Two miles off Land's End, on a mass of rocks which rise some seventy feet above the surface at low water, stands the Longships Lighthouse, the summit of which is fifty-six feet above the rock.  The tower is divided into three stories.  In the lower is kept provisions, with water and coal; the second is a cooking-room and oil-store: while the third is a sleeping-room.  The lantern consists of a brilliant catoptric fixed light, produced by nineteen Argand lamps.  It was built in 1793 by a Mr Smith.  Before the granite blocks of which it is composed were brought to the rock, they were hewn out and put together at Sennen Cove.  The stones are dovetailed one into the other, and are secured by oak trennels strongly cemented.  Often, when a storm is raging, the waves beat completely over the structure; indeed, when any wind is blowing, it is surrounded by masses of foam.  Four men belong to the lighthouse, three always remain in it, and one goes on leave every twenty-eight days, when the weather permits; but this, during the winter season, is very often impossible; and sometimes for weeks together the man on shore cannot get off.