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Medium: Pen and ink on paper

Date: 1817

Shelfmark: OSD 163

Item number: 20

Length: 17

Width: 12

Genre: Map

Map scale ratio: 2'' : 1 Mile (1 : 31680)

This unfinished drawing shows a small section of road, with milestones labelled "M.S". Dots within circles represent trigonometrical stations, from which the surveyor took angular readings to determine the locations of topographical features. Reflecting the military emphasis of the survey, the finished drawings show the road system in great detail, an important consideration for a military campaign.

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