Woodcut from De Re Metallica. Triangulation applied to a tunnel being driven to meet a shaft. HDE is a cord suspended over the shaft, HFG is a second cord connecting to the mouth of the tunnel, and KL is a third cord to help establish the triangle. This provides a ratio for determining the tunnel's length. Georgius Agricola (March 24, 1494 - November 21, 1555) was a German scholar known as "the father of mineralogy".

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Georgius Agricola, De Re Metallica, Triangulation

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