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OSBM Bolt 
OSBM Bolt on top of wall at NW angle of transformer station, S side of road [3GL].
Location
Grid reference: SN 4990 0130.
Landranger 159: Swansea & Gower, Carmarthen.
Structure: Roadside wall.
Waypoint: OS0769.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Bishopston,
14.15km to the southeast.
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Bishopston to Carmarthen levelling line. The surveyor's description was OSBM Bolt on top of wall at NW angle of transformer station, S side of road.
Location
Grid reference: SN 4990 0130.
Landranger 159: Swansea & Gower, Carmarthen.
Structure: Roadside wall.
Waypoint: OS0769.
Neighbouring Flush Brackets
| S1147 | Llanelli, Library 1.09km to the southeast. |
| S1148 | Llanelli, Thomas Street 1.12km to the southeast. |
| G3828 | Cwmbach 1.33km to the northwest. |
| G3827 | Llanelli, Havard Road 2.52km to the east. |
| G3829 | Pant-y-llyn 3.00km to the northwest. |
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Bishopston to Carmarthen levelling line. The surveyor's description was OSBM Bolt on top of wall at NW angle of transformer station, S side of road.
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