SN4120 : Ordnance Survey Benchmark and Bolt - Carmarthen, Guildhall

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

Ordnance Survey Benchmark and Bolt - Carmarthen, Guildhall
Ordnance Survey Benchmark and Bolt - Carmarthen, Guildhall
Ordnance Survey Benchmark (OSBM) used for levelling height above Ordnance Datum (OD).
Height: 17.3300m OD (Newlyn). Mark verified by the Ordnance Survey in 1953. Description: NBM BLDG N ANG GUILDHALL SW SIDE HALL ST. 0.4m above ground. 3rd 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 57.189' above OD (Liverpool). Description: 21. Bolt in North-west corner and front of the Town Hall ; 1.31 ft. above surface. Page 576 of the abstract: LinkExternal link

Close-up: SN4120 : Ordnance Survey Benchmark and Bolt - Carmarthen, Guildhall
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SN4120, 290 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  Public buildings and spaces  City, Town centre 
Primary Subject of Photo
Benchmark 
Image Buckets ?
Wideangle  Informative 
Subject Location
OSGB36: geotagged! SN 4120 2003 [10m precision]
WGS84: 51:51.3722N 4:18.4361W
Camera Location
OSGB36: geotagged! SN 4120 2003
View Direction
Southeast (about 135 degrees)
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Other Tags
OS  BM  PA Bolt  Benchmark  3rd Order  Town Hall  1GL  Cut Mark  NBM 

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