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Hemel Hempstead Fundamental Bench Mark   


Location
Grid reference: TL 0660 0945.
Landranger 166: Luton & Hertford, Hitchin & St Albans.
Explorer 182: St Albans & Hatfield.
GPS network passive station: H1TL0609.
Waypoint: FM7243.

Neighbouring Flush Brackets
663 Hemel Hempstead, Cupid Green 588.73m to the east.
1270 Woodhall 1.02km to the east.
664 Hemel Hempstead, High Street 1.27km to the southeast.
S8273 Piccott's End, Marchmont Farm 1.49km to the southwest.
843 Hemel Hempstead 1.78km to the southwest.
The nearest fundamental bench mark is Windsor Castle, 33.79km to the south.

Second Geodetic Levelling, England & Wales (1912-21)
This fundamental bench mark was used during the Second geodetic levelling, England & Wales, and was levelled with a height of 474.3100 feet [144.5697 metres] above mean sea level (Newlyn datum). It was included on the Great Linford to Hemel Hempstead, Hemel Hempstead to Buntingford and Hemel Hempstead to Windsor Castle levelling lines.

Third Geodetic Levelling, England & Wales (1950-68)
This fundamental bench mark was used during the Third geodetic levelling, England & Wales, and was levelled with a height of 474.3100 feet [144.5697 metres] above mean sea level (Newlyn datum). It was included on the Great Linford to Hemel Hempstead and Hemel Hempstead to Wallingford levelling lines.

Logged Visits
Visited on 6th March 2017 by Dugswell2. Grid reference: TL 0660 0945. Condition: Good.
FBM in rusty playpen beside bin and under tree. FBM is granite with bolt on top. I got a bit dizzy driving around all the roundabouts near here.

Visited on 8th July 2016 by Orlandos_Rat. Grid reference: TL 0660 0945. Condition: Good.
Quick find on housing estate.

Visited on 15th November 2015 by mickandkim. Grid reference: TL 0660 0945. Condition: Good.
In good order

Visited on 14th December 2014 by ChrisC. Condition: Good.
Undergrowth under control in winter.

Visited on 15th June 2013 by FRI. Grid reference: TL 0660 0945. Condition: Good.
well protected by green painted railings undergrowth been cut back since last visit to expose FBM brass dome head rivet on short concrete base, cannot see if cover within fence contains further levels as described by OS? FBM is now used for checking the GPS network locating system .

Visited on 2nd March 2010 by Calico. Condition: Good.

Visited on 21st June 2009 by Griefmiester. Condition: Good.
Standard playpen - very overgrown - uninteresting location.
If you have any corrections or additions to this record, please let us know.
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