[ '23 ] 



in each case, the axle of the wheel resting on this brickwork 

 whence the power is transmitted to the various machinery 

 worked in the barn. The diameter of the overshot wheel 



FIG. 9. THE BREAST- 

 WHEEL. 



FIG. io. THE 

 UNDERSHOT WHEEL. 



should be a little less and that of the breast wheel somewhat 

 greater than the height of the fall of the water. 



158. The Turbine (Fig. 1 1.) is a more complicated machine 

 than the ordinary water wheels and not being capable of repair 

 in villages it is not so suited for agricultural requirements, 



FIG. ii. THE TURBINE. 



though it will prove far more useful where it can be introduced. 

 It is not necessary to have a very great fall of water to work a 

 turbine and the wheel occupies very little space. As it can be 



