FARM MOTORS 



FIG. 2OQ. SECTIONAL WHEEL WITH NO RUDDER 



front of the wheel there is a loss of efficiency of about 

 14 per cent ; with it behind the wheel there is a loss of only 

 about 7 per cent. 



427. Regulation. Wind wheels of this country are 

 made to regulate themselves automatically, and by this 

 means of regulation they do not. attain a very high rate 

 of speed, nearly all of them cutting themselves out when 

 the wind has reached a velocity of about 25 miles an hour. 

 This is principally due to the fact that our mills are gen- 

 erally made for pumping purposes and the pumps do not 

 work well when the number of strokes becomes too great. 

 It is for this reason that the direct-connected wooden 

 wheels do not give as much power as the back-geared 

 steel wheels. As a result of the wind wheels being 



