Types of windmill projects include:
A model windmill with sails two feet across
A working windmill with sails six feet across, suitable for pumping water
A practical windmill with sails ten feet across, capable of producing up to one-half horse power and able to run light machinery
For those interested in developing alternate, off-the-grid sources of energy, or even those who like to build for fun, Windmills and Wind Motors is a classic, useful guide to harnessing wind power.
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