Spring Patent Sails
Spring patent sails have a spring to enable each sail to be adjusted individually, with the patent sail system allowing all sails to be adjusted without stopping the mill. The system was not a common one.
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Famous quotes containing the words spring, patent and/or sails:
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—Henry David Thoreau (1817–1862)
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—Henry David Thoreau (1817–1862)
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—Henry David Thoreau (1817–1862)