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描述 |
English: Gilbert's "versorium", the first crude electroscope, invented by English physician William Gilbert around 1600. This was the first electrical measuring instrument. It consisted of a metal needle free to turn on a pivot, similar to a compass needle but unmagnetized. When an object charged with static electricity was brought near, the needle would swing around and point to it. The motion was due to the attraction of a temporary charge of opposite polarity induced in the near end of the needle by the external charge. |
日期 | 2001-11-25 |
来源 | http://www-spof.gsfc.nasa.gov/earthmag/NSTA1B.htm |
作者 | David P. Stern, [1] |
许可 (二次使用本文件) |
本作品是完全由美国国家航空航天局(NASA)创作,或由其雇员以个人公务目的创作;根据NASA的版权方针及美国法典第17篇第1章第105条(17 U.S. Code § 105),本作品在美国属于公有领域。 请注意:
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