The Cloch Lighthouse is located on Cloch Point, Inverclyde, 2½ miles (4 km) west southwest of Gourock, on the eastern shore of the Firth of Clyde, in Scotland. Designed by Thomas Smith and built in 1797, the 14 m (46 ft) round cylindrical stone tower warned boats away from “The Gantocks “ - a dangerous reef of drying rocks close to shore. The white tower features a single narrow black horizontal band and is attached to 1-1/2 story stone keeper's house. The light has a range of 14 miles (23 km) and was originally illuminated by an acetylene flame, with the lenses floating on a bath of mercury and rotated by a clockwork mechanism, which had to be wound by the light-keepers every few hours. A foghorn was added in 1897. The name Cloch comes from the Gaelic for stone.
The Royal Mail issued on September 16th, 2010 a wonderful series called "Medical Breakthroughs” celebrating six important medical discoveries made by British doctors and scientists. Two of these discoveries are part of my job as an anesthesiologist in operating rooms: total hip replacement surgery and artificial lens implant surgery treating cases of cataracts. The stamp shows a beautiful image of an implanted lens in the eye replacing the crystalline lens. Thank you, Alan.