SK8174 : Bench mark, St Oswald's Church, Dunham on Trent

taken 4 years ago, near to Dunham on Trent, Nottinghamshire, Great Britain

Bench mark, St Oswald's Church, Dunham on Trent
Bench mark, St Oswald's Church, Dunham on Trent
See LinkExternal link for location.
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.
Church of St Oswald, Dunham on Trent
This consists of a 19th century nave and chancel attached to the remaining 15th century tower of the medieval church. The church was made redundant in 2011 and is showing signs of dilapidation. At the time of my visit the nave and chancel were roped off as slates were loose on the roof, re were signs indicating that the temporary barrier was due for imminent replacement by a 6 ft security fence. The future of the church is clearly at risk.

The most prominent feature of the church is the 15th century tower in Perpendicular style with its exceptionally large and ornately traceried bell-chamber openings. The body of the church was first rebuilt in the late 18th century following severe flooding, and then almost completely rebuilt in 1862 by the Nottingham architect T C Hine. Parts of the 18th century fabric remain in the south wall of the nave, The Victorian church is essentially in Decorated style.

The interior is a typical Victorian Gothic revival unity.

For more information about the church see the Southwell & Nottingham Church History Project LinkExternal link Listed Grade I.
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SK8174, 170 images   (more nearby )
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Date Taken
Friday, 22 August, 2014   (more nearby)
Thursday, 28 August, 2014
Geographical Context
Construction, Development 
Building Material (from Tags)
Primary Subject of Photo
Subject Location
OSGB36: geotagged! SK 8149 7449 [10m precision]
WGS84: 53:15.6697N 0:46.7890W
Camera Location
OSGB36: geotagged! SK 8149 7449
View Direction
SOUTH (about 180 degrees)
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Bench Mark 

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