368 



IRRIGATION FARMING. 



the immovable arms and exposes its 24 square feet of 

 surface to the impa<5l of the wind. Half the fans are 

 thus continually in the wind and half out of it. Such a 

 mill, well made, might be an engine of strength, but 

 ciaref ul work and well-considered plans are necessary 



FK;. 79 — THK MERRY-(;0-ROUND. 



to avoid resistance and loss of power. This is proba- 

 bly the cheapest and most efficient mill for its weight 

 that can be built. This mill costs $4.75, exclusive of 

 home labor, pumps an 8-inch stream, and irrigates 10 

 acres. The mill shown in Fig. 79 is a more elaborate 

 mechanism, as it is 40 feet in diameter and 12 to 14 

 feet high. It runs on a circular steel-rail track, and is 

 conne(5led by cog-wheels to a tumbling shaft, which 

 drives the pumping machinery. 



