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:
“She smiled and that transfigured me
And left me but a lout,
Maundering here, and maundering there,
Emptier of thought
Than the heavenly circuit of its stars
When the moon sails out.”
—William Butler Yeats (1865–1939)