254 



from 2|in. to 5^in., and cost complete from 3 to ^5. When 

 there is the slightest suspicion of alkali in the water, care should be 

 taken to have a brass-lined pump, brass not being subject to 

 corrosion. Where running water is available as a motive power, 

 rams may be used for elevating the water to a moderate height. 

 These are comparatively inexpensive appliances, and are always 

 at work so long as the water runs, but only a fraction of the water 

 that passes through them is elevated. 



CAPACITIES OF WINDMILLS AND RESERVOIRS. 



Extra reservoir required t< re-serve overflow after 24 hours pumping should be 

 of one and two-acre sixes, holding from <S to lo-acre feet of water. 



Large reservoirs of OIK- and two-acre si/ >. s feet deep, banks 9 feet high, 

 base, 45 feet. A square acre is joi; feet on each side. A two-acre reservoir would 

 be 209 x 418 feet. 



