

WATER-POWER AND STEAM-POWER 



73 



water enters a cylinder in streams that strike the blades 

 of a revolving shaft hi such a way that nearly all the 

 power of the falling water is utilized in spinning the shaft 

 (see Figs. 31 and 32). By this means only about twenty- 



FIG. 32. The machinery of the turbine. 



five per cent of the theoretical energy is lost, which is much 

 less than the amount lost in the use of the older types of 

 water-wheels. Turbines are also used in generating power 

 by means of steam-pressure. Many modern steamships use 

 turbine motors. 

 It has been estimated that the rivers of the United 



