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Online Ordnance Survey Maps of County Sligo; An eye on the Survey at History Ireland; 19th Century Ordnance Survey of Ireland at Translations; Ordnance Survey Ireland (OSi) 19th Century Historical Maps: collection of mainly 19th-century maps of almost 150 cities, towns, and villages in the Republic of Ireland. A UCD Digital Library Collection.
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 Ordnance Memoir of Ireland was a projected 1830s topography of Ireland to be published alongside the maps of the Ordnance Survey of Ireland using materials gathered by surveyors as they traversed the country. The project was cancelled in 1840 as too expensive and beyond the survey's original scope.
Maps of Dublin accompanying Thom's Official Directory, printed by the Ordnance Survey for the Dublin publisher Alexander Thom from the six-inch map sheets 18 and 22, and dating from the late 19th century. A UCD Digital Library Collection.
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.
During the 19th century an extensive series of maps of Ireland was created by the Irish division of the Ordnance Survey for taxation purposes. These maps both documented and standardised the boundaries of the more than 60,000 townlands in Ireland.
The civil parishes were included on the nineteenth-century maps of the Ordnance Survey of Ireland. [13] At the time of the 1861 census there were 2,428 civil parishes in Ireland (average area 34.8 square kilometres (13.4 sq mi; 8,600 acres)). [9] Poor Law districts were created in 1838, each centered on a large town.
Irish measure or plantation measure was a system of units of land measurement used in Ireland from the 16th century plantations until the 19th century, with residual use into the 20th century. The units were based on " English measure " but used a linear perch measuring 7 yards (6.4 m) as opposed to the English rod of 5.5 yards (5.0 m).