40 SCIENCE OF SUCCESSFUL THRESHING. 



G, open the drain and remove cap F to drain the water, then 

 close I and proceed as above. When the engine is shut down, 

 close valve G. 



When Lubricator Fails to Work. If the Lubricator 

 should become clogged from impurities in the oil, remove 

 cap F and glass D, then open valves G and E, and the 

 passages will be cleaned by steam pressure. In blowing 

 remove cap F and glass D, then open valves G and E, and 

 the passages will be cleaned by steam pressure. In blowing 

 live steam through the Lubricator to clean out the passages, 

 always take off the nut D holding the sight feed glass before 

 doing so. for if this be not done, the steam would heat the 

 glass and render it liable to break when the oil comes in con- 

 tact with it. Many cups are ruined by two causes, viz : By 

 freezing and by straining. In cold weather the cups should 

 be drained before leaving the engine. The valve E should 

 be slightly opened, except when filling, for if left closed, the 

 expansion of cold oil having no relief will strain the cup. 



The little bright plate that shows the sight feed drops 

 should be kept clean and bright by an occasional wiping with 

 a little silver polish ; if this be not done, it becomes tarnished 

 and does not show the feed properly. When a glass breaks, 

 if an extra one be not at hand, a coin may be put in and the 

 cup run "blind feed" until a new one is procured. A quarter 

 is the right size for the large lubricator and a five-cent piece 

 for the one on the pump. 



Packing. The nut that holds the sight-feed glass must 



