Diagram of magnetic dip on Earth

Diagram of magnetic dip on Earth

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Credit: SCIENCE PHOTO LIBRARY

Caption: Diagram of the Earth's magnetic field. Engraving showing the dip of the Earth's magnetic field at various latitudes, after the work of William Gilbert (1540-1603). In this picture, line AB is the equator, C is the North Magnetic Pole (Arctic) and D the South Magnetic Pole (Antarctic). The tip of the arrows are magnetic south, and the direction of the arrows indicates the direction a freely-rotating compass would point. To test the hypothesis, Gilbert used a special round lodestone called a terrela.

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

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