Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 967
Cubitt devised amode of reefing the sails of windmills by introducing movable shutters on the sails of the mill,which shutters are closed by a governor, iike that of a Bteam-engine, operating upon a rod passingthrough the centre of the main axle. These shutters are suspended on pivots fixed about… … American Windmills differ from those of European construction essentially in the form of wheelreceiving the impulse of the wind. There are two methods in operation to regulate the extent ofsurface offered to the wind, viz., that of the centrifugal governor, and that of a side vane, whichis nearly…
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