[ "4 ] 



South Africa with such success, seem well adapted for India. 

 Wind-mills of cheap construction are popular in the United 

 States also, whence we get the Chicago aeromotors. A cheap 

 wind-mill is constructed without a vane, and the wheel is so 

 fixed as to he driven only by the prevailing winds during 

 the dry season, which in Lower Bengal are from north and 

 south, or a few points off either way. The sails would catch 

 the wind only when it is about northerly or southerly, and 

 the mill would thus be set in motion. When the wind is 

 easterly or westerly it would not move. It is necessary to 

 enclose the lower part with boards or walls so as to exclude 

 the wind from all sides except from the top, and the aftion 



FIG. 6.- THE HOME-MADE WIND-MILL. 



of the mill should correspond to that of an over-short water- 

 wheel, The figure given here (Fig. 6) illustrates a wind- 



