2010
SN4120 : Bench Mark, Guildhall, Carmarthen
taken 14 years ago, near to Carmarthen/Caerfyrddin, Carmarthenshire/Sir Gaerfyrddin, Wales
Bench Mark, Guildhall, Carmarthen
The bench mark with a bolt to the side is set into the north wall of the building. For a view of the building
Link and for further information on the bench mark
Link
A bench mark is an Ordnance Survey arrowhead sign found on walls, bridges, churches and specially erected triangulation pillars where the altitude above sea-level has been accurately measured by surveyors. The arrowhead points to a horizontal line above it which marks the exact altitude.
With rivets and pivots there is no datum (horizontal line) cut, the pointed-to horizontal surface defining the datum height.
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