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In 1854, "twenty-five inch" maps were introduced with a scale of 1:2500 (25.344 inches to the mile) and the six inch maps were then based on these twenty-five inch maps. The first edition of the two scales was completed by the 1890s, with a second edition completed in the 1890s and 1900s.
Map scales may be expressed in words (a lexical scale), as a ratio, or as a fraction. Examples are: 'one centimetre to one hundred metres' or 1:10,000 or 1/10,000 'one inch to one mile' or 1:63,360 or 1/63,360 'one centimetre to one thousand kilometres' or 1:100,000,000 or 1/100,000,000.
The Ordnance Survey began producing six inch to the mile (1:10,560) maps of Great Britain in the 1840s, modelled on its first large-scale maps of Ireland from the mid-1830s. This was partly in response to the Tithe Commutation Act 1836 which led to calls for a large-scale survey of England and Wales.
Bartholomew was the only survivor of a number of important map publishers in Scotland, and was known for a prolific output and variety of maps and atlases for academic, commercial and travel purposes, including the popular 62-sheet Half-Inch to One Mile map series of Great Britain, which transmuted into the 1:100,000 National map series in the 1970s.
[6] [7] This survey at a scale of 1 inch to 1000 yards (1:36,000) [8] was the starting point of the Principal Triangulation of Great Britain (1783–1853), and led to the creation of the Ordnance Survey itself; work was begun in earnest in 1790, when the Board of Ordnance began a national military survey at one-inch-to-the-mile (1:63,360 scale ...
A complete set of UK 1 inch/mile maps from the late 1940s and early 1950s has been collected, scanned, and is available online as a resource for contributors.
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Produced under the direction of A. Gross, (London: Geographia, 1921; British Library shelfmark Maps 1080.(70.)). The intermediate mapping is the Ordnance Survey of Great Britain. Scale of ten statute miles to one inch. 1:633 600 maps from 1904 (British Library shelfmark Maps 1125.(14.)). The Ordnance Survey First Series.