Start Point Lighthouse

Start Point lighthouse was built in 1836 to protect shipping off Start Point in south Devon, England. Open to the public in summer months, it is owned and operated by Trinity House. It has been designated by English Heritage as a grade II listed building.[1]

Start Point lighthouse
Start Point lighthouse including the well house and keepers cottage
Devon
LocationStart Point
Devon
England
Coordinates50.22144°N 3.63863°W / 50.22144; -3.63863
Year first constructed1836
Automated1993
Constructionmasonry tower
Tower shapecylindrical tower with balcony and lantern
Markings / patternwhite tower and lantern
Tower height92 feet (28 m)
Focal heightwhite: 204 feet (62 m)
red: 180 feet (55 m)
Original lens3rd order catadioptric lens
Intensity815,000 candela
Range25 nautical miles (46 km)
CharacteristicFl (3) W 10s.
F R
Fog signalblast every 60s.
Admiralty numberA0228
NGA number0324
ARLHS numberENG 148
HeritageGrade II listed building 

History

Construction

Start Point is one of twenty nine towers designed by James Walker. The lighthouse is in the gothic style, topped by a crenellated parapet. The main tower is built of tarred and white-painted granite ashlar with a cast-iron lantern roofed in copper. The tall circular tower is 92 feet (28 m) high with a moulded plinth and pedestal stage and two diminishing stages above that. There are two entrances porches, on the north and south sides. The porch on the south side is blocked and has a 4-centred arch hood mould, whilst the doorway to the north porch has a Tudor arch. Both have raised parapets with Trinity House arms. The inside of the tower includes a cantilevered granite staircase around the inside well of the tower with an iron balustrade completed by a cast-iron newel.

The lighthouse originally had the keepers' living accommodation on the ground and first floors but this was removed in 1871 when new keepers' houses were built, either side of the porches to the north and south. In 1882 another cottage was built, detached from the tower, to the east. All three were designed by James Douglass (though the north and south dwellings were rebuilt in the mid-1950s).[2]

Other nearby buildings were used by the lighthouse keepers, who originally could only get on or off the lighthouse by boat, such as the well-house[3] and piggery.[4]

Optics

The original main optic consisted of a rotating octagonal array of eight large (first-order) Fresnel lenses, topped by seven tiers of concave mirrors.[5][6] This was the first time Trinity House had installed a dioptric (i.e. lens-based) optic in one of their lighthouses;[7] manufactured by Cookson & co. of Newcastle-upon-Tyne, the design was based on the improved dioptric system developed from the work of Augustin Fresnel by Alan Stevenson, engineer to the Northern Lighthouse Board.[8]

In 1873, a new lantern was built on top of the tower, designed by James Douglass.[9] In it, a new, more powerful revolving optic was installed, designed by James Timmins Chance: a six-sided symmetrical optic of the first-order, with refracting prisms above and below the central lens elements. At the time its six lens panels (at 60° to the circle) were 'the widest in azimuth hitherto constructed, except some of those of Flamborough Head';[10] the increase in power, compared to the old 45° lenses, was of the order of 3 to 2.[9] Apparatus of the same design were installed the following year in lighthouses at South Stack and Cape Bon.[10]

The light was powered by oil until 1959 when it was electrified.[8] At the same time the optic was replaced by a smaller (third-order) catadioptric lens, made up of two groups of three asymmetrical panels, which produced a group-flashing light characteristic.[11]

In 2018 this rotating optic was replaced by a two-tier LED lantern;[12] the old lens was put on display in the adjacent visitor centre.[13]

In addition to the main light a fixed red subsidiary light is shone from a window in the tower to mark the Skerries Bank.[8] This was commissioned at the same time as the main light (though initially it shone white, not red, and from a higher window).[11] The original light source was a single Argand lamp backed by a 21-inch reflector;[5] but, following the 1873 upgrade, it instead used light diverted by means of prisms from the rear of the main lamp.[9]

Work began on the automation of Start Point Lighthouse in August 1992 and was carried out by LEC Marine at a cost of £82,754. It was completed in early 1993. After automation, the south keepers' cottage (which had been damaged in the 1989 the landslip) was demolished.[11]

The station is now monitored and controlled from the Trinity House Operations Control Centre at Harwich in Essex via a telemetry link.

