The original Trigonomic Survey uses Neath Barrow as one of its points.
The details are available in this book;
An account of the operations carried out for accomplishing a trigonometrical ... By William Mudge, Isaac Dalby, Thomas Colby, Great Britain. Ordnance Survey
Annoyingly the relevant map Plate VII isn't fully scanned - though presumably others will have a copy.
I'm not sure I understand the angles and distances figures in the attached scan
But I have mapped one place that is the stated distance (32882 feet) from the Beacon Hill Trig Point. - It is also about the right distance from Red Horn Hill, because that distance is given from Red Horn Clump which I don't know the exact position of.
There seems to be a second distance from Beacon Hill given (32869) feet, which is strange. And I am only guessing the Beacon Hill measurement is from where the Trig point was put up.
Frustratingly close to accurately pin pointing the Barrow,
View Neath Barrow? in a larger map
UPDATE _ http://www.sarsen.org/2011/12/neath-barrow-mystery-solved-its-robin.html
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