J0220 : Spider, Slieve Gullion Triangulation Pillar

taken 4 years ago, 5 km NNE of Forkhill, Co Armagh, Northern Ireland

Spider, Slieve Gullion Triangulation Pillar
Spider, Slieve Gullion Triangulation Pillar
The top of Slieve Gullion Triangulation Pillar J0220 : Slieve Gullion Triangulation Pillar.
Good condition and complete, the centre cap is marked OSNI Triangulation Station.
See also J0220 : Flush Bracket, Slieve Gullion Triangulation Pillar.
OSNI Triangulation Stations

The re-triangulation of Northern Ireland by the Ordnance Survey Northern Ireland began in 1950. This was the first complete survey of Northern Ireland which included observations with the new primary triangulation of the country, its connection with the Republic of Ireland and the cross-channel connection between Ireland and Great Britain. This began by OSNI establishing a series of triangulation stations throughout the country. Almost all of these stations were topped by trig pillars and 80, mainly primary and secondary pillars, had been constructed by October 1949. Measurements between primary stations began in 1950 and measurements for these and the secondary stations were completed by July 1956. The construction and measurements for tertiary stations were completed later (probably no later than the mid 1960s). Only two stations are not topped by pillars - Lighthouse Island, marked by a brass rivet, and Ardglass, which utilised the top of a high stone folly. The older triangulation stations on the Lough Foyle Base Line were also re-surveyed as part of this process. A majority of the stations are still extant today but a few have been removed or destroyed.

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J0220, 35 images   (more nearby search)
Photographer
Date Taken
Sunday, 27 September, 2020   (more nearby)
Submitted
Monday, 28 September, 2020
Geographical Context
Historic sites and artefacts  Uplands 
Place (from Tags)
Triangulation Station  Slieve Gullion 
Primary Subject of Photo
Trig Point 
Subject Location
Irish: geotagged! J 024 203 [100m precision]
WGS84: 54:7.3073N 6:26.0124W
Camera Location
Irish: geotagged! J 024 203
View Direction
NORTH (about 0 degrees)
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Image Type (about): close look 
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