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OSBM Bolt 
OSBM Bolt on living rock, 14' W from W side of road, Bradfield [3GL].
Location
Grid reference: SK 2460 9311.
Landranger 110: Sheffield & Huddersfield, Glossop & Holmfirth.
Structure: Rock outcrop.
Waypoint: OS0030.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Broomhead Moor,
1.54km to the north.
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 living rock, 14' W from W side of road, Bradfield.
Location
Grid reference: SK 2460 9311.
Landranger 110: Sheffield & Huddersfield, Glossop & Holmfirth.
Structure: Rock outcrop.
Waypoint: OS0030.
Neighbouring Flush Brackets
| 642 | Thornseat Lodge 990.20m to the southwest. |
| 643 | Mortimer House 1.17km to the north. |
| S9090 | High Bradfield, Church 2.17km to the east. |
| 641 | Strines Inn 3.42km to the southwest. |
| S9091 | Oughtibridge, Cemetery 5.51km 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 living rock, 14' W from W side of road, Bradfield.
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