SH7877 : 1GL benchmark & bolt on castle tower, Conwy

taken 7 years ago, near to Gyffin, Conwy, Great Britain

1GL benchmark & bolt on castle tower, Conwy
1GL benchmark & bolt on castle tower, Conwy
This 1GL benchmark & bolt located on one of the towers of Conwy castle was used during the Ordnance Survey's First Primary Levelling on the line between Warrington and Pembroke Docks, between September 1851 and July 1852. This was mark No. 234 along this levelling line and was 30.9410ft above the Liverpool datum. The Ordnance Survey database shows that this mark was last inspected in 1969.
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SH7877, 1693 images   (more nearby )
Photographer
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Date Taken
Wednesday, 31 August, 2011   (more nearby)
Submitted
Saturday, 10 September, 2011
Category
Bench Mark   (more nearby)
Subject Location
OSGB36: geotagged! SH 7843 7746 [10m precision]
WGS84: 53:16.8080N 3:49.4886W
Camera Location
OSGB36: geotagged! SH 7843 7746
View Direction
WEST (about 270 degrees)
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