Ordnance Survey First Series. The first completed map was of the county of Kent in 1801. The first use of the term Ordnance Survey in manuscript was in 1801, but it did not appear on an engraved map until 1810. William Mudge was the effective head from the start and actual head of the Survey from 1804 to 1820.
Reproduced from the 1805 Ordnance Survey map.
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Coverage of full size map: