J3771 : Spider, Casaeldona Triangulation Pillar

taken 14 years ago, 5 km SE of Belfast, Co Antrim, Northern Ireland

Spider, Casaeldona Triangulation Pillar
Spider, Casaeldona Triangulation Pillar
Detail on the 'spider' on the Casaeldona Triangulation Pillar J3771 : Casaeldona Triangulation Pillar. Note that it is marked
"TRIANGULATION STATION
OSNI".
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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J3771, 13 images   (more nearby search)
Photographer
Date Taken
Wednesday, 2 June, 2010   (more nearby)
Submitted
Thursday, 3 June, 2010
Category
Triangulation Pillar   (more nearby)
Subject Location
Irish: geotagged! J 3741 7126 [10m precision]
WGS84: 54:34.2574N 5:52.5628W
Camera Location
Irish: geotagged! J 3741 7126
View Direction
NORTH (about 0 degrees)
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