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:
“The hawk is aerial brother of the wave which he sails over and surveys, those his perfect air-inflated wings answering to the elemental unfledged pinions of the sea.”
—Henry David Thoreau (1817–1862)