508 



Farm Mechanics. 



account more or less of water tends to condense in the 

 cylinder which, like the rest, must be removed by re- 

 evaporation. 



It should be clear from this and the preceding para- 

 graphs that the cylinder should be well jacketed so as 

 to reduce as far as possible all tendency to condense the 

 steam in the cylinder before it escapes through the ex- 

 haust. 



635. Engine Boilers. The boilers of farm engines are 

 commonly one or the other of two types, horizontal or up- 

 right, represented in Figs. 243 and 244. The horizontal 

 boilers are best adapted to the engines of the larger sizes 

 and are as a rule the most economical forms ; but where 

 a small engine is desired, and especially one which is 

 compact and which occupies but little space, then the up- 

 right types may be used, such as represented in Fig. 244. 



FIG. 244. Vertical boiler and engine. 



