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National Grid maps began to be issued after the war, but it was some time before there was full coverage. In the interim, the public were allowed to purchase War Office Cassini Grid maps. [1] National Grid maps at 1:25,000 scale (often referred to as 2 1 ⁄ 2 inches to the mile, or just 2 1 ⁄ 2-inch maps) were not introduced until as late as ...
Versailles on the Cassini map. The Cassini Map or Academy's Map is the first topographic and geometric map made of the Kingdom of France as a whole. It was compiled by the Cassini family, mainly César-François Cassini (Cassini III) and his son Jean-Dominique Cassini (Cassini IV) in the 1700s. It was on a scale of one line to 100 toises, i.e ...
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 .
General Map of the Environs of Dublin and parts of Wicklow Google Map interface; 1852 Dublin Street Directory Map showing the boundaries of several wards Size: 40.5 cm x 28 cm. Scale: 4 and one-eighth inches to one statute mile. General Post Office Directory. Colour map Flickr photo; 1863 Dublin showing the Boundaries of several Wards.
As such, the greater the longitudinal extent of the area, the worse the distortion becomes. Due to this, the Cassini projection works best for areas with greater north–south extent than east–west. For example, Ordnance Survey maps of Great Britain used the Cassini projection from 1924 until the introduction of the National Grid. [3] [4]
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 earliest cartographic reference to the hill is found in the 1837–1842 Ordnance Survey Ireland 6 Inch map, which can be seen on the Ordnance Survey Ireland website. In cartography, the hill was referred to as Carn Clonhugh, but by the time of the 2nd edition 1887–1913 Ordnance Survey Ireland 25 Inch map, that was replaced with Corn (a ...
Historic Maps Collection. 18th and 19th-century historic maps of Ireland. A UCD Digital Library Collection. 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.