J5536 : Isabella's Tower, Ardglass

taken 4 years ago, near to Ardglass, Co Down, Northern Ireland

Isabella's Tower, Ardglass
Isabella's Tower, Ardglass
Isabella's Tower on a hill on the southern edge of Ardglass. This is the view from Killough. See also J5536 : Ward Close and Isabella's Tower.

The tower was also used as a triangulation station by OSNI and is one of only two stations not marked by a triangulation pillar. I suspect there is a bolt/rivet somewhere near the top.
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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J5536, 19 images   (more nearby search)
Photographer
Date Taken
Sunday, 23 August, 2020   (more nearby)
Submitted
Tuesday, 25 August, 2020
Geographical Context
Coastal  Historic sites and artefacts 
Primary Subject of Photo
Folly 
Building Type (from Tags)
Folly 
Subject Location
Irish: geotagged! J 556 369 [100m precision]
WGS84: 54:15.4647N 5:36.7806W
Camera Location
Irish: geotagged! J 540 355
View Direction
Northeast (about 45 degrees)
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Other Tags
OSNI  Triangulation Point  Ardglass  Triangulation Station  Tower  Folly 

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Image Type (about): cross grid 
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