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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 Chester Shot Tower ： ウィキペディア英語版 Chester Shot Tower Chester Shot Tower, also known as Boughton Shot Tower, is a grade-II *-listed shot tower located at in the Boughton district of Chester, England. The tower stands beside the Shropshire Union Canal and forms part of the disused Chester Leadworks. Built by Walkers, Parker & Co. in 1799, the tower is the oldest of three remaining shot towers in the UK,〔(Images of England: Chester Leadworks and Shot Tower )〕〔(Images of England: Lead Shot Tower, Cheese Lane, Bristol )〕 and probably the oldest such structure still standing in the world. The circular red-brick tower is 168 feet (41.2 m) tall and 30 feet (9.1 m) in diameter at the base tapering to 20 feet (6 m) at the top, with small arched windows.〔 A lift shaft dating from 1971 remains attached to the exterior; the interior retains a spiral staircase and melting pots.〔〔(Level Two: Leadworks / Shot Tower )〕 ==Drop process of lead shot manufacture== The tower was one of the earliest built to manufacture lead shot using the method pioneered in the 1780s by the Bristol inventor William Watts.〔 Molten lead was poured through a pierced copper plate or sieve at the top of the tower, with the droplets forming perfect spheres by surface tension during the fall; the spherical drops were then cooled in a vat of water at the base.〔(NASA: The Early History of Drop Towers )〕 Watts' process was less labour-intensive than the earlier method of casting shot in moulds. An early use of the tower was to make lead shot for muskets in the Napoleonic Wars.〔 Although other methods were developed to manufacture shot during the 20th century, the Chester tower was still in use as late as 2001.〔(B&W Picture Place )〕 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「Chester Shot Tower」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.