A memorial to William Mudge and his triangulation of Britain, forming the baseline of the Ordnance Survey. At this point beside the A345 in Wiltshire is a cannon positioned vertically in the ground, which formed one end of the triangulation baseline made here in June 1794. This large inscribed stone was erected in 1967. The inscription reads "In 1794 a line from this site to Beacon Hill was measured by Capt W Mudge of the Ordnance Survey as a base for the triangulation of Great Britain."
Published on August 05, 2025 12:42
