WINDMII.I.S AND PUMPS. 367 



ings, or it may be of wood, but with metal ends or 

 bearings. It may be gas-pipe shafting, or, as is not 

 uncommon, the axis of a buggy or wagon. This is the 

 fundamental part, and to it are attached the four, also 

 six, eight, or many fans, as the case may be. The 

 Jumbo itself cannot exceed the Battle- Ax in simplicity, 

 cheapness, or power, but the Battle-Ax is presumably 

 the superior in all respedls. These mills are simple, 

 cheap, of easy construc5lion, and are quite efficient. In 

 size they run from 8 to 10 feet, the more common sizes, 

 up to more powerful mills, 16 feet in diameter. 



The Merry- Go-Round.— The Merry-Go-Round 

 is a realization of an attempt to devise home-made mills 

 of unlimited size and strength. The larger ones are of 

 rare occurrence, but are seen in several parts of the 

 far west. The smaller ones are mounted on towers, 

 the larger ones on the ground, as shown in Fig. 79. 

 The former are the more common and look like ele- 

 vated water-tanks, for which they are often mistaken. 

 The fans revolve around a vertical axis, and surround- 

 ing all is a series of movable shutters, which come to- 

 gether and form a sort of closed cylinder when the 

 mill is out of gear. When in adlion they are partly 

 opened, admitting air to the fan on one side and ex- 

 cluding it from the other. 



We have in mind one Merry-Go-Round which is 24 

 feet in diameter, and carries numerous swinging door- 

 like fans of light wood, 6 feet high by 4 feet wide. 

 The fans are free at one edge, and, like a flag floating 

 from the mast, they swing edgewise against the wind, 

 this being the line of least resistance. The moment 

 the center is past each fan in turn swings back against 



