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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 heed 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 cost 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. Tvery 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 
