3 io 



FARM MOTORS 



*This wheel was made up of two concentric circles of sails, the outer having 

 144 sails and the inner 100. 



than others. This is due to workmanship and angle of 

 weather. 



It is very clearly shown that the steel wheel is much 

 more powerful than the wooden. 



Another important factor noticed from the above table 

 is that the i6-foot mill develops only about 50 per cent 

 more power than the 12-foot. Taking the shipping 

 weights of the 12-foot and i6-foot mills with 5O-foot steel 

 towers, it is found that they are about 2,000 pounds and 

 4,200 pounds, respectively, and since a i6-foot mill is 

 much more liable to be damaged by a storm than a 12- 

 foot, it is better in a great many cases to put up two 

 12-foot mills instead of one i6-foot. 



Mr. Murphy made tests of a Little Jumbo mill 7^4 

 feet in diameter with eight sails, each 11X16 feet, and 

 found that in a 2O-mile wind he got 0.082 H.P. and in a 

 25-mile wind he got o.ioo H.P. He also made tests of a 

 Little Giant mill and by computation found that the lat- 

 ter mill, having the same dimensions as the former, would 

 start in a slower wind and when at full speed would 

 develop about 2.5 times as much power. Other advan- 



