一根磁化的针穿过一个软木球,漂浮在一个水杯中,显示出倾角和磁极的方向。来自William Gilbert De Magnete,伦敦1600(A magnetized needle pushed through a ball of cork, and floating submerged in a goblet of water, shows dip and the direction of the magnetic pole. From William Gilbert De Magnete, London 1600)威廉·吉尔伯特 |
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16世紀
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· 图片ID: 259901
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