Windmills, which are used in the great plains of Holland and North Germany to supply the want of falling water, afford another instance of the action of velo...

Windmills, which are used in the great plains of Holland and North Germany to supply the want of falling water, afford another instance of the action of velocity. The sails are driven by air in motion - by wind.

quote by Hermann von Helmholtz
Submitted by Lucian Velea
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