Sir William Cubitt FRS was an eminent English civil engineer and millwright. Born in Norfolk, England, he was employed in many of the great engineering undertakings of his time. He invented a type of windmill sail and the prison treadwheel, and was employed as chief engineer, at Ransomes of Ipswich, before moving to London. He worked on canals, docks, and railways, including the South Eastern Railway and the Great Northern Railway. He was the chief engineer of Crystal Palace erected at Hyde Park in 1851.
William Cubitt
A windmill is a structure that converts wind power into rotational energy using vanes called sails or blades, by tradition specifically to mill grain (gristmills), but in some parts of the English-speaking world, the term has also been extended to encompass windpumps, wind turbines, and other applications. The term wind engine is also sometimes used to describe such devices.
The windmills at Kinderdijk in the village of Kinderdijk, Netherlands is a UNESCO World Heritage Site
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.