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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 .. 23 Next page >>
Summit Comment
Stockeen Cliff Top: Coastal Hill
sandman a day ago.
Located adjacent to the cliff walk accessible via the Cliffs of Moher Center. Best to enjoy the full walk rather than just summit bagging but for your added enjoyment the earlier in the morning yo...

  
Summit Comment
Lislorkan Top: Coastal Hill
sandman a day ago.
Accessible via the Cliffs of Moher Visitor Center and car park or via other locations on this coastal walk of your choosing. Best to enjoy the full length of this fantastic cliff walk.

  
Summit Comment
Knockardakin: Coastal Hill
sandman a day ago.
Located adjacent to the world renowned Cliffs of Moher,and although this is the hill which the visitor center is built into, the summit is not located in a public area. Access is via a farm gate o...

Summit Comment
Corduff: My wee dander to the summit
Ulsterpooka 3 days ago.
I followed Muschi's and Paddyhilksbagger route. When going to the trig I moved on a few cows before I walked to the trig. After taking a few pics I seen the large brown bull in the field was block...

  
Track
Inishowen Slieve Snaght from the north.
simon3 5 days ago.
This linear walk route starts from the north and includes the two Arderins and one Vandeleur-Lynam in the area. It sta... walk, Len: 9.3km, Climb: 515m, Area: Slieve Snaght, Inishowen (Ireland) Sliev

  
Track
Cruach Eoghanach
Peter Walker 6 days ago.
Cruach Eoghanach is a handy outing on the days when you get out of the car, feel the force of the wind and rain, look... walk, Len: 10.4km, Climb: 329m, Area: Cruach Eoghanach, S Donegal/W Tyrone (Ir

Summit Summary
Slieve Main: Inishowen's second mountain.
Collaborative entry Last edit by: simon3 5 days ago.
Parking in a small quarry 3km to the east at point C444 372, cross the smaller top of Damph and then head north, curving around the valley until you cross a fence at C425 380 then begin to ascend ...

  
Forum: Suggestions
Clare Coastal Hills
simon3 3 days ago.
We have added 14 Coastal Hills for Clare today. Intriguing names like Stockeen Cliff Top, 185mJust to remind. A Coastal Hill is a hill of at least 50m with a drop from the top or prominence of 20m...

  
Track
Arona to Parador Hotel via Valle de Ucanca
GSheehy 3 days ago.
Sticking the boots in the bag, when the intention was to go and have a rest.Justifying a walk, that?s predominantly as walk, Len: 30.8km, Climb: 2274m, Area: Spain, Canary Islands ()

Track
Pics de Batoua
David-Guenot a week ago.
walk, Len: 18.3km, Climb: 1672m, Area: France, Occitanie ()

  
Summit Comment
Castlemahon Mountain: My outing to Castlemahon summit.
Ulsterpooka a week ago.
I followed Peter Walkers route and asked permission to walk to the summit mast. The person was very friendly and accommodating. I parked at the last house in what is a four house dwelling lane. Th...

  
Track
Amalfi: Ravello to Minori
Onzy a week ago.
walk, Len: 3.5km, Climb: 12m, Area: Italy, Campania ()


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