A tale of two lighthouses

The head of the Clyde Estuary is marked by two lighthouses.  The more famous one is just south of Gourock, at Cloch Point.

This is the Cloch lighthouse, taken from the Dunoon to Gourock ferry (which takes a much closer course to the eastern shore than on the outward journey.)  The Cloch was built in 1797, designed by Thomas Smith and his son-in-law Robert Stevenson, who became one of the world's greatest lighthouse designers - the Bell Rock is probably his most famous design. Thomas Smith, however, was the first lighthouse designer in the family - he was the first engineer of the Northern Lighthouse Trust, having made his name designing innovative reflectors for the lighting of the New Town in Edinburgh.  Most of the work on the Cloch was done by Thomas Smith.
The light is opposite the Gantocks, a particularly nasty rocky ledge just off Dunoon, and was originally intended to warn ships off them.  Perhaps the Cloch was best known for the foghorn, which was compared to the sound of a cow in acute distress!  It's now a private house, and the light in the tower has been replaced by one on a pole.  The light is fully automated.
During both World Wars there was a coastal battery located here, and the terracing for the guns became the starting point for the caravan park which can be seen behind the lighthouse. The Inner Clyde was protected by an anti submarine boom which ran from the Cloch to Dunoon, coming ashore just below the statue of Highland Mary
The Gantocks now have their own light - properly just a beacon, which dates in its current form from 1898.

The Gantocks are completely submerged at high tide.