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pdtempan
2008-06-04 15:51:33
Bench marks
Hello John. This looks like a bench mark, though I would expect the arrow to point to a horizontal line (the "bench") and to be marked on a vertical surface. Apparently there are horizontal bench marks too, but whether your object is one of these, I am not sure. If it is a bench mark, it should be indicated on more OS detailed maps such as the 1:10,000 and 6" to the mile series (you should be able to access these at your local library). I haven't found much on the OSI site about bench marks as they are now largely part of mapping history rather than current surveying technology, but the OS site for Britain has some useful info on them and I'm sure much of it applies to the Irish network too. Basically it explains that Ordnance Survey Bench marks (BMs) are survey marks made by the OS to record height above sea-level. 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. Bench marks are usually found on buildings or other semi-permanent features. Although the OS is no longer updating the main network, their policy is still to keep a record of locations and the markers will remain until they are eventually destroyed by redevelopment or erosion. There is more information available here: http://benchmarks.ordnancesurvey.co.uk/pls/htmldb/f?p=111:3:16146039039280374334::NO:3:: There is also a whole world of bench mark visiting and recording, about which you can find out more here: http://www.bench-marks.org.uk/ if the urge takes you! (I hesitate to make any comparisons with trainspotting, as I'm sure my own fascination for mountain names is distinctly underwhelming to some.) As regards the significance of the symbol, I don't think the "arrows" have a directional significance. They usually point up on buildings or triangulation pillars, and the arrow points to the middle of the horizontal bar, as the recorded height refers to this bar. I presume that the symbol originally represented a tripod, on which one would set a theodolite to carry out surveying measurements, but maybe somebody with more knowledge of cartography than me could confirm or correct this.
I took this photo .. by john_desmond   (Show all posts)
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RECENT CONTRIBUTIONS 1 2 3 .. 22 Next page >>
Track
Carrauntoohil via the 'Back Ladder' from the Bridia Valley
peter1 less than an hour ago.
Park at a small turning place, just opposite The Stepping Stone / Cooky Monsters accommodation and cafe.The route fol... walk, Len: 11.5km, Climb: 1097m, Area: Carrauntoohil, MacGillycuddy's Reeks (I

  
Track
Croghan Kinsella & Tops
Peter Walker 3 hours ago.
walk, Len: 9.6km, Climb: 411m, Area: Croghan Kinsella, Dublin/Wicklow (Ireland)...

  
Track
Corrigasleggaun and Slieve Maan
Peter Walker 13 hours ago.
walk, Len: 17.8km, Climb: 541m, Area: Dublin/Wicklow (Ireland) Corrigasleggaun,...

Summit Comment
Binn Bhriocáin: Long views of a stepped descent.
simon3 a day ago.
Letterbreckaun can be seen from Clare island, around 33km away. It appears between Mweelrea and the high ground towards the Sheefrys.

  
Summit Comment
Mweelrea: Coastal mountains
simon3 a day ago.
Ben Bury and Mweelrea form an impressive sight from Clare Island.

  
Summit Comment
Caherbarnagh East Top: An unremarkable summit, worth the visit for the views.
David-Guenot 4 days ago.
The summit is unremarkable though easy to spot as it lies along the fence.

Track
High tour of Clare Island
simon3 2 days ago.
There are various ways of visiting Clare Island. We opted for a route that took us to the two main summits which also ... walk, Len: 15.0km, Climb: 622m, Area: Knocknaveen, Achill/Corraun (Ireland) K

  
Summit Comment
Caherbarnagh East Top: An easy stroll from Caherbarnagh.
David-Guenot 4 days ago.
There is a gate to cross when coming down from the cairn at the NE end of the main Caherbarnagh ridge (I found it was actually easier to cross the fence just right of the gate). There is a faint t...

  
Track
Glencullin ridge to Ben Bury/Mweelrea
markwallace 3 days ago.
This route was suggested by the Grade 1 scramble up the Glencullin Ridge described in Alan Tees? Scrambles in Ulster ... walk, Len: 16.5km, Climb: 1097m, Area: Ben Bury, Mweelrea Mountains (Ireland)

Summit Comment
Caherbarnagh East Top: A worthwhile addition.
David-Guenot 4 days ago.
This summit is easily reached from the main Caherbarnagh ridge and seems easy enough to get to from Curracahill as well. If coming from Caherbarnagh, best is to cross the fence just before the col...

  
Track
Dart & Sawel
Peter Walker 5 days ago.
(Note: the time is bonkers, and the ascent isn't right either, but hey, at least the distance is correct. And it ende... walk, Len: 16.3km, Climb: 635m, Area: Dart Mountain, Sperrin Mountains (Irelan

  
Summit Comment
The Paps East: Two shapely hills.
TommyV a week ago.
There is a forestry road in the Clydagh Valley with parking at W12955 83343. Following this road will lead you out onto the open mountain. From here it's a steep pull up to spot height 562 metres ...


RECENT CONTRIBUTIONS 1 2 3 .. 22 Next page >>