this process would be comparable to the maximum fwpplied by the moon only 



3 

 if h exceeded, say, 10 cm, but the time required to evaporate this 



quantity of water without its being replaced is much too long to be 



realistic. 



In a similar way it can be shown that the motion associated with 

 the density changes produced by heating or cooling are very small. 



Finally, it is necessary to consider the potential energy of 



D 



the 8xl0" grams of salt left behind at the surface each second by the 

 evaporating water. If this salt fell 4000 meters to the bottom of the 



ocean without mixing and transformed all its potential into kinetic energy, 



-1 -2 

 it would release 28 ergs sec cm . Obviously, such complete penetration 



cannot occur, but this mechanism could induce some small stirring of deep 



waters. 



Mention was not made of the effect of returning rain waters and a 



multitude of other possible processes. In any event, it would be hard to 



imagine that more energy could be obtained than in a process in which the 



sun served as a means of pumping distilled water from the surface of the 



ocean and returning it to the bottom of the ocean from which it eventually 



returns to the surface. Then, the same result would be obtained as was 



calculated for the falling salt precipitate. Thus the maximum kinetic 



-1 -2 

 energy realizable from solar heating of the water is below 56 ergs sec cm 



of ocean surface, as obtained by adding the hypothetical salt and fresh 



water contributions, 



-1 -2 

 It should be noted that the maximum value of 56 ergs sec cm 



for the kinetic energy imparted to the water by solar heat is very small 



-8- 



