Casquets lighthouses per ton of ship when vessels passed the rocks and in turn he paid Trinity House 50 pounds per year for the right to run the lighthouses. The lighthouses reverted to Trinity House in 1785. They were converted to oil lamps with metal reflectors which were first used on 25 November 1790; and upgraded again with apparatus to rotate a beam of light in 1818. This had a clockwork mechanism which was wound up every hour and a half and gave one flash every 15 seconds. The lighthouses were badly damaged and the lanterns smashed in a severe storm on
Lighthouses on the Isle of Arran since. The light Fl(2)20s38m25M. Lighthouses on the Isle of Arran Three lighthouses can be found around the shores of the island of Arran in the Firth of Clyde. One is located on the Isle of Pladda in the South and the other two can be found on Holy Isle in Lamlash Bay to the East of Arran. All three are still in service and maintained by the Northern Lighthouse Board. They are now fully automatic since the electrification of both lighthouses on Holy Isle in 1977. Until up to the appointment of the Commissioners of the Northern Lighthouses (later Northern