D1136 : Knocklayd Triangulation Pillar

taken 10 months ago, 4 km S of Ballycastle, Co Antrim, Northern Ireland

Knocklayd Triangulation Pillar
Knocklayd Triangulation Pillar
Trig pillar at the summit of Knocklayd at 514m. The mountain is on the edge of the Antrim Hills with Ballycastle and Rathlin Island to the north. Access is via a long walk from Ballycastle or a short but steep ascent through Ballycastle Forest via the Drumavoley Road to the north-east.
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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D1136, 8 images   (more nearby search)
Photographer
Date Taken
Monday, 29 May, 2023   (more nearby)
Submitted
Tuesday, 30 May, 2023
Geographical Context
Coastal  Historic sites and artefacts  Uplands 
Primary Subject of Photo
Trig Point 
Subject Location
Irish: geotagged! D 11517 36392 [1m precision]
WGS84: 55:9.7268N 6:15.0628W
Camera Location
Irish: geotagged! D 1151 3638
View Direction
North-northeast (about 22 degrees)
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Image Type (about): geograph  (Third Visitor for D1136) · First in 5 Years (TPoint) (about)
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