SN4020 : Ordnance Survey Benchmark and Bolt - Carmarthen, St. David's Church

taken 4 years ago, near to Carmarthen/Caerfyrddin, Carmarthenshire/Sir Gaerfyrddin, Great Britain

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

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: LinkExternal link [OS 54/753]

Context: SN4020 : Ordnance Survey Benchmark and Bolt - Carmarthen, St. David's Church
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SN4020, 121 images   (more nearby )
Photographer
  (find more nearby)
Date Taken
Tuesday, 8 October, 2013   (more nearby)
Submitted
Friday, 11 October, 2013
Geographical Context
Historic sites and artefacts  Religious sites  City, Town centre 
Primary Subject of Photo
Benchmark 
Image Buckets ?
Closeup  Informative 
Subject Location
OSGB36: geotagged! SN 4055 2009 [10m precision]
WGS84: 51:51.3934N 4:19.0036W
Camera Location
OSGB36: geotagged! SN 4055 2009
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NORTH (about 0 degrees)
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Other Tags
OS  BM  PA Bolt  Benchmark  1st Order  Church  1GL  3GL  G075  G 64 

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