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. (Hermann von Helmholtz)

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.

Hermann von Helmholtz

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action air drive falling great holland instance motion north supply velocity water wind germany sails

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