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A ship mill is a type of watermill. The milling and grinding technology and the drive (waterwheel) are built on a floating platform on this type of mill.〔 "Deutsches Museum: Ship Mill", The Deutsches Museum's collections: Ship Mill (Model), 1819 (''see below:'' External links).〕 Its first recorded use dates back to mid-6th century AD Italy.〔 ==Technology== Between barge and boat well is the undershot water wheel, which is driven by the flowing water of the current. There is also evidence of water mills for which both sides had a narrower water wheel, similar to an old paddle steamer. The floating platform is anchored at the most intense point in the current, to the bridge piers for easy access to the mill, or to the shore. Floating allows the mill to operate with the same power despite changing water levels. The efficiency of the mill can at best match a standard undershot mill. Ship mills could potentially run full-time, good for tasks that demanded constant power. Ship mills could be drawn when needed (due to shipping, rafting, ice) to shore. In central Europe ship mills were, as most water and wind mills, owned by lords or monasteries. Ship mills in Central Europe have not remained; after the advent of riverboat traffic, they became a hindrance. Ship mills last about fifty years. File:Schiffmuehle01.jpg|A ship mill (drawing 1 after H.Ernst, 1805). File:Schiffmuehle02.jpg|A ship mill (drawing 2 after H.Ernst, 1805). 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「Ship mill」の詳細全文を読む スポンサード リンク
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