Is erected on an island, or rather the summit of an isolated rock, from which it takes its name, situated at the south west point of Holyhead mountain, and about four miles from the town. This splendid structure was commenced in the month of August, 1808; and the light was first exhibited on the night of the 9th of February, 1809, and is of essential service in facilitating the access to the Holyhead Harbour. It was built at the sole expense of the Corporation of Trinity House, London. The light is a revolving one, displaying a full-faced light every two minutes, which, in clear weather, is distinctly visible at a distance of ten leagues. The frame that is attached to the pivot on which the Argand lamps is fixed is triangular, having seven brilliant lamps and powerful reflectors on each side or face. The different lamps which illuminate by night have behind them large brass reflectors, lined with silver, and kept in a state of unsullied brilliance. The angles of the triangle, being all acute, the light cannot be seen when any of them points towards an object which is more than a league distant. This affords to mariners the means of distinguishing it from the Skerries Light, distant from the South Stack about nine miles. A moveable red light is also placed for the use of the government packets. The elevation of the summit of the rock on which the Lighthouse is erected, is 140 feet above the level of the sea at high water mark; the height of the tower, from the base to the gallery, is 60 feet, and the lantern is 12 feet from the gallery, making the total elevation of the light 212 feet above high water mark, and is visible over the whole of Carnarvon Bay. The whole of this establishment was under the able superintendence of Captain H. Evans, who first pointed out the necessity of erecting a light on this spot, and whose name is imperishably connected with Holyhead and its vicinity.