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Ordnance Survey

Ordnance Survey (OS) is the national mapping agency for Great Britain. It's name indicates its original military purpose, which was to map the Scottish Highlands in the wake of the Jacobite rising of 1745 in order to locate dissenters. Later the threat of invasion by Napoleonic France gave rise to a more nationwide need for maps. The Principal Triangulation of Great Britain was undertaken between 1783–1853 by the Board of Ordnance, which led to the creation of the Ordnance Survey itself. The first one-inch-to-the-mile map was published in 1801. Later, a demand for larger scale maps led to the six-inches-per-mile survey, started in the 1840's. We stock a selection of early/mid 20th century OS sheets, and a handful of 19th century maps.