Wolf Rock Lighthouse

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Wolf Rock Lighthouse

Cornwall


Wolf Rock Lighthouse
Location
Location: 49°56’49"N, 5°48’26"W
Characteristics
Height: 380 feet
Tower shape: tapered cylindrical tower
with lantern and helipad
History
Built 1861 to 1869
Information
Owned by: Trinity House

Wolf Rock Lighthoue stands on the Wolf Rock, a single rock located 8 nautical miles south-west of Land's End and 18 nautical miles east of St Mary's in the Isles of Scilly, in Cornwall.[1]

The fissures in the rock are said to produce a howling sound in gales, hence the name ;Wolf Rock'.[2][3][4]

The lighthouse stands 380 feet high, constructed from Cornish granite prepared at Penzance, on the mainland of Cornwall. It took eight years, from 1861 to 1869, to build due to the treacherous weather conditions that can occur between the Cornish mainland and the Isles.[5]

The light is visible from Land's End by day and night. It has a range of 23 nautical miles and was automated in 1988. The lighthouse was the first in the world to be fitted with a helipad.[6]

Geology

Situated between Cornwall and the Isles of Scilly, the Wolf Rock is a small plug of phonolitic lava formed during the early part of the Cretaceous period and is unlike any rock exposed on the Cornish mainland.[7]

History

Engineering drawing showing the structure of Wolf Rock Lighthouse

The Gabrielle of Milford Haven was wrecked on the Wolf Rock in 1394. Her cargo, worth £1000, was washed ashore in Cornwall and collected as wreck.[8]

Earlier seamarks

In 1790, the Corporation of Trinity House received a patent of the Crown to build a lighthouse on Wolf Rock. The rights were leased to a Lt. Henry Smith; but (such were the technical challenges of the venture) the project was transferred to the less exposed location of the Longships, where construction of a lighthouse proceeded.[9] On Wolf Rock, rather than a lighthouse, Lt. Smith went on to build a wrought iron daymark 20 feet high, 4 inches in diameter and supported by six stays. A metal effigy of a wolf was placed on top. By 1795 the daymark, had been washed away.

In the late 1830s John Thurburn built a beacon, which was completed on 15 July 1840:

PENZANCE, July 16.— The beacon on the Wolf Rock was completed yesterday; it is a cone of 18 feet at the base, and is surmounted by a lantern of six feet in diameter; the total elevation above the surface of the rock Is 46 feet.[10]
At the close of the proceedings, the Commission having been informed by Mr. Pearce, agent to Lloyds that the exertions of the Trinity Board at the Wolf Rock had been crowned with success in the erection of a cast iron beacon, which had been completed only the preceding night, embarked on board the steamer accompanied by Mr. Pearce, to inspect it, when they expressed their decided approbation of the manner in which the work had been accomplished. The rock was at half tide; and the base of the beacon, which 18 feet in diameter, is about 7 feet above low water, spring tide. It is a cone composed of 10 courses of 2 feet 2 inches and an eleventh course of 3 feet, giving about 23 feet perpendicular height - This is surmounted by a strong oak mast of 34 feet, 11 of which are imbedded in the cone A ball of copper hoops, of 6 feet diameter, crowns the whole, giving a total elevation of 53 feet above low water and about 35 feet above high water at spring tides; and although nearly three leagues off, it is distinctly visible from the western land. The Beacon is painted read and white, in horizontal stripes.[11]

In November of that year, the beacon was wrecked by storms: the pole and globe on its top were washed away.[12] It was not replaced until 1842, but they were once more washed away in a storm on 9 October 1844.

Trinity House engineer James Walker constructed a cone-shaped beacon 14 feet high, which took five years to build. Made of iron plates and filled with concrete rubble this was completed in 1848,[13] it can still be seen next to the lighthouse.

