Diagram of magnetic dip on Earth

Diagram of magnetic dip on Earth

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Credit: SCIENCE PHOTO LIBRARY

Caption: Earth's magnetic field. Engraving of the dip of the Earth's magnetic field at various latitudes drawn by William Gilbert (1544-1603). The north- south axis is horizontal. The orientations of the magnetic field lines at various points are shown by the thick lines in the upper frame. The space in which the magnetic dip is detectable was called the Orbis Virtutis by Gilbert. He obtained his data using a spherical lodestone (terella) & short pieces of iron wire. The observed phenomena at different lattitudes on Earth are the same. Gilb- ert was the first person to consider the Earth as a vast spherical magnet. Image taken from Gilbert's De Magnete of 1600.

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Keywords: earth, gilbert, historical, history, history of science, magnetic field, magnetism, physics, technology, terrella, william

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