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Windmills are powered by their sails. Sails are found in different designs, from primitive common sails to the advanced patent sails. ==Jib sails== The jib sail is found in Mediterranean countries and consists of a simple triangle of cloth wound round a spar. The mill must be stopped in order to adjust the reefing of the sail. Though rare in the UK, at least two windmills are known to have had jib sails (St Mary's, Isle of Scilly and Cann Mills, Melbury Abbas). Image:Windmill Antimahia Kos.jpg|Jib sails Image:Sobreiro.jpg|More fully spread Image:Spanish Mill, St Mary's.jpg|St Mary's, Isles of Scilly File:Cann Mill, Melbury Abbas.jpg|Cann Mills, Melbury Abbas 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Windmill sail」の詳細全文を読む スポンサード リンク
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