Memorial plaque / tablet beside the barrel of a cannon in Roy Grove, Hampton. Major Gen. Roy used the line for Ordnance Survey triangulation. Hampton

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Memorial plaque / tablet beside the barrel of a cannon in Roy Grove, Hampton. Major Gen. Roy used the line for Ordnance Survey triangulation. The cannon marks one end of the original base line used by Major General William Roy and his team for the measurement by triangulation upon which all British Ordnance Survey maps were subsequently based. (86)

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Size: 4352px × 2904px
Location: Roy Grove, Hampton, UK
Photo credit: © David Gee / Alamy / Afripics
License: Licensed
Model Released: No

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