sunlight that fall upon our earth will be utilized and will doubtless be
the cheapest and most efficient of all the motor forces. If you can only
focus this widely distributed energy, you can obtain any amount of heat
and consequently power. It has been proved that you can boil two pints
of water with the heat of the sun falling upon one and one-half square
yards of surface. One square yard of sunshine represents one horse
power. The problem, therefore, is to concentrate. This will be done some
day by the use of immense convex mirrors. Already experiments are being
tried, and the first promoters of this scheme will have the power of the
world at their feet and its wealth in their hands.