As mentioned in the Forum here is a bit of History about this Lighthouse
In December 1865 and January 1866 storms raged in the North Channel and were of such unprecedented ferocity that on 30 and 31 December 1865, 24 vessels were wrecked or driven ashore in the area bounded by Tiree, Iona, Colonsay and Islay. There were renewed petitions for the erection of a light and after the Commissioners had examined the records of wrecks produced by Captain Fraham of the PHAROS they were resolved in its favour. The statutory sanction of the Board of Trade was obtained on 20 October 1866.
In preference to Tinkershole on the East side of Iona, the island of Erraid in the sound of Iona was chosen as the site of the Shore Station.
On 7 June 1867 the steam tug POWERFUL of Leith picked up workmen at Aberdeen and sailed west. Preliminary arrangements included the dressing and fitting of the whole of the materials on a platform at the shore Station; for the materials to be put on the decks for four barges capable of

carrying 20 tons of stone at a time and towed to the rock by a paddle steamer which was fitted out as a tug (the "Dhuh-eartach") and for a vessel of 60 tons to be moored at a convenient distance from the rock to accommodate the men working on the rock until such times as the temporary barrack was erected for the use of the workmen in the summer. This barrack was to be built on similar lines on those used at the Bell Rock and Skerryvore - ie it was constructed of a malleable iron framing fixed into the rock, rising 35 feet above the rock's surface and 60 feet above high water mark and on which was to be placed the habitable part of the barrack, formed of a malleable iron cylinder of riveted plates, 20 feet in height and 16 feet in diameter and divided into two storeys.
History taken
From
Thanks to the NLB