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iceeci
Maskelyne did this by tracking the transit of 43 different stars from each observation station to triangulate what is known as "true vertical", ie, the angle of the pendulum, had it been suspended on a flat plain, affected only by the Earth's gravitational pull and nothing else. He discovered that from each observation station on either side of the mountain, there was a clear deviation of the pendulum away from true vertical, towards the mountain.
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