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Samuel Hunter Christie (22 March 1784 – 24 January 1865) was a British scientist and mathematician. ==Life== He studied mathematics at Trinity College, Cambridge, where he won the Smith's Prize and was second wrangler. He was particularly interested in magnetism, studying the earth's magnetic field and designing improvements to the magnetic compass. Some of his magnetic research was done in collaboration with Peter Barlow. He became a Fellow of the Royal Society in 1826, delivered their Bakerian Lecture in 1833 and served as their Secretary from 1837 to 1853. In 1833 he published his 'diamond' method, the forerunner of the Wheatstone bridge, in a paper〔S. Hunter Christie, ''The Bakerian Lecture: Experimental Determination of the Laws of Magneto-electric Induction in different masses of the same metal, and its intensity in different metals.'', Philosophical Transactions of the Royal Society of London, vol. 123, 1833, pp. 95–142.〕 on the magnetic and electrical properties of metals, as a method for comparing the resistances of wires of different thicknesses. However, the method went unrecognised until 1843, when Charles Wheatstone proposed it, in another paper〔Charles Wheatstone, ''The Bakerian Lecture: An Account of Several New Instruments and Processes for Determining the Constants of a Voltaic Circuit'', Philosophical Transactions of the Royal Society of London, vol. 133, 1843, pp. 303–327.〕 for the Royal Society, for measuring resistance in electrical circuits. Although Wheatstone presented it as Christie's invention, it is his name, rather than Christie's, that is now associated with the device.〔''The Genesis of the Wheatstone Bridge'' by Stig Ekelof discusses Christie's and Wheatstone's contributions, and why the bridge carries Wheatstone's name. Published in "Engineering Science and Education Journal", volume 10, no 1, February 2001, pages 37–40.〕 Christie taught mathematics at the Royal Military Academy, Woolwich, from 1838 until his retirement in 1854.〔 He died at Twickenham, on 24 January 1865. A portrait photograph of Christie in 1865 by Ernest Edwards is held by the National Portrait Gallery. 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「Samuel Hunter Christie」の詳細全文を読む スポンサード リンク
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