Foghorn

The light alone was found to be inadequate in fog, and a bell was installed in 1862; the machinery was housed in a small building which still stands on the cliff face to the south-east of the lighthouse.[14] It sounded 48 times every minute, the mechanism being driven by a weight which fell in a tube running down the sheer cliff. A siren replaced the bell in 1877;[8] (the bell was transferred to the lighthouse on Plymouth Breakwater where it still hangs).

The fog siren was housed in a circular building, just to the south of the lighthouse, and sounded (one blast every three minutes)[15] through a roof-mounted horizontal horn which could be turned in the direction of the prevailing wind. The fog signal was upgraded in 1883 by the installation of a two-tone siren; it now sounded thrice every three minutes (high, then low, then high).[16] Around the turn of the century new equipment was installed, including a new pair of 5" sirens sounding through a pair of curved vertical copper trumpets. This was in turn replaced by a more powerful 12" siren in 1928, again housed in the same building, sounded from a pair of conical horns housed in a cast-iron turret on the roof.[17] At the same time a pair of Gardner diesel engines were provided to drive the air compressors, replacing an earlier set of engines.[14]

In 1989, the erosion of the coast caused the fog signal building to collapse. A lot of the area had to be levelled as a result and retaining walls put in place. An electric signal was instead installed on the gallery of the lighthouse (this is itself scheduled for replacement by a more modern system in 2018).[12] When required the foghorn sounds once every 60 seconds.

  • The lighthouse complex
  • The lighthouse seen from the inland end of the peninsula
  • Close up showing masonry construction
  • The lens
  • Seen from the South West Coast Path to the west of the lighthouse
gollark: Possibly three.
gollark: Anyway, potatOS is running on at least two servers.
gollark: You can still install it, you know.
gollark: Infected?
gollark: Fortunately the fusion reactors, when they do work, produce so much power that they can charge giant batteries, so we mostly just use those.

See also

References
  1. Historic England. "Start Point Lighthouse (1107958)". National Heritage List for England. Retrieved 10 August 2007.
  2. Woodman, Richard; Wilson, Jane (2002). The Lighthouses of Trinity House. Bradford-on-Avon, Wilts.: Thomas Reed. pp. 96–97.
  3. Historic England. "Well House immediately North West of Start Point Lighthouse (1107959)". National Heritage List for England. Retrieved 10 August 2007.
  4. Historic England. "Piggery North North East of Start Point Lighthouse (1107960)". National Heritage List for England. Retrieved 10 August 2007.
  5. "Lighthouse management : the report of the Royal Commissioners on Lights, Buoys, and Beacons, 1861, examined and refuted Vol. 2". pp. 86–87.
  6. Tag, Thomas. "The Fresnel Lens Makers (illustration)". The United States Lighthouse Society. Retrieved 9 March 2019.
  7. Wikisource:1911 Encyclopædia Britannica/Lighthouse
  8. "Start Point Lighthouse". Trinity House. Retrieved 9 March 2019.
  9. Elliot, George H. (1875). European Light-House Systems. London: Lockwood & co. p. 184. Retrieved 10 March 2019.
  10. Littell, Eliakim; Littell, Robert S. (1887). "Lighthouse Work in the United Kingdom". The Living Age. 174: 247.
  11. "Worldwide Lighthouses". Start Point Lighthouse. Retrieved 9 March 2019.
  12. "Start Point Lighthouse visitor centre". Trinity House. Retrieved 9 March 2019.
  13. "Start Point Lighthouse". Start Point South Devon. Retrieved 9 March 2019.
  14. Renton, Alan (2001). Lost Sounds: The Story of Coast Fog Signals. Caithness, Scotland: Whittles.
  15. "Fog Signals". Parliamentary Papers, volume LXIV. 23 (337): 2–4. 1 August 1879.
  16. Findlay, Alexander G. (1887). A Description and List of the Lighthouses of the World, 1887. London: R. H. Laurie. p. 22.
  17. Photo c. 1930s-40s showing fog horn building (right)
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.