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 height of 29 metres. It is the oldest of the Arran lighthouses and situated on the Isle of Pladda just off the Southern tip of the Isle of Arran. Pladda lighthouse is not only the oldest lighthouse around Arran but also one of the oldest lighthouses in Scotland. Pladda lighthouse was built in 1790 by Thomas Smith and showing a lower light from a small lantern 20 feet below the main light to allow seafareres to distinguish Pladda from other lighthouses close by, notably those on the Mull of Kintyre, Cumbrae and Copeland at the Irish coast. The lighthouse was