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Engraving of mediaeval preparation of theriac
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Images Dated 18th October 1993
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Abstract
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South America
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All Images
> 1993
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>>> 18 Oct 1993
>>> 20 Oct 1993
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Engraving of mediaeval preparation of theriac
Science Photo Library
Full Range of Prints and Gifts in Stock
Featured 18 Oct 1993 Print
Diagram of magnetic dip on Earth
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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