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of using the energy of the sun's rays. You should remember that some- 

 times we do not have enough sunshine in Indiana in a week to supply 

 heat for a cup of coffee. It is a fact that where heat is most needed, 

 and when it is most needed, to heat our homes and run our factories, 

 there and then is the least sunshine. Imagine London depending on sun- 

 shine for heat and power. In winter when we need the most heat the 

 sun shines the fewest hours per day, the fewest days per week, and the 

 sun's rays are most oblique. Taking into consideration the necessarily 

 low efficiency of any engine working between the temperature limits of 

 an engine for using the sun's radiation, and the very large surface from 

 which the energy would have to be gathered, men of science are agreed that 

 the prospect of a practical sunshine engine are exceedingly remote. 



Finally it may be argued that the writer has failed to see a rift in 

 the clouds arising from the possibilities of water power. The answer is, 

 there is no rift there. No doubt the use of water power will postpone 

 the gathering of the clouds, but it will not disperse them. Leaving out 

 of consideration the fact that water power is usually most abundant where 

 least needed, that the available power varies greatly with the seasons, that 

 the available water power is diminishing from year to year with the removal 

 of forests and the draining of swamp lands, let us remember the fact that 

 the total water power of the world is almost nothing compared with man's 

 demands. 



A single ocean liner burns fifty car loads of coal per day. To supply 

 the power for such a liner would require ten such water power plants 

 as the one on White River at Williams, near Bedford, which cast several 

 hundred thousand dollars. Then. too. it would require all the ten plants 

 to operate at full capacity, which the Williams plant can not do a con- 

 siderable portion of the year, the supply of water being insufficient. The 

 writer is informed that it is not using water power at all as this is being 

 written. 



Every fifteen days the new automobiles marketed by a single manu- 

 facturer of cars of low horsepower equals the entire water power de- 

 velopment of the Mississippi River, at Keokuk. Every thirty days the new 

 engines turned out by this one firm equal in power the total water power 

 developed at Niagara. The total horsepower of the automobiles now reg- 

 istered in the United States is greater than the estimated total available 

 water power of the country. 



It would appear that one need not go further to show the utter 



