1GL Bolt: Reading, Prison   

Reading County Gaol. Bolt in West tower at main entrance; 2.15 ft. above surface [1GL, Basingstoke to Coventry, Branch Levelling from Mark No. 38(h)]; Bolt in N. face of H.M. Prison [2GL] =?= CUT MARK: WALL HM PRISON W SIDE ENT S SIDE FORBURY RD (height 43.0300m, 0.6m above ground).

Location
Grid reference: SU 7205 7361.
Landranger 175: Reading & Windsor, Henley-on-Thames & Bracknell.
Structure: Public building.
Waypoint: BT0552.

Neighbouring Bench Marks

BM	Reading, Abbots Walk 177.20m to the west.
BM	Reading, Cannon Inn 254.95m to the southwest.
BM	Reading, Forbury Gardens NW 286.36m to the west.
BOLT	Reading, St. Laurence's Church 321.04m to the west.
BM	Reading, St. Laurence's Church 327.57m to the west.

The nearest fundamental bench mark is Wallingford, 17.43km to the northwest.

First Primary Levelling, England & Wales (1840-60)
This bench mark was used during the First primary levelling, England & Wales, and was levelled with a height of 141.8460 feet [43.2347 metres] above mean sea level (Liverpool datum). It was included as a side level on the Basingstoke to Coventry levelling line. The surveyor's description was Reading County Gaol. Bolt in West tower at main entrance; 2.15 ft. above surface.

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 141.1600 feet [43.0256 metres] above mean sea level (Newlyn datum). It was included as a side level on the Basingstoke to Wallingford levelling line. The surveyor's description was Bolt in N. face of H.M. Prison.

Logged Visits
Logged on 15th October 2008 by RogerTempleman. Condition: Probably destroyed.
The prison site is now surrounded by a new-looking wall. Suspect all bench marks are destroyed unless they are within the present walls.