9th
June 2000 Sheihallion (NN 715548) is an exceptional mountain, in
that, for its bulk and height, it is not connected to any other mountains
by high ridge routes. For this reason it was chosen in 1776 as the mountain
where the first determination of the Gravitational Constant was made. Basically
they hung a weight on a bit of string next to it to see how much the mountain
attracted it (the real experiment design was vastly more sophisticated
than this). Of greater interest to fell walkers - this was the first mountain
ever to be contour mapped - so they could calculate its weight.
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