WORK BY RUNNING WATER 169 



from pipes against curved paddles, or blades, on the wheel. 

 The angle of the streams and the curvature of the blades are 

 carefully adjusted to secure the greatest possible power. 



Turbine wheels can be built to suit a wide range of con- 

 ditions with respect to pressure and volume of water. When 

 properly constructed and adjusted they will give more power 

 under given conditions than either of the other types of wheels. 

 For these reasons they are now more commonly employed than 

 either of the other types. 



Most large modern water-power plants, as those at Niagara 

 Falls and Keokuk, are equipped with turbine motors. These 

 are used to operate dynamos, and the electric current generated 

 is transmitted to the points where power is needed. 



