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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.


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Summit Comment
Slieve Foye: Not bad.
shanks 3 hours ago.
Excellent if introduceing new walkers reasonably well signed but was a little overgrown in spots and path really close to wire fencing at others. Apart from that ☺

  
Track
Wicklow Coastal Walk
Onzy 23 hours ago.
Route from Pennycomelately Bridge to Brittas Bay.Not to be taken lightly - the stretch around Mizen Head is blocked by f walk, Len: 9.2km, Climb: 104m, Area: Dublin/Wicklow (Ireland)

  
Track
La Gomera- Unfinished Business - GR132
GSheehy 2 days ago.
Maybe the height gain above is correct. Maybe it just felt like one of the hardest things you?ve done. Maybe the cumul walk, Len: 56.3km, Climb: 3018m, Area: Spain, Canary Islands ()

Summit Comment
Knockardakin: Bag it as part of the cliff walk
TommyV 3 days ago.
I technically haven't bagged the summit of this hill as it wasn't listed on MV when I did the Ciiffs of Moher walk, but it would be a very small detour to bag it. I was no more than 50 meters from...

  
Summit Comment
Clifden Hill: Didn't bag it
TommyV 3 days ago.
I drove as far as the point mentioned by Jamessheerin. Nice views over Lough Inchiquin, the drive trhough the trees only add about ten mentres of elevation and lots of briars so I got back in my c...

  
Summit Comment
Cloontohil: My nearest MV hill
TommyV 3 days ago.
This hill is only a few kilometers over the road from my home house. However without Mountain Views website you would scarcely know it's a hill as it is situated in an area of high ground anyway s...

Summit Comment
Ben Dash: One of my earlier attempts
TommyV 3 days ago.
Ben Dash was one of my earlier attempts at hill bagging, back in the days when I had no gps and didn't believe I needed a map. I went through some bog that people had bagged turf on before I found...

  
Forum: General
The Annapurna Circuit
Colin Murphy 3 days ago.
My daughter, Ciara, has just completed an 11-day trek around the Annapurna Circuit in the Himalayas. She's not a particularly experienced walker, so completing it was quite the achievement. Here's...

  
Summit Comment
Knocknalarabana: A quick drive.
TommyV 3 days ago.
More of a drive than a hike. Well worth it for the views.

Summit Comment
Devilsbit Mountain: Get a bit of the Devil in ya!
TommyV 3 weeks ago.
After a day of bagging some of the more unremarkable summits in North Tipperary, Devilsbit was a delight. There is designated parking at S06115 73178. Follow the waymarked path all the way to the ...

  
Track
Pouy de Hourmigué
David-Guenot a week ago.
walk, Len: 17.9km, Climb: 1379m, Area: France, Occitanie ()

  
Summit Comment
Cooneen Hill: Very average
TommyV 3 weeks ago.
Nothing to add to simon3's directions. Like quite a few of the hills in North Tipperary, this one is through a Coilte forest track to begin with and then the tough push through some horrible groun...


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