Watermill
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A watermill or water mill is a mill that uses hydropower. It is a structure that uses a water wheel or water turbine to drive a mechanical process such as milling, rolling, or hammering. Such processe
Watermill of Braine-le-Château, Belgium (12th century)
Interior of the Lyme Regis watermill, UK (14th century)
Model of a Roman water-powered grain mill described by Vitruvius. The millstone (upper floor) is powered by an undershot waterwheel by the way of a gear mechanism (lower floor)
Roman turbine mill at Chemtou, Tunisia. The tangential water inflow of the millrace made the horizontal wheel in the shaft turn like a true turbine, the earliest known.
Windmill
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A windmill is a machine operated by the force of wind acting on vanes or sails to mill grain. Windmills were used throughout the high medieval and early modern periods; the horizontal or panemone wind
Watermill
…Sutter's Mill Windmill List of tide mills on Long Island…
Windmill in Sønderho, Fanø, Denmark. Dutch type, built in 1895.
Hooper's Mill, Margate, Kent, an eighteenth-century European horizontal windmill
A windmill in Kotka, Finland in May 1987
Windmill in the Azores islands, Portugal