When on Inis Mor twenty years ago, we walked along the coastal path to a pub called Tigh Fitz's, on the way to the airfield. As it happened, we got sunburnt on the way and we were grateful for the shade of the very basic pub and I for the lovely smooth pint of Guinness served up there. Sadly the pub is no more but nearby, I found these beacons to guide boats into the small harbour nearby.
Galway really seems to be the place for these beacons. There are others, all conical, at Lettermullan and Gorumna and one near Rossaveal. There are also a lot of them at the mouth of the River Boyne, leading into Drogheda. The way into this harbour was marked by two types of beacons, both conical and tapered, the latter appearing to be somewhat newer.
The beacons were erected, rocks blasted and the entrance channel widened in the period 1887 to 1889.