MOTIVE POWER 



491 



with water-wheel installation. There are two types of wheels 

 in common use, the Pelton and the turbine. In the Pelton 

 wheel (Fig. 380) the water is directed against vanes or cups 



■Generafor 

 ■Governor 



-X-F/y whee/ 



Fig. 381. Turbine wheel, used on low heads of large volume 



on the periphery of the wheel. It is used on high heads where 

 a small quantity of water is available. The water is usually 

 directed against the wheel through nozzles. The turbine 



