一种带有铁块的terrella或球形磁铁,代表山脉,显示磁针的寻北特性。来自William Gilbert De Magnete,伦敦,1600(A terrella or globe-shaped magnet with lumps of iron to represent mountains and showing the north-seeking property of a magnetic needle. From William Gilbert De Magnete, London, 1600)威廉·吉尔伯特 |
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16世紀
· 图片ID: 286862
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