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:
“I call to mind the navy great
That the Greeks brought to Troye town,
And how the boistous winds did beat
Their ships, and rent their sails adown;
Till Agamemnon’s daughter’s blood
Appeased the gods that them withstood.”
—Henry Howard, Earl Of Surrey (1517?–1547)