spring sail

instrument

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In windmill
…Meikle, a Scot, invented his spring sail, substituting hinged shutters, like those of a Venetian blind, for sailcloths and controlling them by a connecting bar and a spring on each sail. Each spring had to be adjusted individually with the mill at rest according to the power required; the sails…
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In energy conversion: Windmills
…a Scottish millwright, invented the spring sail, a shutter arrangement similar to a venetian blind in which the sails were controlled by a spring. When the wind pressure exceeded a preset amount, the shutters opened to let some of the wind pass through. In 1789 Stephen Hooper of England introduced…
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