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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 International System of Electrical and Magnetic Units ： ウィキペディア英語版 International System of Electrical and Magnetic Units The International System of Electrical and Magnetic Units is an obsolete system of units used solely for measuring electrical and magnetic quantities. It was introduced by the Fourth International Electrical Congress (Chicago, 1893) and modified in 1908. It was rendered obsolete by the inclusion of electromagnetic units in the International System of Units (SI) in 1948. ==Earlier systems== The link between electromagnetic units and the more familiar units of length, mass and time was first demonstrated by Gauss in 1832 with his measurement of the Earth's magnetic field,〔. (English translation ).〕 and the principle was extended to electrical measurements by Neumann in 1845.〔; . ; .〕 A complete system of metric electrical and magnetic units was proposed by Weber in 1851.〔.〕〔Weber's original proposal was based on a millimetre–milligram–second system of units.〕 The development of the electric telegraph (an invention of Gauss and Weber) demonstrated the need for accurate electrical measurements. At the behest of Thomson, the British Association for the Advancement of Science (B.A.) set up a committee in 1862 to examine the options for standardizing electrical and magnetic units. After much discussion, the committee decided to adapt Weber's proposals to the CGS system of units:〔.〕〔 however the resulting "absolute" units were both difficult to realize and (often) impractically small. To overcome these handicaps, the B.A. also proposed a set of "practical" or "reproduceable" units, which were not directly linked to the CGS system but which were, as near as experimental accuracy allowed, equal to multiples of the corresponding CGS units.〔.〕〔It soon became apparent that the B.A. had developed ''two'' sets of CGS units. The practical units were based on the electromagnetic set of units rather than on the electrostatic set.〕 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「International System of Electrical and Magnetic Units」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.