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Jesse Ramsden FRS FRSE (6 October 1735 – 5 November 1800) was an English mathematician, astronomical and scientific instrument maker. ==Life== Ramsden was born at Salterhebble, Halifax, West Riding of Yorkshire, England.〔 Dictionary of National Biography〕 Having attended the free school at Halifax for three years, he was sent at the age of twelve to his uncle at Craven in the North Riding, and there studied mathematics under the Rev. Mr. Hall. After serving his apprenticeship as a cloth-worker in Halifax, he went to London where, in 1755, he became a clerk in a cloth warehouse. In 1758 he was apprenticed to a mathematical instrument maker〔The workshop of Mr Burton in Denmark Street.〕 and he proved so proficient that he was able to set up his own business only four years later. The quality and accuracy of his instruments established his reputation as the most able instrument maker in Europe for the next forty years until his death in 1800.〔 Jesse Ramsden (1735–1800).〕 Ramsden married Sarah Dollond, daughter of John Dollond the famous maker of high quality lenses and optical instruments. Little is known of their life together but Sarah did not accompany him when he moved his workshop (and home). They had no children. In his later years he lived above the workshop with a number of his apprentices. Ramsden was of a genial disposition, clearly brought out by the portrait shown here, but at the same time he infuriated his clients with his tardiness in delivering their purchases, particularly of the larger commissions. The acrimony sometimes got out of hand. For example Ramsen's three-year delay in providing William Roy with the theodolite for the Anglo-French Survey (1784–1790) provoked a public row within the portals of the Royal Society and in the Philosophical Transactions.〔 describes the argument between Roy and Ramsden.〕 In his favour it should be pointed out that many delays could be attributabed to Ramsden's quest for perfection, continually refining his designs as the slightest shortcomings were revealed.〔 He was elected to the Royal Society in 1786 and to the Royal Society of Edinburgh in (probably) 1898.〔(【引用サイトリンク】title=Former RSE Fellows 1783- 2002 (page 144) )〕 The Copley Medal of the Royal Society was bestowed upon him in 1795 for his 'various inventions and improvements in philosophical instruments.’ He died five years later at Brighton, England. 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「Jesse Ramsden」の詳細全文を読む スポンサード リンク
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