numbers are rapidly increasing as their merits become known. The field
for the use of wind mills is almost unlimited, and embraces pumping
water, drainage, irrigation, elevating, grinding, shelling, and cleaning
grain, ginning cotton, sawing wood, churning, running stamp mills, and
charging electrical accumulators. This last may be the solution of the
St. Louis gas question.

In the writer's opinion the settlement of the great tableland lying
between the Mississippi Valley and the Rocky Mountains, and extending
from the Gulf of Mexico to the Red River of the North, would be greatly
retarded, if not entirely impracticable, in large sections where no
water is found at less than 100 to 500 feet below the surface, if it
were not for the American wind mill; large cattle ranges without any
surface water have been made available by the use of wind mills. Water
pumped out of the ground remains about the same temperature during the
year, and is much better for cattle than surface water. It yet remains
in the future to determine what the wind mill will not do with the
improvements that are being made from to time.

* * * * *




THE PNEUMATIC DYNAMITE GUN.


It is here shown as mounted on a torpedo launch and ready for action.
The shell or projectile is fired by compressed air, admitted from an air
reservoir underneath by a simple pressure of the gunner's finger over