Cloch

Cloch Lighthouse

Cloch Point light from the north, looking towards Innellan
Location	Firth of Clyde NS202758
OS grid	NS2031975877
Coordinates	55°56′32″N 4°52′44″W / 55.94232°N 4.87877°W / 55.94232; -4.87877
Tower
Constructed	1797
Built by	Thomas Smith, Robert Stevenson
Construction	white tower with a black band
Height	76 feet (23 m)
Operator	Clyde Port Authority
Heritage	category B listed building
Fog signal	(c.1895)
Light
Focal height	76 feet (23 m)
Light source	Oil (1797–1829) argand lamp (1829–c.1900) acetylene (c.1900–)
Intensity	40,000 candela
Range	14 nautical miles
Characteristic	Fl. W 3sec

Cloch or Cloch Point (Scottish Gaelic: stone) is a point on the east coast of the Firth of Clyde, Inverclyde, Scotland. There has been a lighthouse on the point since 1797 to warn ships of The Gantocks, a shipping hazard in the Firth. Later circa 1886, a navigation beacon was constructed on the Gantocks rocks.

Cloch Point lies on the A770, north of Inverkip, three miles south-west of Gourock, on the east shore of the Firth of Clyde, directly opposite Dunoon.

The Cloch Lighthouse was designed by Thomas Smith and his son-in-law Robert Stevenson. The building was completed in 1797. There appear to be two generations of keepers' houses, the older now used as stores and the more recent having crow-stepped gables. The short circular-section tower has a corbelled walkway and triangular windows. The foghorns were added between 1895 and 1897.

The light was built by John Clarkson (engineer); Kermack and Gall built the tower, while Smith and Stevenson installed the oil lantern which was first lit on 11 August 1797.^[1] The light was replaced in 1829 with an argand lamp and silvered reflector. About 1900, it was lit with acetylene. A radio beacon was installed about 1931.

The dioptric and catadioptric lenses floated in baths of mercury and were rotated by a clockwork mechanism powered by falling weights.^[2] As well as tending the light, the keepers had to wind the mechanism by hand every two to three hours.

Today, the light is fully automated and unmanned. The main light has been replaced by a light on a pole outside the lantern room.

• List of listed buildings in Inverkip, Inverclyde

• Allan, Jennifer Lucy (2018). "Disturbing the Peace: The Cloch Foghorn and Changing Coastal Soundscapes in the 19th Century". In Strang, Veronica; Edensor, Tim; Puckering, Joanna (eds.). From the Lighthouse: Interdisciplinary Reflections on Light. Routledge. ISBN 9781472477354.