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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.
The original draftsman's drawings for the area around St Columb Major in Cornwall, made in 1810. Detail from 1901 Ordnance Survey map of the Imperial fortress colony of Bermuda (showing St. George's Town and St. George's Garrison), compiled from surveys carried out between 1897 and 1899 by Lieutenant Arthur Johnson Savage, Royal Engineers.
The Ordnance Survey Drawings are a series of 351 of the original preliminary drawings made by the surveyors of the Ordnance Survey between the 1780s and 1840 in preparation for the publication of the one-inch-to-the-mile "Old Series" of maps of England and Wales.
The first Ramsden theodolite as used by Roy. (Destroyed by bomb damage in 1941.) In the aftermath of the Jacobite rising of 1745, the Duke of Cumberland (military commander against the rebels) – advised by Lieutenant-Colonel David Watson, a Deputy Quartermaster-General of the Board of Ordnance – recognised that there was a need for an accurate map of the Scottish Highlands.
Accurate measurements were not available until the 19th century, as a by-product of the Ordnance Survey's boundary survey. The officially recorded areas were adjusted to match the new data at the time of the 1861 Census , replacing the less reliable figures previously used by the Registrar General .
The Ordnance Survey had always endeavoured to mark visible antiquities on its maps, and in 1920 had appointed its first archaeology officer: the role had subsequently developed into a department of specialists maintaining a national record of archaeological sites. In 1983 the responsibilities of the Archaeology Division were transferred to the ...
The OS MasterMap is the premier digital product of the Ordnance Survey. It was launched in November 2001. It is a database that records every fixed feature of Great Britain larger than a few meters in one continuous digital map. Every feature is given a unique TOID (TOpographical IDentifier), a simple identifier that includes no semantic ...
It is a public archive of architectural and archaeological records and holds over 12 million historic photographs, plans, drawings, reports, records and publications covering England's archaeology, architecture, social and local history. It is a dynamic collection, with records being added to this day.