J2974 : Spider, Black Mountain North Triangulation Pillar

taken 6 years ago, near to Legoneil and Springfield, Northern Ireland

Spider, Black Mountain North Triangulation Pillar
Spider, Black Mountain North Triangulation Pillar
Detail of the 'spider' on Black Mountain North Triangulation Pillar J2974 : Black Mountain North Triangulation Pillar. Considerable damage to the concrete and the screw cap is not marked (most other OSNI examples have either "TRIANGULATION STATION
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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J2974, 12 images   (more nearby )
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Date Taken
Monday, 2 January, 2012   (more nearby)
Tuesday, 3 January, 2012
Geographical Context
Place (from Tags)
Divis Mountain  Belfast  Black Mountain 
Subject Location
Irish: geotagged! J 293 748 [100m precision]
WGS84: 54:36.3184N 5:59.9311W
Camera Location
Irish: geotagged! J 293 748
View Direction
Northeast (about 45 degrees)
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Image classification(about): Supplemental image
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