There is a photo (p 62) of the ruins of Langness Farm in "Tholtans of the Manx Crofter" by Gordon a Kniveton and Mike Goldie. reprinted in 1996 so mabe still available at MNHL bookstore. My grandfather John Killey was a steward at Langness Farm at one time in the 1870's or 80's. I have taken photos from time to time, of the tholtan and have seen how the walls have gradually fallen down over the years.