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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.
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.
GeoHive Mapviewer Archived 6 July 2020 at the Wayback Machine: select Data Catalogue>Base Information and Mapping>Historic Map [25 inch (1888–1913) / 6 inch (1837–1842)] for old Ordnance Survey of Ireland maps; Logainm.ie (Placenames Database of Ireland) search/browse by parish/barony/county, English and Irish names; Goblet, Yann M., ed ...
He was also called upon to assist in the preparation of a Parliamentary bill to provide for the general valuation of Ireland. This act was passed in 1826 and Griffith was appointed Commissioner of Valuation in 1827, but did not start work until 1830 when the new 6-inch Ordnance Survey maps required by the statute became available.
Following the death of Edward O'Reilly in August 1830, he was recruited to the Topographical Department of the first Ordnance Survey of Ireland under George Petrie in October 1830. Apart from a brief period in 1833, he worked steadily for the Survey on place-name researches until 1842, unearthing and preserving many manuscripts.
Google Map interface; 1843 Ordnance Survey 6-inch First Edition Ordnance Survey: Scale 6 inches to 1 mile. OSI Mapviewer zoomable; 1848 Dublin. The General Post Office Directory Google Map interface; 1848 Environs of Dublin S. Orr and Co, Amen Corner, London Google Map interface; 1851 General Map of the Environs of Dublin and parts of Wicklow
One series of historic maps, published by Cassini, is a reprint of the Ordnance Survey first series from the mid-19th century but using the OS Landranger projection at 1:50,000 and given 1 km gridlines. This means that features from over 150 years ago fit almost exactly over their modern equivalents and modern grid references can be given to ...
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.