OSNI Triangulation Stations :: Shared Description

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.
by Rossographer
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153 images use this description. Preview sample shown below:

H1228 : Cuilcagh Triangulation Pillar by Rossographer
J5536 : Isabella's Tower, Ardglass by Rossographer
J2017 : Slieve Martin Triangulation Pillar by Rossographer
J4793 : Centre Mark, Muldersleigh Triangulation Pillar by Rossographer
J1046 : Spider, Listullyard Fort Triangulation Pillar by Rossographer
J3145 : Slieve Croob Triangulation Pillar by Rossographer
J3078 : Squires Hill Triangulation Pillar by Rossographer
J3371 : Divis Triangulation Pillar by Rossographer
J2875 : Flush Bracket, Divis Triangulation Pillar by Rossographer
J2873 : Spider, Black Mountain South Triangulation Pillar by Rossographer
J2482 : Spider, Lyles Hill Triangulation Pillar by Rossographer
J5985 : Lighthouse Island Triangulation Station by © N McKee
J3527 : Flush Bracket, Slieve Donard Triangulation Pillar by Rossographer
D1723 : Flush Bracket, Trostan Triangulation Pillar by Rossographer
H9634 : King's Ring Triangulation Pillar by Rossographer
C8938 : Spider, Scudion Craig Triangulation Pillar by Rossographer
J3971 : Flush Bracket, Braniel Hill Triangulation Pillar by Rossographer
D0002 : Tully Triangulation Pillar by Rossographer
J2873 : Black Mountain South Triangulation Pillar by Rossographer
J5985 : Lighthouse Island Triangulation Station by ©N McKee
H9634 : Spider, King's Ring Triangulation Pillar by Rossographer
J4075 : Spider, Craigantlet Triangulation Pillar by Rossographer
J2670 : Collin Triangulation Pillar by Rossographer
J6248 : Tara Fort Triangulation Pillar by Rossographer
J4738 : The Mournes from Scollogs by Rossographer

... and 128 more images.

These Shared Descriptions are common to multiple images. For example, you can create a generic description for an object shown in a photo, and reuse the description on all photos of the object. All descriptions are public and shared between contributors, i.e. you can reuse a description created by others, just as they can use yours.
Created: Fri, 3 Jun 2011, Updated: Thu, 12 Jan 2012

The 'Shared Description' text on this page is Copyright 2011 Rossographer, however it is specifically licensed so that contributors can reuse it on their own images without restriction.

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