SCIENCE OF THRESHING. 155 



Don't allow the ashes to accumulate under the 

 grates. 



Don't allow the spaces between the grates to 

 become choked with cinders. 



Don't stir the fire enough to cause small particles 

 of unburnt coal to fall through the grates. 



Don't allow vacant spaces on the grates. 



Don't have the fuel spread unevenly on the grates. 



Don't allow mud and scale to accumulate on the 

 heating surface of the boiler. 



Don't neglect to keep the flues clean from soot. 



Don't pump cold water into the boiler too rapidly. 



Don't run with too low water. 



Don't carry water high enough to cause priming 

 or foaming. 



Don't forget to put out your fire if water gets 

 below crown sheet. 



Don't forget to drain pipes in freezing weather. 



Don't forget to open the boiler stopcock before 

 starting the pump. 



Don't fail to keep your water glass tubes and 

 cocks clear and open. 



Don't try to work the pump when the tank is 

 empty. 



Don't run the engine with stuffing box glands too 

 tight. 



Don't fail to replace old burnt and hard packing 

 with new. 



Don't fail to test your piston and valve for leaks. 



Don't run an engine with valve set improperly. 



Don't fail to adjust brasses and journals. 



