South Shields, Tyne and Wear

Harton Pit in South Shields was the site of Airy's 1854 experiment to determine the gravitational constant by timing pendulums at the surface and the bottom of the 1260ft pit. A commemorative plaque was erected in 1992, on the centenary of Airy's death, on a site in South Tyneside General Hospital, near where the pit had been. [Turnbull] The experiment was supervised and the calculations were carried out by Edwin Dunkin of the Greenwich Observatory and yielded a mean density of the earth of 6.565 [Proctor]; [Stewart].

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An extract from The Mathematical Gazetteer of the British Isles created by David Singmaster

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