539353 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 by Gilbert, William (1544-1603); (add.info.: "De Magnete, Magneticisque Corporibus"; English physicist experimenting in magnetism; Gilbert concluded that the earth was magnetic and this was why the compass pointed north; father of electricity; ); Universal History Archive/UIG; English, out of copyright.

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達志影像

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