|Ballintombay Upper II - Bullaun Stone|
This bullaun stone stands in a most idyllic location, but it's a bit muddy to reach. It stands between two branches of a stream in a copse of deciduous trees. The streambed is gravel making the waters babble.
The stone is a large rectangular block, about 1.5m x 1m x 50cm high, with 2 basins and sits on the ground rather than being set (so it could have been placed here at anytime). One of the bullauns is quite shallow, but the other is more full. There is a large fissure running along the length of the stone and both basins are on the same side of this. It looks like a natural fault in the stone, but may have been widened in an aborted attempt to break up the stone.
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This is an explanation of (and a bit of a disclaimer for) the coordinates I provide.
Where a GPS figure is given this is the master for all other coordinates. According to my Garmin these are quite accurate.
Where there is no GPS figure the 6 figure grid reference is master for the others. This may not be very accurate as it could have come from the OS maps and could have been read by eye. Consequently, all other cordinates are going to have inaccuracies.
The calculation of Longitude and Latitude uses an algorithm that is not 100% accurate. The long/lat figures are used as a basis for calculating the UTM & ITM coordinates. Consequently, UTM & ITM coordinates are slightly out.
UTM is a global coordinate system - Universal Transverse Mercator - that is at the core of the GPS system.
ITM is the new coordinate system - Irish Transverse Mercator - that is more accurate and more GPS friendly than the Irish Grid Reference system. This will be used on the next generation of Irish OS maps.