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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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RECENT CONTRIBUTIONS 1 2 3 .. 19 Next page >>
Track
Brockagh Tops
Bunsen7 3 hours ago.
Similar track to a number of others which I used for guidance. Parked at the forest entrance having turned up at the ... walk, Len: 14.5km, Climb: 517m, Area: Brockagh Mountain SE Top, Dublin/Wicklow

  
Forum: General
Do your VITAL bit for hillwalking maps soon.
simon3 4 hours ago.
Ordnance Survey Ireland bring out a high proportion of the maps of interest to hillwalkers in Ireland. They are the only source of mapping for vast swathes of the island of Ireland. But since they...

  
Track
Lake District: Skiddaw via Ullock Pike
Onzy 20 hours ago.
Classic route in the lakes... walk, Len: 15.3km, Climb: 1062m, Area: Ullock Pike, Lake District - Northern Fe...

Track
La Gomera - GR132
GSheehy 2 days ago.
In 1492, Columbus set out from San Sebasti

  
Summit Summary
Doughruagh: Rocky summit with access issues from Kylemore Abbey
Collaborative entry Last edit by: liz50 4 days ago.
Located behind Kylemore Abbey, it has been reported that access from the grounds is no longer allowed. It is possible to park in a small lay-by at L77637 58711 and walk approx 30m along the road t...

  
Summit Summary
Doughruagh South Top: Twin of Doughruagh main top
Collaborative entry Last edit by: liz50 4 days ago.
Located behind Kylemore Abbey, it has been reported that access from the grounds is no longer allowed. It is possible to park in a small lay-by at L77637 58711 and walk approx 30m along the road t...

Summit Summary
Raghtin More: The smallest Inishowen Arderin
Collaborative entry Last edit by: liz50 5 days ago.
The easiest approach is to park at Urrismenagh viewpoint carpark C317 443 and follow the track to its highest point. From here you can avoid Crockmain and carry on towards Raghtin More to the Nort...

  
Summit Summary
Crockmain: An uninspiring summit with great views
Collaborative entry Last edit by: liz50 5 days ago.
The easiest approach is to park at Urrismenagh viewpoint carpark C317 443 and follow the track to its highest point before heading north over heather to the summit. Alternatively from Mamore Gap c...

  
Summit Summary
Knocknanacree: Views to Slieve Mish and the Dingle Peninsula
Collaborative entry Last edit by: liz50 5 days ago.
Summit can be approached from the West by parking near Minard Castle V556 992 and following a rough track uphill past a quarry and onto the summit ridge.A shorter steeper approach is possible from...

Summit Summary
Currywongaun: Rough and Rocky
Collaborative entry Last edit by: liz50 4 days ago.
Park off road in a small lay-by at L72134 59157 and ascend the spur in a roughly Easterly direction to the summit. Usually climbed en-route to its larger neighbor Doughraugh.

  
Summit Summary
Teeromoyle Mountain: A summit in the middle of a classic Horseshoe walk
Collaborative entry Last edit by: liz50 5 days ago.
This summit is usually accessed whilst walking the Glenbeigh Horseshoe. A shortened version taking in the 4 central 600m summits in the centre of the horseshoe Teeromoyle, Coomacarrea, Mullaghnara...

  
Summit Comment
Bruse Hill: Bruse
Nekarsulm 6 days ago.
Track up from the quarry is overgrown. I partially walked up a small stream, as it at least cuts its way through the whins. Climbing straight upwards, you will see places where some earlier climbe...


RECENT CONTRIBUTIONS 1 2 3 .. 19 Next page >>