146 SCIENCE OF THRESHING. 



should be somewhat lower than the forward; the 

 engine should never be inclined the other way, as the 

 steam dome is near the forward end of the boiler. 

 The elevation of the front end will give a greater 

 distance from the steam pipe to the water line; this 

 positioning of the engine is perhaps more essential 

 in boilers having little steam space than those having 

 large space. 



