TRANSACTIONS OF STATE AGRICULTURAL SOCIETY. 95 



face, or within suction limit, vertical and horizontal, rotary and cen- 

 trifugal pumps are used, owing to their great capacity and comparatively 

 small cost; but under the most favorable conditions the best makes of 

 this class of pumps rarely show an efficiency of more than 50 per cent. 

 For all deep work (beyond suction limit), where large quantities of 

 water are wanted from deep wells of small diameter at the minimum 

 cost for power, the double plunger, continuous flow, cylinder pumps are 

 the best; the main reason being their high efficiency, from 75 to 85 per 

 cent, depending on conditions. 



