Berton Sails
In France some mills have a system of longitudinal shutters running the length of the sail. The system is called Ailes Berton, which translates as Berton sails. These sails can be adjusted without stopping the mill.
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Berton sails closed
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Berton sails open
Read more about this topic: Windmill Sail
Famous quotes containing the word sails:
“Raphael paints wisdom; Handel sings it, Phidias carves it, Shakespeare writes it, Wren builds it, Columbus sails it, Luther preaches it, Washington arms it, Watt mechanizes it.”
—Ralph Waldo Emerson (1803–1882)