J0826 : Flush Bracket, Newry

taken 4 years ago, near to An Tiur, Northern Ireland

Flush Bracket, Newry
Flush Bracket, Newry
Flush bracket bench mark on the southern wall of Newry First Presbyterian Church (Non-Subscribing) J0826 : Newry's First Presbyterian (Non-subscribing) Church on the corner of John Mitchel Place and William Street in the city.
The number on the bracket is OSBM 5004.
The mark has been levelled to 4.41 metres above MSL.

J3968 : The Gransha Road, Marylands crossroads describes the location of the first flush bracket used in Northern Ireland and this is the last, numerically. It is also something of an oddity - all other brackets used were in distinct groups from 1001-25, 2001-2100 and 3000-3599, prefixed by OSNIBM or OSBM. At the very end of the list are OSBM 5003 & 5004, both sited in Newry (5003 is probably at LinkExternal link ). 5004 does not appear on the 1970s 1:10,000 maps but does on those of c2007, leading me to think that it, and 5003, were created much later than the rest for some reason.
Bench Mark
Bench marks were historically used to record the height above sea level of a location as surveyed against the Mean Sea Level data (taken at Clarendon Dock, Belfast, for Northern Ireland data, Newlyn in Cornwall for data in Great Britain and Portmoor Pier, Malin Head, for data relating to the Republic of Ireland). They were used as part of a greater surveying network by the UK Ordnance Survey, Ordnance Survey Northern Ireland (OSNI) and the Ordnance Survey Ireland (OSI). If the exact height of one bench mark is known then the exact height of the next can be found by measuring the difference in heights, through a process of spirit levelling. In this way hundreds of thousands of bench marks were sited all around the UK & Ireland from the mid 19th to late 20th centuries. There are several distinct types of bench mark:

- Fundamental bench marks have been constructed at selected sites where foundations can be set on stable strata such as bedrock. Each FBM consists of a buried chamber with a brass bolt set in the top of a granite pillar. See NG8825 : Dornie fundamental bench mark for an example. FBMs were used in Ireland as well as GB but those in Ireland do not have any surface markers, nor are they marked on standard maps.
- Flush brackets consist of metal plates about 90 mm wide and 175 mm long. Each bracket has a unique serial number. They are most commonly found on most Triangulation Pillars, some churches or on other important civic buildings. See J3270 : Flush Bracket, Belfast for an example.
- Cut bench marks are the commonest form of mark. They consist of a horizontal bar cut into a wall or brickwork and are found just about anywhere. A broad arrow is cut immediately below the centre of the horizontal bar. See J3372 : Bench Mark, Belfast for an example. The horizontal mark may be replaced by or contain a bolt - see J1486 : Bench Mark, Antrim.
Other marks include:
- Projecting bench marks such as SD8072 : Projecting Bracket Benchmark on St Oswald's Tower
- Bolt bench marks such as SJ1888 : OSBM bolt on Hilbre Island
- Rivet bench marks such as J3978 : Bench Mark, Holywood
- Pivot bench marks such as SJ2661 : Pivot bench mark on Leeswood Bridge

Bench marks are commonly found on older buildings or other semi-permanent features such as stone bridges or walls. Due to updated mapping techniques and technological advances such as GPS, bench marks are no longer maintained. Many are still in existence and the markers will probably remain until they are eventually destroyed by redevelopment or erosion.
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J0826, 698 images   (more nearby )
Photographer
  (find more nearby)
Date Taken
Wednesday, 4 December, 2013   (more nearby)
Submitted
Sunday, 8 December, 2013
Geographical Context
Historic sites and artefacts  Religious sites  City, Town centre 
Place (from Tags)
Newry 
Subject Location
Irish: geotagged! J 08655 26034 [1m precision]
WGS84: 54:10.3099N 6:20.2159W
Camera Location
Irish: geotagged! J 08655 26034
View Direction
EAST (about 90 degrees)
Clickable map
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Other Tags
Bench Mark  Ordnance Survey Bench Mark  OSNI  Newry  OS Flush Bracket  Flush Bracket  O.S. Benchmark  Flush Bracket Benchmark 

Click a tag, to view other nearby images.

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