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Watch Map Man online: Episode 6 William Mudge's Ordnance Survey, 1st Edition, (1809)

Nicholas Crane examines the first Ordnance Survey map. The epic task of plotting out an entire nation to a scale of one inch to one mile fell to Lieutenant William Mudge, who began the project in Kent and Essex before moving on to Devon - the most likely targets for French attack during the Napoleonic era.

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