Wind Power for Irrigation 



313 



The writer* has conducted a series of observations with a 

 16-foot geared Aermotor windmill during one whole year, which 

 shows just how much water was lifted 12.85 feet high each hour 

 of every day under one set of conditions. The amount of the 

 water pumped each and every hour of the day, and the number of 

 miles of wind which passed the mill and did the work, were auto- 

 matically recorded, giving for the first time a complete record for a 

 full year of the amount of work one windmill did in lifting water. 



The mill stands on a steel tower 22 feet above the roof and 

 82 feet above the ground, as represented in Fig. 71, and lifted 

 the water 12.85 feet from a reservoir having an area of 285 

 square feet, into a measuring tank holding 141.2 cubic feet, 

 which, when filled, emptied itself in 45 seconds back into the 

 reservoir. The number of times this measuring tank was filled 

 each hour of the day during ~each month of the year, and the 

 miles of wind which did the work, are given in the table on page 

 315, and the results are shown graphically in Fig. 72. In this 

 table the numbers at the head of the columns are the hours 



*Bulletin 68, Wis. Agr. Exp. Station. 



Fig. 72. Upper curve shows miles of wind each hour of the year. Lower curve 

 shows the number of tanks of water pumped by the same wind. 



