Major General William Roy measured a baseline as the start of the triangulation of Britain. This cannon is in Hampton England UK

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Major General William Roy carried out the triangulation and surveying of Great Britain 1784 the origins of the Ordnance Survey. The upturned cannon marks the SE end of the baseline used as the origin for this triangulation. It is in Roy Grove, Hampton. The NW end is 6 miles away at Heathrow Airport.

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Size: 4924px × 3060px
Location: Roy Grove, Hampton, SW London, England UK
Photo credit: © Julia Gavin / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: army, baseline, britain, british, cannon, cartographic, cartography, gb, general, great, gun, hampton, map, mapping, marker, measure, measured, muzzle, ordnance, os, roy, survey, surveying, triangulation