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Would a deft hand .. by jeancan   (Show all posts)
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.
I took this photo .. by john_desmond   (Show all posts)
On a recent trip t.. by pdtempan   (Show all posts)
Hi all. I'm reall.. by paulca   (Show all posts)
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RECENT CONTRIBUTIONS 1 2 3 .. 19 Next page >>
Track
Mullaghcleevaun North Loop
Abruzzese less than an hour ago.
In good weather and dry ground, rewarding views on lough Dan, Blessington lake, and west Dublin, with a binocular, fro... walk, Len: 19.0km, Climb: 740m, Area: Dublin/Wicklow (Ireland) Duff Hill, Mul

  
Track
Slieveboy Loop
jgfitz an hour ago.
We followed the official National Loop Walk, Loop 106C, which is the purple trail. We took one small shortcut, but add... walk, Len: 14.1km, Climb: 424m, Area: Slieveboy, North Wexford (Ireland) Slie

  
Summit Comment
St Patrick's Island: Please Respect the Birds
Pepe 8 hours ago.
Do note that this island is an important bird sanctuary. The scale of birds here surprised me, much more than on neighbouring Colt and Shenick islands, I should have heeded the cacophony of their ...

Track
Feet in bog, eyes on planets.
simon3 13 hours ago.
RossnafinnaSince we brought up the number of islands we have to over 570, when looking for a shorter walk I take a lo... walk, Len: 1.7km, Climb: 65m, Area: Rossnafinna Island, Mayo Islands (Ireland)

  
Forum: Suggestions
Outage
simon3 a day ago.
Members - MountainViews failed yesterday 23rd June 2018 . The cause was a problem at our hosting company which was resolved in late afternoon.Let us know if the issue returns.

  
Summit Comment
Knockbwee: Summit Revealed
CaminoPat 2 days ago.
From the south, parking available for only one car at W124 775. Proceed uphill from junction with local road in a NNW direction along a rough stone covered road until you come to a six bar field g...

User profile
Fergalh
Fergalh a day ago.
Hill walks and Way Marked Trails...

  
Track
Corraun Circuit
Onzy a day ago.
Route taking in Corraun and its East top. Essentially a variation on Wicklore's track 1404, but without the lift on t... walk, Len: 10.8km, Climb: 604m, Area: Corraun Hill East Top, Achill/Corraun (I

  
Summit Summary
Rossnafinna Island: Small island with huge views.
Collaborative entry Last edit by: simon3 2 days ago.
This island can be reached from the north at around F80097 03359 by a small but driveable bridge.There is one central path heading SE from the bridge. There are extensive turf cuttings on both sid...

Track
Crossing the Corraun Plateau
simon3 a day ago.
There were various other tracks before this one going onto the Corraun plateau but none crossing from one side to the ... walk, Len: 13.7km, Climb: 648m, Area: Corraun Hill, Achill/Corraun (Ireland)

  
Track
Mournes: Donard and Satellites
Onzy a day ago.
Route to Donard from Bloody Bridge via Crossone taking in Millstone Mountain on the return. walk, Len: 10.6km, Climb: 871m, Area: Crossone, Mourne Mountains (Ireland) Cros...

  
Summit Summary
Crocknafarragh SE Top: Climb it, but include one or more "cousins"
Collaborative entry Last edit by: simon3 4 days ago.
The way to Crocknafarragh SE Top can follow the full route up to Crocknafarragh with an additional 700m walk out to the lesser top or, part of the way up, by contouring up and around the S flanks ...


RECENT CONTRIBUTIONS 1 2 3 .. 19 Next page >>