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:
“It was a poetic recreation to watch those distant sails steering for half-fabulous ports, whose very names are a mysterious music to our ears.... It is remarkable that men do not sail the sea with more expectation. Nothing was ever accomplished in a prosaic mood.”
—Henry David Thoreau (1817–1862)