Document
Sevenoaks (Kent) reverse
Drawing on the reverse side of OSD 100,pt.1 (folio V, serial no. 353). Only the skeleton of a drawing is presented here. Pencil lines radiate from fixed points, representing angular measurements taken from trigonometrical stations.,Churches were often chosen for such stations, due to the clear views afforded by their tall towers or spires. On this map, an outlined red cross indicates a church, 'St Clements', with a windmill nearby.
The British Library1799
1799