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
Conservation and restoration of lighthouses and on paper. Strong winds and waves cause land erosion around lighthouses. Over extended periods of time, the promontories that lighthouses are normally built on can be eroded to the point where the safety of the lighthouse is impacted. In extreme cases, the lighthouse might need to be relocated to a new plot of land in order to preserve the structure. There are four major lighthouse moves that have taken place in the United States: Block Island Southeast Lighthouse, Cape Hatteras Lighthouse, Sankaty Head Lighthouse, and Gay Head Lighthouse. Conservation and restoration of lighthouses The conservation and restoration of lighthouses