l6 SCIENCE OF SUCCESSFUL THRESHING 



that the suction hose and connections are free from leaks. 

 The pipe nipples, which screw into the boiler at the point 

 at which the feed water enters, should be examined oc- 

 casionally, for with some waters they "lime-up" in a 

 remarkably short time. This accumulation of lime is 



shown in the accom- 

 panying cut, which is 

 reproduced from a pipe 

 nipple taken from a 

 FIG. 3. LIME IN FEED traction engine. When 



necessary to shut down 



from lack of water, it should be done while the glass 

 shows at least half an inch, as the water-level will fall 

 that much when the engine is stopped, thereby allowing 

 the water in the boiler to settle. 



What to do when water docs not show in glass. If you 

 find that the water has been allowed to get below the glass 

 gage and lower gage cock, leaving the crown-sheet bare, 

 when the engine has been standing still for a time, bank 

 the fire and leave the engine alone until it cools. If it be 

 working when you discover the water is out of the glass, 

 the thing to do is, get the front end of the engine up at once. 

 Back the traction wheels into ditch or furrow, run the front 

 wheels up hill or onto a wood or coal pile, or use any means 

 to get the front of the boiler high. If in soft ground there 

 may be time to dig holes for the traction wheels, but be 

 quick about it. In the meantime keep the engine moving 