Construction of the lighthouse

In April 1860, Trinity House applied to the Board of Trade for funds to build a lighthouse on Wolf Rock.[14] Approval was given and Walker, as engineer-in-chief, drew up designs for a 117-foot masonry tower, tapering in diameter from 41 feet 8 inches at the base to 17 feet at the top. Details of the design followed closely that of other Walker-built lighthouses: the recently completed Bishop Rock and Hanois lights, and the Smalls (which was then nearing completion). While his designs were inspired by Smeaton's third Eddystone Lighthouse, Walker introduced new innovations, not least the use of vertical as well as horizontal dovetail joints (first achieved at Les Hanois at the suggestion of Nicholas Douglass, and likewise incorporated into the design of Wolf Rock).[15]

Nicholas's son James Douglass was appointed as resident engineer, and in July 1861 he arrived (fresh from completing his work as resident engineer for the Smalls lighthouse) and surveyed the rock.[15] The following March work began on excavating the foundations. In October 1862, James Walker died (at the age of 81). James Douglass replaced him as engineer-in-chief to the Trinity House; James's younger brother, William Douglass, then became resident engineer at Wolf Rock.[16] William himself laid the first stone of the new tower on 6 August 1864. Masonry construction was completed on 19 July 1869.[17] The finished tower was topped by a lantern storey manufactured by Chance Brothers of Smethwick to James Douglass's design. The lantern had previously been exhibited at the Paris Exhibition of 1867 as an example of the latest in lantern technology, using curved rather than flat panes of glass and helical rather than straight glazing bars.

Engineering drawing of the 1869 optic

James Chance of Chance Brothers had designed a large (first-order) rotating multi-panel optic for installation in the tower, 8½ feet high by 5½ feet diameter.[18] In order to differentiate the light from the nearby St Agnes Lighthouse (which displayed a white light) and from Les Hanois Lighthouse (which displayed a red light) it was resolved that the Wolf Rock light should revolve and flash alternately red and white; in order to achieve the required characteristic it was planned to install 'ruby' coloured panes of glass over half the panels on the optic (with the intervening panels left clear).[19] It was known, however, that the intensity of a light was reduced when shone through coloured glass, so Chance conducted experiments to measure the precise difference.[19] It was concluded that the comparative intensity of clear glass to red was 21 to 9; therefore the red-covered panels on the optic were made wider than the others by the same proportion, in order to maintain an even intensity across the colour-change.

Operational summary

The light first shone on 1 January 1870; as planned, it displayed "alternate flashes of red and white of equal intensity every thirty seconds".[20] The completed optic (which together with its pedestal stood 20 feet high) was described by Douglass as "probably the most perfect for the purpose that has yet been constructed"; it continued in use for the next eighty-five years. The optic was rotated by a clockwork drive, that required winding every four hours.[18] A 7-cwt bell, hung from the lantern gallery, was sounded in fog; driven by a separate clockwork mechanism, it rang three times every fifteen seconds.[21]

The Wolf Rock was the site of a hake fishery in the 1870s, especially by fishermen from St Ives with 400 employed in October 1879.[22]

In 1904 a more powerful light-source was installed: a Matthews incandescent oil burner replacing the Douglass multi-wick oil burner. At the same time a reed fog signal was installed, which sounded a four-second blast every 30 seconds using compressed air produced by a small steam engine with a coke and coal-fired boiler;[21] it remained in use until the 1960s. (The bell was initially retained for standby use, but was decommissioned in 1906.)[23] The light characteristic was changed in 1906, so that the flash (red or white, alternating as before) was displayed every fifteen seconds rather than every thirty.[24]

In March 1941 the lantern was hit by aerial cannon fire, shattering the glass of the lenses.[25] For a time afterwards the red flash was removed and it simply flashed white, every thirty seconds.[26] The lighthouse was equipped with a radiotelephone in 1941, which greatly improved communications; it came with a petrol-driven generator for recharging its batteries.[27] On 18 December 1944, German submarine U-1209 hit Wolf Rock and was subsequently scuttled with the loss of 9 lives.

