Ordnance Survey Benchmark and Bolt - Llanarth, St. David's Church

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The photograph on this page of Ordnance Survey Benchmark and Bolt - Llanarth, St. David's Church by N Scott as part of the Geograph project.

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Ordnance Survey Benchmark and Bolt - Llanarth, St. David's Church

Image: © N Scott Taken: 21 Mar 2016

Ordnance Survey Benchmark (OSBM) used for levelling height above Ordnance Datum (OD). Height (1975): 131.8946m OD. Mark verified by the Ordnance Survey in 1975. Description: PA BOLT ST DAVIDS CH W FACE 2.8M SW ANG. 0.3m above ground. 3rd Order BM. The bolt was included as a branch level from mark 683 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 432.622' above OD (Liverpool). Description: Llanarth Church. Bolt in West side of tower ; 1.51 ft. above surface. Page 535 of the abstract: http://www.trigtools.co.uk/data/1GL/1GLA_535.png Close-up: Image

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