The post mill is the earliest type of European windmill. Its defining feature is that the whole body of the mill that houses the machinery is mounted on a single central vertical post. The vertical post is supported by four quarter bars. These are struts that steady the central post.
Brill windmill, a 17th-century post mill in Buckinghamshire
Chillenden post mill, built in 1868.
Chillenden open trestle post mill (another view).
Friston Post Mill, near Friston, Suffolk.
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.