NN7555 : The Maskelyne Plaque at Braes of Foss

taken 11 years ago, 4 km from Tummel Bridge, Perth And Kinross, Great Britain

The Maskelyne Plaque at Braes of Foss
The Maskelyne Plaque at Braes of Foss
This plaque is at the start of the normal path up Schiehallion, and marks the experiment often described as 'Weighing the Earth'. Of particular interest to hillwalkers are the remarks about the first use of contour lines on land (though some charts used by navigators used a similar method to delineate the depth of the sea, especially when close inshore).

Schiehallion was chosen for the experiment because of its symmetrical shape and the fact that it was an isolated mountain, not part of a range. The accuracy both of the survey and the plumbline measurements, often in bad conditions, was (for the time) almost incredible.

As both an astronomer and a keen hillwalker, this plaque has double resonance for me!
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NN7555, 46 images   (more nearby )
Photographer
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Date Taken
Saturday, 14 October, 2006   (more nearby)
Submitted
Sunday, 10 January, 2010
Category
Plaque   (more nearby)
Subject Location
OSGB36: geotagged! NN 753 557 [100m precision]
WGS84: 56:40.5823N 4:2.2101W
Camera Location
OSGB36: geotagged! NN 753 557
View Direction
South-southeast (about 157 degrees)
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