518 



Farm 3lecJianics. 



650. The Engine Most farm- engines are mounted upon 

 their boilers as represented in Fig. 244, at the left, and 

 in Figs. 249 and 250. Its chief parts are the cylinder, 5 ; 

 the steam, chest with sliding valve, 4; the fly-wheel, 2; 

 the eccentric ; the governor, 6 ; and the throttle valve, 7. 



The construction of the cylinder of the compound en- 

 gine is shown in Fig. 252, where A is the high pressure cyl- 

 inder, B the low pressure cylinder and 1, 1, 1, 1, 1, 1, 1, 1, 

 the sliding valve which regulates the entrance and exit of 



FIG. 249. Portable steam engine. 



the steam. As the steam from the boiler comes to the steam 

 chest at E it first enters the compartment D of the slide 

 valve by a port not shown in the section and from there is 

 conveyed into the cylinder A along the passage O where it 

 forces the piston toward G. While this is being done the 

 steam on the other side of the piston at A, which has 

 spent only a part of its energy, passes out through the 

 passage 2,2, into the steam chest C from which it enters 

 the large cylinder B on the side of the piston at 3 and 



