J5985 : Lighthouse Island Triangulation Station

taken 7 years ago, 7 km from Groomsport, Northern Ireland

Lighthouse Island Triangulation Station
Lighthouse Island Triangulation Station
The triangulation station on Lighthouse Island is one of only two Ordnance Survey Northern Ireland stations not topped by a pillar. Instead, it consists solely of a brass stud driven into living rock. See J5985 : Lighthouse Island Triangulation Station for a wider angle look at the rocks.
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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J5985, 19 images   (more nearby )
Photographer
Contributed by
Rossographer   (find more nearby)
Date Taken
Saturday, 26 June, 2010   (more nearby)
Submitted
Friday, 3 June, 2011
Geographical Context
Village, Rural settlement  Islands 
Place (from Tags)
Northern Ireland  Lighthouse Island 
Subject Location
Irish: geotagged! J 59684 85858 [1m precision]
WGS84: 54:41.7262N 5:31.4408W
Camera Location
Irish: geotagged! J 59684 85858
View Direction
Northeast (about 45 degrees)
Clickable map
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Image classification(about): Supplemental image
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