Windmill.

Patent for a new and improved windmill. This design is "to combine with a windmill a horse-power, so that when the wind ceases to operate the wheel, horse-power may be brought into use for the purpose of continuing the revolution of the wheel, so as to enable the windmill to be used like an ordinary horse-power, and to place the slides or doors upon suitable supports, so that they can be moved back and forth in relation to the wheel for the purpose of cutting off the wind from it" (lines 14-23)