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Hadlow, Kent
This plan of the North Downs in Kent extends from Addington and Ryarsh, on the left, to Barming Heath, on the bottom right. Rays in red ink intersect across the map, evidence of angular measurements taken by the surveyor between fixed triangulation points. The ruled black sheet lines indicate the edges of the area that will be copied for the finished drawing OSD 120.
The British Library1789
1789