502 



Index 



Windmills, conditions for highest ser- 

 vice, 318; for lifting water, 312, 316, 

 318, 367; capacity for irrigation, 318; 

 use in drainage, 463. 



Wind power, for irrigation, 312; work 

 done by months, 315; work done by 

 10-day periods, 316. 



Wolff, A. R., 318. * 



