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Wikipedia: The Schiehallion experiment was an eighteenth-century experiment to determine the mean density of the Earth. Funded by a grant from the Royal Society, it was conducted in the summer of 1774 around the Scottish mountain of Schiehallion, Perthshire. The experiment involved measuring the tiny deflection of a pendulum due to the gravitational attraction of a nearby mountain.
![[Schiehallion's isolated position and symmetrical shape lent themselves well to the experiment]](http://images.ookaboo.com/photo/s/Schiehallion_01_s.jpg "Schiehallion's isolated position and symmetrical shape lent themselves well to the experiment")
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![[Arthur's Seat, Edinburgh, the site of Henry James' 1856 experiment]](http://images.ookaboo.com/photo/s/Edinburgh_Arthur_Seat_dsc06165_1_s.jpg "Arthur's Seat, Edinburgh, the site of Henry James' 1856 experiment")
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 from Andrew2606 |
 from David.Monniaux |
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