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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 .. 18 Next page >>
Summit Comment
An Cnoc Fada: The majesty of the Poisoned Glen in the snow
mcrtchly a day ago.
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Summit Comment
Tomies Mountain: Light on Tomies and Purple
davsheen 2 days ago.
Tomies and Purple in the Light from Muckross

  
Summit Comment
Derrygarriff: Free as a bird
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We were lucky to see a white tailed eagle gliding gracefully over Eirk Lough before before coming to rest on a rock, which provided the opportunity to capture a pic of the rarely seen bird of prey...

Summit Comment
Foardal: Beyond a shadow of a doubt
Colin Murphy a week ago.
The French writer Maupassant used to say he had lunch in the Eiffel Tower every day because it was the only place in Paris that he couldn't see the thing. A similar view might be taken of Foardal,...

  
Track
The Beara-Breifne Way Day 6
mlmoroneybb 5 days ago.
Thanks to all for making the weekends on the Beara-Breifne Way so special. We have completed 187Km in 7 Day?s walking walk, Len: 30.3km, Climb: 781m, Area: Paps/Derrynasaggart (Ireland)

  
Track
The Beara-Breifne Way Day5
mlmoroneybb 5 days ago.
Day 5 we set out for Ballyvourney where some of us put our cupla focail to good use. Along this trail we came across man walk, Len: 23.4km, Climb: 483m, Area: Shehy/Knockboy (Ireland)

Forum: General
Enjoy your trip
BleckCra 4 days ago.
The first flurry of snow here in Armagh. A biting wind. Antenna whiskers taste the chill air and the prospect of picture postcard winter days. In no time at all, the Cairngorm Mountain Rescue will...

  
Forum: General
Hillocks
BleckCra 6 days ago.
Simon. Himself is the well known to some, Bernard Hill. Less well known of course are hills to do with ants, except to some. Keep er lit though. At least some sort of discussion and of course only...

  
Summit Summary
Foardal: Simple approach from NW
Collaborative entry Last edit by: Colin Murphy a week ago.
If you want to do this in isolation, the simplest route is from the car park at V882790, and then heading SE directly up the heathery slope for 1km. The summit itself is a broad heathery mound.

Track
The Beara-Breifne Way Day7
mlmoroneybb 5 days ago.
On Sunday, we were not attacked by the MacCarthys of Drishane Castle but started our walk on the O?Keefe Booning Castl walk, Len: 27.7km, Climb: 362m, Area: Paps/Derrynasaggart (Ireland)

  
Track
The Beara-Breifne Way Day4
mlmoroneybb 5 days ago.
The Saturday trek started in the scenic village of Glengarriff. From here a short boat trip brought some of our members... walk, Len: 27.5km, Climb: 783m, Area: Shehy/Knockboy (Ireland) Foilastookeen

  
Summit Summary
Derrygarriff: Fine summit, easily reached.
Collaborative entry Last edit by: Colin Murphy a week ago.
There are access issues around Moll's Gap, so suggest starting at car park at V882790 and proceeding up the heathery slopes to Foardal - about 1km to the SE, before walking the 1.5km to the SW to ...


RECENT CONTRIBUTIONS 1 2 3 .. 18 Next page >>