22 



SCIENCE OF SUCCESSFUL THRESHING 



STEAM. 



soaked in a solution composed of one part of muriatic 

 acid and ten parts of water. Occasionally soak the whole 

 injector. Do not expect an injector to work well, espe- 

 cially at high pressure, if the tank be full of dirt and 

 rubbish. Sometimes an injector will work well for a 



long time, and then begin 

 to drizzle at the overflow 

 under the same pressure at 

 which it once worked well. 

 This indicates that the 

 passage-ways in jets are 

 either worn or are con- 

 tracted with lime. If re- 

 moving the lime does not 

 remedy the trouble, the 

 overflow valve may leak. 

 To regrind it, remove cap 

 "Z" and spread a little 

 flour of emery, mixed with 

 oil or soap, between the 

 valve "P" and its seat. 

 Then with a screw driver, 

 turn valve "P" back and forth, which will grind it to a 

 seat. If the injector be not improved, it is safe to conclude 

 that some of the jets are worn and must be renewed. These 

 are sold separately, and are listed in the thresherman's 

 Supply Catalogs. If in doubt as to which jet is at fault, 



FIG. 4. SECTIONAL VIEW OF 

 INJECTOR. 



