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
The Maidens lighthouses Attendant as well as from the headquarters of the Commissioners of Irish Lights at Dún Laoghaire. A racon showing Morse code "M" (--) was added in 1996. The light's nominal range was reduced from 24 to 23 nautical miles in September 2010 and the light characteristic was set at three white flashes every 15 seconds (Fl (3) W 15s). The lighthouse buildings remain in good repair. The Maidens lighthouses The Maidens lighthouses, on the Maidens in North Channel off County Antrim in Northern Ireland, date from 1829 and were built at the request of merchants and a Royal Navy officer.