564 



MACHINES, WORK, AND ENERGY 



available water power is located some distance from the great 

 manufacturing centers where it would be most useful. 



673. Transmission cf Power. Recently it has been found 

 possible to transmit energy in the form of electric current 

 a distance of 200 miles with profit. On the map (Fig. 350) , 

 a circle with a 200 mile radius has been drawn about the 



FIG. 350. Distribution of water power of United States. The heavily 

 shaded portions show the regions where water power is easily available; the 

 horizontally shaded portions, where hydro-electric power is easily available; 

 the vertical shading, where hydro-electric power is possibly available. 



power plants at Niagara Falls and at Keokuk, Iowa. Any 

 point lying within these circles may easily be supplied with 

 power from these plants. St. Louis, Missouri, 137 miles 

 distant is now consuming the larger portion of the power 

 generated at Keokuk (Fig. 351). Much of the power gen- 

 erated at Niagara Falls is sold in 'the cities of western New 

 York. Many of the cities on the coast of California receive 

 practically all their power from HYDRO-ELECTRIC PLANTS 

 located many miles distant in the Sierra Nevada Mountains 

 (see Art, 570, Chap. IX). 



