Blue plaque № 59558

Braes of Foss, Perth and Kinross, Scotland, United Kingdom

In the summer of 1774 the Reverend Nevil Maskelyne FRS, Astronomer Royal, set up observatories on either side of Schiehallion to measure by how much plumblines would be pulled out of the vertical towards the mountain by the gravitational force due to its mass, at the time, this was called 'The Attra

ction of Mountains', in effect, it became the first determination of Newton's Universal Gravitational Constant. The mountain was surveyed by Reuben Burrow of the Royal Observatory Greenwich. The calcu

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