The post mill is the earliest type of European windmill. The defining feature is that the whole body of the mill that houses the machinery is mounted on a single vertical post, around which it can be turned to bring the sails into the wind. The earliest post mills in England are thought to have been built in the 12th century. The earliest working ...
Found on
http://en.wikipedia.org/wiki/Post_mill
(from the article `technology, history of`) ...in places such as Spain or the downlands of England on the one hand, and in the fenlands and polders of The Netherlands on the other hand. The ... ...sails on a horizontal axis, derives directly from the Roman water mill with its right-angle drive to the stones through a single pair of gear...
Found on
http://www.britannica.com/eb/a-z/p/100
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