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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Worsley Navigable Levels ： ウィキペディア英語版 Worsley Navigable Levels The Worsley Navigable Levels are an extensive series of coal mines in Worsley in the City of Salford in Greater Manchester, England. They were worked largely by the use of underground canals (the navigable levels) and boats called starvationers. ==In the beginning== Coal getting is known in the area from as early as 1376 but large-scale development was left until the tenure of Francis Egerton, 3rd Duke of Bridgewater. The first drainage sough was cut into the Earl of Bridgewater's estates in Worsley on the Manchester Coalfield in 1729 under the auspices of John Massey, the mines agent of Scroop Egerton, the 4th Earl and 1st Duke of Bridgewater. This sough was sited to provide drainage for as many mine works as possible in order to make its construction economic. The sough was long with underground. Water in the coal measures worked above the sough drained into it and deeper coal seams benefited because water needed to be lifted only to the sough not to the surface. This solution to the water drainage problem was successful and extensions of proceeded to allow other coal seams to be drained.〔 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「Worsley Navigable Levels」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.