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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120 images use this description. Preview sample shown below:

J4179 : Flush Bracket, Ballycultra Triangulation Pillar by Rossographer
C6734 : North Base Station, Lough Foyle Base Line by Rossographer
J2824 : Slieve Muck Triangulation Pillar by Rossographer
J3771 : Spider, Casaeldona Triangulation Pillar by Rossographer
J3527 : The Mourne Wall, Slieve Donard by Rossographer
J2056 : Fort Hill Triangulation Pillar by Rossographer
J2873 : Flush Bracket, Black Mountain South Triangulation Pillar by Rossographer
J2974 : Spider, Black Mountain North Triangulation Pillar by Rossographer
J2875 : Spider, Divis Triangulation Pillar by Rossographer
D4500 : Flush Bracket, Whitish Hill Triangulation Pillar by Rossographer
J3371 : Flush Bracket, Divis Triangulation Pillar by Rossographer
J4793 : Spider, Muldersleigh Triangulation Pillar by Rossographer
J5161 : Flush Bracket, Killinakin Triangulation Pillar by Rossographer
J4177 : Standard Hill Triangulation Pillar by Rossographer
H1228 : Spider, Cuilcagh Triangulation Pillar by Rossographer
J4075 : Craigantlet Triangulation Pillar by Rossographer
J1046 : Listullyard Fort Triangulation Pillar by Rossographer
J4665 : Drumhirk Triangulation Pillar by Rossographer
H1228 : Cuilcagh Triangulation Pillar by Rossographer
J1779 : Killead Triangulation Pillar by Rossographer
J3145 : Slieve Croob Triangulation Pillar by Rossographer
J4177 : Spider, Standard Hill Triangulation Pillar by Rossographer
J5161 : Spider, Killinakin Triangulation Pillar by Rossographer
J1779 : Spider, Killead Triangulation Pillar by Rossographer
J3337 : Slievenaslat Triangulation Pillar by Rossographer

... and 95 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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