392 



ELEMENTS OF AGRICULTURE 



and has some other advantages. Air is pumped into an air- 

 tight iron tank. Water is then forced in. The air-pressure 

 will force all the water out. Some of the air is dissolved 



FIG. 197. Well-planted farm-yard. Trees at the sides, flowers in the corners 

 and about the house, open lawn. Contrast with Fig. 196 



in the water, so that more has to be pumped in occasionally 

 to maintain the pressure. A reinforced concrete cistern is 

 sometimes used instead of a tank. In either case, the water 

 may be pumped by hand, by a windmill, or by an engine. 

 The obstacle that usually deters farmers from installing 

 a water system is the supposed difficulty of disposing of 

 the drainage water. This is usually not a difficult problem. 

 The bathroom fixtures and plumbing should ordinarily 

 be installed by a plumber. All the outside work may be 

 done with farm labor. The drain -pipe should extend 