In 1955 electrification came to Wolf Rock Lighthouse: in place of the oil lamp a 1 kW tungsten filament lamp was installed, within a new fourth-order catadioptric optic (again made by Chance Brothers);[28] the optic was provided with a new clockwork-driven revolving pedestal. 100V DC power for the light was provided by Crompton Parkinson generators, driven by Ruston-Hornsby diesel motors, which were installed in what had been the coal store.[29] The new optic maintained the same light characteristic as the old, flashing (alternately red and white) every fifteen seconds.[30] It was a four-sided optic, made up of two wide lens panels and two narrow ones (the wider panels being fronted with ruby glass), so that the intensity of the red light would, as before, be equivalent to that of the white.[29] The visible range of the light was 16 nautical miles. An automatic lamp changer was fitted, including an emergency battery lamp in case the generator sets should fail; but provision was also made for the substitution of a multi-wick oil burner in the event of a complete electrical failure, for which a pressurised paraffin supply system was retained.[29]

In the early 1960s a new diaphone fog signal was installed in place of the old reed fog horn;[31] powered by a pair of Lister diesel compressor sets, it was one of the last diaphone systems to be installed by Trinity House.[29]

In 1972 Wolf Rock became the first lighthouse in the world to be fitted with a helipad; completed the following year, it greatly eased the challenge of getting keepers to and from the lighthouse in heavy seas. Nevertheless, fifteen years later the lighthouse became fully automated:[2] the last keepers left Wolf Rock on 3 June 1987, after which the automation crew took over, remaining on the lighthouse until July the following year, whereupon the automation process was complete. During automation the red colour was removed from the light and the fourth-order optic was adapted so as to display one white flash every fifteen seconds. A more powerful lamp was fitted, which increased the range of the light to 23 nautical miles. Also, an electric emitter replaced the diaphone fog signal at this time,[21] Fifteen years later the lighthouse was converted to solar power, with photovoltaic cells being installed around the exterior of the helideck support structure.[18]

Present day

The lighthouse continues in operation. Set within the fourth-order revolving optic,[32] its solar-powered lamp has a range of 16 nautical miles; it flashes once every 15 seconds and is remotely monitored from the Trinity House Planning Centre in Harwich, Essex.[33]

MV Mazarine

The ro-ro vessel MV Mazarine grounded near the lighthouse on 10 July 2023, while on a voyage from Ireland to Zeebrugge, Belgium following a loss of power. Managing to clear the rock, Mazarine was initially unable to start the engines and drifted towards Mount's Bay. At around 16:00 hours a tug provided a tow to Falmouth Bay, where the ship underwent a dive survey and was drydocked for repairs. The hull required extensive repairs on the port side aft in order to close up multiple hull perforations and replace deformed plating.[34][35]

Popular culture

The Wolf Rock Lighthouse features prominently in the 1925 Dr Thorndyke detective novel, The Shadow of the Wolf, by R. Austin Freeman.[36]

Pictures

 ("Wikimedia Commons" has material
about Wolf Rock Lighthouse)
  • Wolf Rock Lighthouse in 1875
    Wolf Rock Lighthouse in 1875
  • Wolf Rock Beacon, 1884, by E. Price Edwards
    Wolf Rock Beacon, 1884, by E. Price Edwards
  • A keeper arriving, c. 1913
    A keeper arriving, c. 1913
  • Wolf Rock seen from Land's End
    Wolf Rock seen from Land's End

