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I took this photo .. by Inazone   (Show all posts)
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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 >>
Forum: General
Re: Sligo, Leitrim, Roscommon
Peter Walker 15 hours ago.
Hi daithi07The 'what's left to do in Ireland' article currently lives largely in my head rather than anywhere more tangible. It will see the light of day at some point in the next few months. I am...

  
Track
12 (Listed) Bens - Revisited
GSheehy a day ago.
I was drawn back by the lure of completing the 2002 - 12 Bens Challenge route. I got the details from John J. Cotter w... walk, Len: 29.1km, Climb: 2598m, Area: Benglenisky, Twelve Bens (Ireland) Ben

  
Track
Greece, Pelion Peninsula: Paou to Chorto return
Onzy a week ago.
walk, Len: 8.3km, Climb: 237m, Area: Greece, Thessaly ()

Track
Greece, Pelion Peninsula: Affisos to Afetes return (2)
Onzy a week ago.
walk, Len: 9.7km, Climb: 458m, Area: Greece, Thessaly ()

  
Summit Comment
Big Collin: Permission required?
StephenMullin a week ago.
Hi thereCan anybody tell me if permission is required to walk up Big Collin? If so, how does one go about obtaining this?Many thanks!

  
Track
Greece, Pelion Peninsula: Portaria Circuit
Onzy a week ago.
walk, Len: 14.3km, Climb: 644m, Area: Greece, Thessaly ()

Summit Comment
Knockroe: Where Summits relocate with No Plate Movement
CaminoPat 3 days ago.
Knockroe summit is listed as being located in County Cork. The correct location however is County Waterford. Déise abú.

  
Summit Summary
Anglesey Mountain: Great Carlingford views from a so-so top
Collaborative entry Last edit by: Colin Murphy a week ago.
There is enough space to park one car at 100 167, just on the edge of a wood around a sharp u-bend. Proceed north for 100m before turning NE up a gentle slope, although the terrain is treacherous ...

  
Summit Summary
Pigeon Rock Mountain South Top: Nondescript summit for baggers only
Collaborative entry Last edit by: Colin Murphy a week ago.
Usually done in conjunction with Pigeon Rock itself, but can be done in isolation if you want. Car park can be found at 234 278 A. Take the track directly across the road that follows the Rocky Ri...

Track
Greek Islands: Kos
Onzy a week ago.
walk, Len: 5.8km, Climb: 381m, Area: Greece, South Aegean ()

  
Summit Comment
Wee Slievemoughan: The ups and downs
Colin Murphy a week ago.
Approaching from Rocky Mountain summit requires a bit of up-and-down trekking, as it is necessary to first ascend Tornamrock and then drop down again to a the col to the south before ascending Wee...

  
Track
Greek Islands: Kalymnos
Onzy a week ago.
walk, Len: 1.8km, Climb: 183m, Area: Greece, South Aegean ()


RECENT CONTRIBUTIONS 1 2 3 .. 23 Next page >>