Great Basses Reef Lighthouse

Great Basses Reef Lighthouse is an offshore lighthouse in the south of Sri Lanka, and it is operated and maintained by the Sri Lanka Ports Authority. It is located on a reef 13 km off the coast of Yala National Park, near Little Basses Reef Lighthouse. It is accessible only by boat. The two Basses lighthouses, 'Great' and 'Little', are among the most famous offshore lighthouses of Asia.

Great Basses Reef Lighthouse
Great Basses Reef Lighthouse
Sri Lanka
LocationSouth of Sri Lanka
Coordinates6°10′55.46″N 81°28′58.82″E
Year first constructed1873
ConstructionScottish granite tower
Tower shapecylindrical tower with double balcony and lantern
Markings / patternwhite tower and lantern
Tower height37 metres (121 ft)
Focal height34 metres (112 ft)
Light sourcesolar power
Range34 nautical miles (63 km; 39 mi)
CharacteristicFl W 15s.
Admiralty numberF0840
NGA number27272
ARLHS numberSLI-010
Managing agentSri Lanka Ports Authority[1]

History

The necessity of a lighthouse was acknowledged in 1856, a design of an iron tower on a granite base was suggested and costs began to be incurred with no results.[2]:ch7

A new design of the lighthouse by Alexander Gordon and Sir James Nicholas Douglass was put forward in 1867 and approved. The executive engineer in charge was William Douglass, brother of James. Two steam vessels were used, each capable of carrying 120 tonnes of stone and each equipped with lifting gear,[2]:ch7 as each block weighs 2 to 3 tons.[3] The first stone was laid in December 1870, the last in late 1872 and the light was lit in March 1873. The cost had been £63,000, of which £40,000 had been expended to no effect before Trinity House and William Douglass were involved.[2]:ch7

It withstood the force of the 2004 tsunami with only modest damage; it was repaired with assistance from the UK lighthouse authorities Trinity House and The Northern Lighthouse Board.

The reef is the site of the Great Basses wreck, an early 18th-century wreck of an Indian ship, carrying a treasure of silver rupees, that Arthur C. Clarke and Mike Wilson discovered in 1961.

Lens

Great Basses was one of a limited number of lighthouses that were designed to house the large Hyperradiant Fresnel lenses that became available at the end of the 19th century. Four of these lenses were used in Sri Lankan lights, all made by Chance Brothers in England.[4]

gollark: Basically, æons have precognition, pinks have influence, whites have ward, reds have incubate, magis have teleport, purples have fertility, greens have earthquake, plus there are some other more exotic ones (bite, corporealize).
gollark: Yep!
gollark: White dragons: stop eggs dying of sickness for 6 hours (quite useless)
gollark: Purple dragons: makes breeding more likely.
gollark: Pink dragons: modify chance of it coming out each gender; makes it more likely to be the pink's gender.Aeon Wyverns: show you the gender directly.Red dragons: Incubate BSA, takes a day off an egg's timer.

See also
  • Getting new supplies
  • The lighthouse as seen from Yala National Park.

References
  1. Great Basses Reef The Lighthouse Directory. University of North Carolina at Chapel Hill. Retrieved April 2, 2016
  2. "LIFE OF WILLIAM DOUGLASS M.INST.C.E." (PDF). uslhs.org.
  3. Clarke, Arthur C. (1974). The treasure of the Great Reef (1st revised ed.). New York: Ballantine Books. pp. 15–16. ISBN 0345238451.
  4. "Hyper-Radial Lenses". United States Lighthouse Society. Retrieved 26 July 2016.


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