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OSBM Bolt: by Perry Farm 
Bolt in W. end of granite block, Professor Whewell's Point, N.N.W. of Perry Farm and about 1½ miles W of East Quantockshead [2GL] - tentative location; probably not actually an "OSBM" Bolt, nor a "1GL" Bolt.
Location
Grid reference: ST 1156 4352.
Landranger 181: Minehead & Brendon Hills, Dulverton & Tiverton.
Structure: Other.
Waypoint: OS0003.
Neighbouring Flush Brackets
The nearest fundamental bench mark is North Petherton,
19.79km to the southeast.
Second Geodetic Levelling, England & Wales (1912-21)
This bench mark was used during the Second geodetic levelling, England & Wales, and was levelled with a height of 171.9470 feet [52.4094 metres] above mean sea level (Newlyn datum). It was included on the North Petherton to Flax Bourton (Axmouth to Perry Farm Branch) levelling line. The surveyor's description was Bolt in W. end of granite block, Professor Whewell's Point, N.N.W. of Perry Farm and about 1½ miles W of East Quantockshead.
Location
Grid reference: ST 1156 4352.
Landranger 181: Minehead & Brendon Hills, Dulverton & Tiverton.
Structure: Other.
Waypoint: OS0003.
Neighbouring Flush Brackets
| G4831 | Fairfield Lodge 951.31m to the south. |
| G4830 | West Wood 1.89km to the southwest. |
| 1623 | Higher Street, Cobblers Cottage 1.91km to the east. |
| 1622 | Winrush, School 2.72km to the east. |
| G4829 | Doniford Farm 2.85km to the west. |
Second Geodetic Levelling, England & Wales (1912-21)
This bench mark was used during the Second geodetic levelling, England & Wales, and was levelled with a height of 171.9470 feet [52.4094 metres] above mean sea level (Newlyn datum). It was included on the North Petherton to Flax Bourton (Axmouth to Perry Farm Branch) levelling line. The surveyor's description was Bolt in W. end of granite block, Professor Whewell's Point, N.N.W. of Perry Farm and about 1½ miles W of East Quantockshead.
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