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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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Summit Comment
Inishsirrer: Uninhabited except a few sheep.
magicstep 9 hours ago.
I did kayak to the island in 2014. There is a slipway facing the mainland. Lot's of ruined houses. Walking is decent as the island is flat but in places ground is uneven and overgrown, there are o...

  
Summit Comment
Knockroe: OMG - I forget to check the MV page!
Pepe a day ago.
Decided to make a day out of a Dublin-Waterford drive, despite low-hanging cloud. Knockroe wore a misty white cap as I glanced up from the Sculloge Gap carpark. Planning my attack (so I thought), ...

  
User profile
ewen
ewen a day ago.
Now living furth of Scotland and getting to know the Irish hills. If you come across a Scottish hill Walker with dodgy knees and walking sedately, stop and say hello.

Summit Summary
Bleantasour Mountain: A boggy but short ascent route
Collaborative entry Last edit by: simon3 2 days ago.
Go to the forest entrance at S22452 09704. there is room here for a few cars.Walk down the forest track, crossing a ford and follow the track until you can see open ground.Walk south along the edg...

  
Track
A handy way up two western Monavulaghs.
simon3 2 days ago.
Easy access to the ridge.Improved RouteUsing the hard won experience of others and new forest roads we found a relati... walk, Len: 6.5km, Climb: 263m, Area: Bleantasour Mountain, Comeragh Mountains

  
Summit Summary
Milk Hill: Carry on bagging
Collaborative entry Last edit by: simon3 2 days ago.
Go to the forest entrance at S22452 09704. there is room here for a few cars.Walk down the forest track, crossing a ford and follow the track until you can see open ground.Walk uphill to the summi...

Summit Comment
Seefin: Fine day spoilt by Scramblers
ewen 2 days ago.
Started at the Coillte gate at 068145 where there is parking for 2 cars. I then followed the forest road around until the first turn off to the left. This takes you along to the fire break/path at...

  
Forum: General
Local 97
marymac 4 days ago.
An abstract Artist, Charles Shaw, said "Real happiness consists in not what we actually accomplish, but what we think we accomplish." I moved house. So my Local 100 changed. The new list includes ...

  
Summit Comment
Gortrumnagh: Drive or Walk
sandman 2 days ago.
The gravel track at L6133851903 will bring you up to the second quarry workings allowing you to park at L6213651955 and enter the open hillside via a gate just inside the quarry to the left. No si...

Track
Hacha Grande by following my nose.
jackill 2 days ago.
walk, Len: 11.5km, Climb: 636m, Area: Spain, Canary Islands ()

  
Summit Comment
Derrylahan: Coastal Hill
sandman 2 days ago.
As this hill is located in a field covered in gorse bushes the easiest access is via the adjacent land owner. Parking at L6670259115 i was fortunate to bump in to the farmer whose farm yard is loc...

  
Summit Comment
Ballynew: Coastal Hill
sandman 2 days ago.
Park at L6231659377 opposite a very modern designed house and follow the non tared track and as it turns right go straight up hill thru an old overgrown trail still used by some cattle on there ow...


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