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

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

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

Image: © N Scott Taken: 8 Oct 2013

Ordnance Survey Benchmark (OSBM) used for levelling height above Ordnance Datum (OD). Height (1954): 26.9023m OD (Newlyn). Mark verified by the Ordnance Survey in 1976. Description: PA BOLT W SIDE ENT ST DAVIDS CH S FACE. 0.6m above ground. 1st Order BM. The bolt was used on the Llanstephan to Dolfor Toll-house line of the First Primary Levelling of England & Wales in 1856-1857. It was levelled with a height of 88.597' above OD (Liverpool). Description: 18. Bolt in South side of St. David's Church Tower, Caermarthen ; 2.36 ft. above surface. Page 576 of the abstract: http://www.bench-marks.org.uk/ew1gl/1GLA_576.png The bolt was included on the Carmarthen to Haverford West line (G075) of the Third Geodetic Levelling of England & Wales in 1954. Abstract G 64: http://discovery.nationalarchives.gov.uk/SearchUI/details?Uri=C11264472 [OS 54/753] Context: Image

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