft. VV. Fly-wheel. PO. Feed-pipe. D. Blast-pipe. 



Many methods have been invented for the direct transmission of 

 the motion of the piston to the shaft ; whence the engines known 

 as vertical, horizontal, and oscillating. We will explain a type of 

 each of these kinds of engine. 



