428 THE APPLICATIONS OF PHYSICAL FORCES. [BOOK iv. 



The vertical engine, or engine with vertical cylinder, two views of 

 which are given in Fig. 300, is a high-pressure engine, in which the 

 steam acts by expansion, but without condensation. The explanation 

 of the figure shows what are the various parts the cylinder, the 

 slide-valve, the fly-wheel, the governor, &c. The only point to 

 which we would draw attention is the method of transmitting the 

 motion. 



The piston-rod is directly jointed to the connecting-rod EF, which 

 works upon the crank of the shaft. This rod is guided in its motion 



FIG. 301. Horizontal steam-engine. 



by a cross-head, or horizontal movable bar GG, which moves up and 

 down two vertical guides, which are fixed at K and H, that is to say, 

 at K to the cylinder and at H to the framework of the engine. 



This is, indeed, a mode of transmission, very similar to that of 

 the horizontal engine represented in Fig. 301 ; and we have said 

 enough about it to enable the reader to understand, without any 

 special description, the arrangement of the different parts of the 

 engine. 



In locomotives we shall see that sometimes horizontal and some- 



