150 



HYDR KINETICS. 



261. The Overshot Wheel. In the overshot 

 wheel the water falls into buckets at the top, and by its 



weight, aided by the 

 force of the current, 

 turns the wheel. As 

 the buckets are gra- 

 dually inverted, the 

 water is emptied, 

 and the load thus 

 removed from the 

 other side of the 

 wheel. Such wheels 

 it require but little 

 FIG. 88. water but a great 



fall. It is said that 



they have been made nearly 100 feet in diameter. The 

 water is led to the top of the wheel by a sluice, GH. 



262. The Breast Wheel. In the breast wheel, 

 the water acts upon 



float boards fixed 

 perpendicular to the 

 circumference. The 

 stream being received 

 at or near the level 

 of the axis, both the 

 weight of the water 

 and the force of the 

 current may be 



turned to account. 



FIG. 



263. The Undershot Wheel. In the under- 

 shot wheel, the stream strikes, near the bottom of the 



