HEALTH AND WELL-BEING 



55 



matter may be destroyed by a sufficient supply of oxygen 

 dissolved in the water. This aeration is very satisfactorily 

 accomplished by use of a pump that carries water up on one 

 side of an endless chain in a series of small metal cups 



FIG. 23. An air-pressure water system and plumbing for a house where 

 there is no city water supply. The pumping may be done by hand, by a gaso- 

 line engine, or by a windmill. 



attached to the chain. This chain runs over two wheels, 

 one at the surface and one held suspended down in the water 

 near the bottom of the cistern. As these cups are inverted 

 when they pass down into the water, air is taken down and 



