142 SCIENCE OF THRESHING. 



resistance, if the engine be started suddenly, throws 

 a severe strain on the brasses and connections, and 

 may even fracture the cylinder head. 



After the cylinder has been heated up at one end, 

 the reverse lever should be thrown over to admit 

 steam to the other end. If the engine is a compound, 

 the reverse lever should be thrown back and forth a 

 few times to warm up the low pressure cylinder. 

 After the cylinder has been properly heated, which is 

 indicated by steam instead of water issuing from the 

 cylinder cock, the throttle may be opened enough to 

 cause the engine to start slowly. After it has run 

 slowly for a little time, the throttle should be opened 

 enough to run it at full speed. 



THE ENGINE ON THE ROAD. 



While traveling on the road, the water should be 

 carried as high as practical in the glass to insure the 

 covering of the fire-box and the flues, while the engine 

 is passing over any irregularities on the road. Before 

 starting to ascend long or steep hills, fresh fuel 

 should be added to the fire in time for it to become 

 thoroughly ignited before the steep portion of the 

 hill is reached. Fresh fuel deadens the fire and 

 absorbs the heat of the live coals, thus momentarily 

 checking the generating of steam. If the hill to be 

 ascended is a long or steep one, and the engine has 

 a heavy load to draw, the speed of the engine should 

 be regulated to run only fast enough to use the 

 steam as generated. If the engine is permitted to 

 run too fast when loaded, the steam pressure will be 



