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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 .. 27 Next page >>
Summit Comment
Slieve Foye: Irish Gabbro!
IainT 6 days ago.
Gabbro is one of the roughest and most frictiony rocks around and is superb for scrambling on, as all visitors to the Skye Cuiilin across the water know. I never realised until yesterday that Slie...

  
Summit Comment
Illanmaster: Watching Over.
sandman 23 hours ago.
This hill watches over Illanmaster Island and although its summit is nothing of note its cliffs are fantastic. As described previously this can be part of a coastal walk or for direct accent park ...

  
Track
Mweelrea Mt via Ben Lugmore
marzka a day ago.
A very nice walk with amazing views and small bit of scrambling which can be avoided.Dificulty: Medium- ascending via... walk, Len: 13.4km, Climb: 1111m, Area: Ben Lugmore East Top, Mweelrea Mountain

Summit Comment
Corraduff Hill: Coastal Hill
sandman a day ago.
Corraduff Hill as seen from the Benwee Loop Walk.

  
Track
Bencorrbeg - Binn an Choire and Binn Dubh
marzka a day ago.
Very nice walk with a bit of scrambling.And this GPS track involve that mentioned part of scrambling - but if you want... walk, Len: 10.4km, Climb: 944m, Area: Bencorrbeg, Twelve Bens (Ireland) Benco

  
Summit Comment
Benwee NE Head: Coastal Hill
sandman a day ago.
It is easy to reach the area i took the photo from just a slight detour off the Benwee Loop Walk F8220244947 it is the next bit that the problem arises. Definitely an Ian Miller summit.

Track
Teermoyle and Been Hill
marzka a day ago.
Very nice walk with goregous views.Dificulty: Medium- a bit wet terrain, mostly grassy- some small part of walk on th... walk, Len: 13.2km, Climb: 843m, Area: Keamconneragh, Glenbeigh Horseshoe (Irel

  
Summit Comment
Doonvinalla W Top: Coastal Hill
sandman a day ago.
The Stags of Broad Haven just one of the fantastic photo opportunities from this summit which is easily accessed from the Benwee Loop Walk the easy option from the pier at Portacloy F8395844259.

  
Track
Mangerton via Stoompa and Horses Glen
marzka a day ago.
Lovely walk with stunning views.Dificulty: Medim- wet terrain as crossing the Owgariff river- very steepy descending w... walk, Len: 13.6km, Climb: 673m, Area: Stoompa, Mangerton (Ireland) Stoompa, M

Summit Comment
Doonvinalla E Top: Coastal Hill
sandman 2 days ago.
Easy access from the pier at Portacloy F8395844259 follow the Benwee Loop walk and branch off where appropriate . The photo shows views across towards Benwee Head in the background .

  
Track
Carrauntoohil via central guy and dawn via oshea-gully WINTER WALK
marzka a day ago.
This is a winter climb, therefore the winter equipment is needed and extra time should be added while planning that r... walk, Len: 10.6km, Climb: 779m, Area: Carrauntoohil, MacGillycuddy's Reeks (Ir

  
Summit Comment
Doonvinalla N Top: Coastal Hill
sandman 2 days ago.
Looking across to Doonvinalla N Top from E Top i decided it was above my pay grade to attempt the summit climb today . But to the right of the photo a route to the top seemingly exists so another ...


RECENT CONTRIBUTIONS 1 2 3 .. 27 Next page >>