Ordnance Survey Benchmark and Bolt - Llanon, Pont Llanon
Introduction
The photograph on this page of Ordnance Survey Benchmark and Bolt - Llanon, Pont Llanon by N Scott as part of the Geograph project.
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Ordnance Survey Benchmark and Bolt - Llanon, Pont Llanon
Image: © N Scott Taken: 17 Jul 2013
Ordnance Survey Benchmark (OSBM) used for levelling height above Ordnance Datum (OD). Height: 24.6644m OD (Newlyn). Mark verified by the Ordnance Survey in 1977. Description: PARA BR PONTLLANON W SIDE RD C R. 0.4m above ground. 3rd Order BM. The bolt was used on the Warrington to Pembroke Docks line of the First Primary Levelling of England & Wales in 1851-1852. It was levelled with a height of 80.970' above OD (Liverpool). Description: 648. Bolt in W. battlement of bridge, at S. end of Llanon village ; 1.45 ft. below top of battlement. Page 534 of the abstract: http://www.trigtools.co.uk/data/1GL/1GLA_534.png
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Image Location
Latitude
52.278755
Longitude
-4.179483