492 ENGINEERING ON THE FARM 



wheel (Fig. 381) is a slow-moving wheel which utilizes a low 

 head and a large volume of water. 



To determine the availability of water for power purposes 

 it is necessary to know: a suitable site for a dam, maximum 

 fall, and second-feet of water flowing at the driest period 

 of the year. The power available will be the cubic feet of 

 water per minute X 62 ^"X the number of feet of available 

 fall, divided by 33,000. The efficiency of a water motor is 

 about 75 per cent. There are many sections where a small 

 water installation can be secured to develop from 5 to 25 

 horse power. First cost is large, but it is a very reliable and 

 satisfactory source of power. When somewhat removed 

 from the place at which the power is to be used, it can be 

 converted into electrical energy by the use of a generator 

 and conducted to the desired location. 



BIBLIOGRAPHY 



Potter, Andrey A. Farm Motors: Steam and Gas Engines, Hydraulic 



and Electric Motors, Windmills. McGraw-Hill. 

 Ramsower, Harry C. Equipment for the Farm and the Farmstead. 



Ginn & Co. 

 "Shall I Buy a Tractor?" Special Bulletin 31, Agricultural Extension 



Division, University of Minnesota, University Farm, St. Paul. 



GOVERNMENT publication 

 "Influence of the Tractor on the Use of Horses," Farmers' Bulletin 1093. 



