翻訳と辞書 Words near each other ・ Zhang Shuguang (engineer) ・ Zhang Shuhong ・ Zhang Shujing ・ Zhang Shun ・ Zhang Shunzi ・ Zhang Shuo ・ Zhang Shuo (footballer) ・ Zhang Shuo (gymnast) ・ Zhang Shuqi ・ Zhang Shusheng ・ Zhang Si ・ Zhang Sicheng ・ Zhang Side ・ Zhang Sipeng ・ Zhang Siqing ・ Zhang Sixun ・ Zhang Sizhi ・ Zhang Song ・ Zhang Tailei ・ Zhang Tang ・ Zhang Taofang ・ Zhang Te ・ Zhang Tengyue ・ Zhang Ti ・ Zhang Tian ・ Zhang Tianhan ・ Zhang Tianran ・ Zhang Tianxi ・ Zhang Tianxin ・ Zhang Tianyi Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Zhang Sixun ： ウィキペディア英語版 Zhang Sixun Zhang Sixun (, fl. 10th century) was a Chinese astronomer and military engineer from Bazhong, Sichuan during the early Song Dynasty (960-1279 AD).〔Liu, 577.〕 He is credited with creating an armillary sphere for his astronomical clock tower that employed the use of liquid mercury (dripped periodically from a clepsydra clock).〔Needham, Volume 4, 469-471.〕 The liquid mercury filled scoops of the waterwheel would rotate and thus provide the effect of an escapement mechanism in clockworks and allow the astronomical armillary sphere to rotate as needed.〔 He designed the model for his armillary sphere in 976 and completed the creation of it in 977.〔 ==Life and works== Zhang Sixun, although innovative, built upon the efforts of those before him. It was the Han Dynasty era scientist and engineer Zhang Heng (78-139 AD) who invented the first hydraulic-powered (i.e. with waterwheel and clepsydra) armillary sphere. In addition, it was the Tang Dynasty era Buddhist monk and engineer Yi Xing (683-727 AD) who invented the first hydraulic-powered armillary sphere that incorporated the escapement mechanism. Yet Zhang Sixun applied some innovative ideas of his own in order for his hydraulic-powered armillary sphere to function. His astronomical armillary sphere and clock was much like that of the later statesman Su Song (1020-1101 AD), incorporating the scoop-bearing driving-wheel and gearing, together with 19 clock jacks to report and sound the hours.〔Needham, Volume 4, 469.〕〔Needham, Volume 4, Part 2, 165.〕 His device also employed the use of liquid mercury in the closed circuit of the clepsydra and waterwheel instead of water, because water would freeze easily during winter, while mercury could assure smooth and continual function and time-keeping during the cold season.〔 Later Ming Dynasty clocks had the same concern in mind when they employed the use of falling sand grains to push the wheel drive.〔Needham, Volume 4, Part 2, 510–511.〕 The later Su Song wrote that after Zhang's death, no one could replicate what he had achieved,〔Needham, Volume 4, 470.〕 much like with Su Song himself and his astronomical clock tower after his own death. 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「Zhang Sixun」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.