It is so beautifully balanced that the upper stone, though of enormous weight, can be easily rocked by pushing it with an umbrella. ... I think it is one of the finest cromlechs I have seen. --- Annesley.
That's Lord Annesley to you, showing off his photographs of the cromlech on his land near Castlewellan. From the Journal of the Royal Society of Antiquaries of Ireland, Fifth Series, Vol. 5, No. 1 (Mar., 1895).