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OSBM Bolt 
OSBM Bolt on boulder, NE side of road, 3' NE from junction of walls, Bradfield [3GL].
Location
Grid reference: SK 2300 9125.
Landranger 110: Sheffield & Huddersfield, Glossop & Holmfirth.
Structure: Boulder.
Waypoint: OS0031.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Broomhead Moor,
3.73km to the northeast.
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Broomhead Moor to Matlock levelling line. The surveyor's description was OSBM Bolt on boulder, NE side of road, 3' NE from junction of walls, Bradfield.
Location
Grid reference: SK 2300 9125.
Landranger 110: Sheffield & Huddersfield, Glossop & Holmfirth.
Structure: Boulder.
Waypoint: OS0031.
Neighbouring Flush Brackets
| 641 | Strines Inn 970.82m to the southwest. |
| 642 | Thornseat Lodge 1.47km to the northeast. |
| G2300 | Moscar 3.43km to the south. |
| 643 | Mortimer House 3.45km to the northeast. |
| S9090 | High Bradfield, Church 3.91km to the east. |
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Broomhead Moor to Matlock levelling line. The surveyor's description was OSBM Bolt on boulder, NE side of road, 3' NE from junction of walls, Bradfield.
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