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Flush Bracket OSBM G1692: Greenwich, Royal Observatory   

E face, NE angle of gatehouse, Royal Observatory [2GL+] [TQ5]; pillar of wall, N side of entrance, Royal Observatory, E face, 0.2m from NE angle - FB is on perimeter wall of Observatory, next to prime meridian marker.

Location
Grid reference: TQ 3888 7733.
Landranger 177: East London, Billericay & Gravesend.
Explorer 161: London South.
Explorer 162: Greenwich & Gravesend.
Structure: Other.
Waypoint: FG1692.

Neighbouring Flush Brackets
S0646 Greenwich, Royal Observatory 22.36m to the northwest.
L10 Blackheath Hill, Holy Trinity Church 937.23m to the southwest.
G1691 Vanbrugh Hill 1.04km to the northeast.
L9 Lewisham Road 1.22km to the southwest.
G1690 Greenwich, Riverway School 1.25km to the northeast.
The nearest fundamental bench mark is Croydon, 17.93km to the south.

Second Geodetic Levelling, England & Wales (1946-51)
This flush bracket was used during the Second geodetic levelling, England & Wales, and was levelled with a height of 151.6460 feet [46.2217 metres] above mean sea level (Newlyn datum). The surveyor's description was E face, NE angle of gatehouse, Royal Observatory.

Logged Visits
Visited on 19th July 2015 by wrose. Grid reference: TQ 38892 77342. Condition: Good.
In the park capturing some Munzee's!! so just had to come and have a look for this one. Nothing really to add other than to confirm that it is still at the location previously described and in excellent condition.
http://www.geograph.org.uk/photo/4588257

Visited on 29th April 2015 by dave41. Condition: Good.
As per all previous remarks.

Visited on 22nd June 2014 by pkbathrooms. Grid reference: TQ 3888 7733. Condition: Good.
flush bracket and trigs bagged

Visited on 5th June 2014 by cjo. Condition: Good.
together with display of standard lengths

Visited on 19th April 2014 by Brisey. Condition: Good.
The easy part of this log is recording the sighting of the FB, the hard part is making sense of the 154.70 feet above Newlyn datum shown on a nearby plate. I think this was the height of S0646 which has been projected from its different position to this plate on the wall and has nothing to do with G1692. Information in this record states 151.6460 ft ODN, but the OS database states 46.306m (151.92 ft) for G1692, a small discrepancy but clearly not 154.7. Old Maps 1:2500 1951-53 shows 151.89 (I think) for a BM symbol at the relevant position.

Visited on 12th March 2014 by Bluewhitereg. Condition: Good.
Great bench mark to visit.

Visited on 20th August 2013 by superswifteagle. Condition: Good.
Much of interest here! An explanatory plaque stating the FB bears the legend "G 1692" - technically mistaken since there is no space, and stating it dates from the 1940s. Also a height plaque above it giving height of 154.70 Ft above "Mean Sea Level at Newlyn" which seems correct in view of the FB height. Also two grooves crudely cut in either edge of the FB at arrow height. I wonder if this FB has always been in this position, or whether it has been moved to become part of the exhibit!

Visited on 3rd April 2012 by Oakwarden. Condition: Good.
easy to find. in good condition next to some standard measures set into the wall

Visited on 20th November 2011 by TrigAngel. Condition: Good.
My first G bracket

Visited on 11th September 2011 by asteroth. Grid reference: TQ 3888 7733. Condition: Good.
Easily viewed without paying the £7 entrance fee (Which is well worth the money). Top of the hill turn right and it's to the right under the clock next to the linear measurements. There is a notice explaining its function. Good view of docklands and recent London landmarks.
Try checking your Sat Nav on the Prime Meridian and you won't get the reading you expected!!!

Visited on 9th July 2011 by cassandy. Grid reference: TQ 3888 7733. Condition: Good.
Didn't even realise this was there, just found by chance when visiting so a nice surprise to see it there.

Visited on 23rd May 2010 by jochta. Condition: Good.
Took me two walks around the observatory to find it as the OS description is a bit rubbish. It's actually below the big clock at the entrance at the top of the steps next to the standard measures. http://maps.jochta.com/benchmarks.php?id=473

Visited on 25th April 2009 by MogwaiLiz. Condition: Good.
Another BM preserved in good condition.

Visited on 19th October 2008 by surveyor1. Grid reference: TQ 3888 7733. Condition: Good.
Spotted this FB G1692 when visiting the Royal Observatory at Greenwich. A place well a visit.

Visited on 6th June 2005 by iangr2004. Condition: Good.

Visited on 30th January 1996 by Calico. Condition: Good.

Visited on unknown date by mystic189. Condition: Unknown.
If you have any corrections or additions to this record, please let us know.
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