2.14 Do Mountains have Roots? Surveying the Himalayas of India with a Plumb-Bob
Channel: Snow Mountain
Date: 2020-08-28

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2.14 Do Mountains have Roots? Surveying the Himalayas of India with a Plumb-Bob

One of the major advances in determining the structure of mountains occurred in the 1840s when Sir George Everest, after whom Mount Everest is named, conducted the first geographical survey in India. During this survey, the distance between the towns of Kalianpur and Kaliana, located south of the Himalayan range, was measured using two different methods. One method employed the conventional surveying technique of triangulation, and the other method determined the distance astronomically. Although the two techniques should have given similar results, the astronomical calculations placed these towns nearly 150 meters closer to each other than did the triangulation survey.

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