Outside links

References

  1. ↑ Admiralty Chart 1148: Isles of Scilly to Lands End.
  2. ↑ Jump up to: 2.0 2.1 Jones, Robin (2011). Lighthouses of the South West. Wellington, Somerset: Halsgrove. ISBN 978-0-85704-107-4. 
  3. ↑ Rowlett, Russ: Lighthouses of Southwest England (Devon and Cornwall) – The Lighthouse Directory (University of North Carolina at Chapel Hill)
  4. ↑ Wolf Rock Lighthouse Trinity House. Retrieved 24 April 2016
  5. ↑ Rowlett, Russ: Lighthouses of Southwest England (Devon and Cornwall) – The Lighthouse Directory (University of North Carolina at Chapel Hill)
  6. ↑ Trinity House: Wolf Rock
  7. ↑ Hall, Anthony (1994). J T Greensmith. ed. West Cornwall. Geologists' Association Guide No. 19 (Second ed.). The Geologists' Association. ISBN 0-900717-57-2. 
  8. ↑ St Levan Local History Group (2004). The Book of St Levan. Tiverton: Halsgrove. ISBN 1-84114-328-6. 
  9. ↑ Nicholson, Christopher P. (1995). Rock Lighthouses of Britain: The End of an Era?. Caithness, Scotland: Whittles. p. 68. 
  10. ↑ 'Ship News' in the London Evening Standard, 18 July 1840
  11. ↑ 'Penzance': Royal Cornwall Gazette 24 July 1840
  12. ↑ 'The Wolfe-Rock': Royal Cornwall Gazette 27 November 1840
  13. ↑ 'the Wolf-Rock Lighthouse': Royal Cornwall Gazette 11 April 1862
  14. ↑ Nicholson, Christopher P. (1995). Rock Lighthouses of Britain: The End of an Era?. Caithness, Scotland: Whittles. pp. 139–145. 
  15. ↑ Jump up to: 15.0 15.1 Nancollas, Tom (2018). Seashaken Houses: a Lighthouse History from Eddystone to Fastnet. London: Penguin Random House. p. 139. 
  16. ↑ "Life of William Douglass M.INST.C.E.". uslhs.org. http://uslhs.org/sites/default/files/attached-files/Life%20of%20William%20Douglass.pdf. 
  17. ↑ "The Great Wolf Rock", Liverpool Mercury, 23 July 1869 
  18. ↑ Jump up to: 18.0 18.1 18.2 Raby, A. C.; Pappas, A.; Dassanayake, D. T.; Brownjohn, J. M. W.; D'Ayala, D.; Antonini, A. (2019). "Wolf Rock lighthouse: past developments and future survivability under wave loading". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences (The Royal Society) 377 (2155). doi:10.1098/rsta.2019.0027. PMID 31424349. Bibcode: 2019RSPTA.37790027R. 
  19. ↑ Jump up to: 19.0 19.1 Chance, James Frederick (1902). The Lighthouse Work of Sir James Chance, Baronet. London: Smith, Elder & co.. https://uslhs.org/sites/default/files/attached-files/The%20Lighthouse%20Work%20of%20Sir%20James%20T.%20Chance.pdf. Retrieved 24 February 2019. 
  20. ↑ London Gazette, Issue: 23578, Page: 338, 18 January 1870.
  21. ↑ Jump up to: 21.0 21.1 21.2 Renton, Alan (2001). Lost Sounds: The Story of Coast Fog Signals. Caithness, Scotland: Whittles. 
  22. ↑ "St Ives". The Cornishman (65): p. 5. 9 October 1879. 
  23. ↑ London Gazette, Issue 27902, Page 2441, 6 April 1906
  24. ↑ London Gazette, Issue: 27883, Page: 880, 6 February 1906.
  25. ↑ Beaver, Patrick (1971). A History of Lighthouses. London: Peter Davies. p. 111. 
  26. ↑ Harnack, Edwin P. (1952). All About Ships & Shipping: a Handbook of Popular Nautical Information. London: Faber & Faber. p. 181. 
  27. ↑ Edmonds, E. W. A. (2004). "The Lizard Goes Electric". The Journal of the Trevithick Society (31): 3–28. 
  28. ↑ Raby A. C., Antonini A., Pappas A., Dassanayake D. T., Brownjohn J. M. W. and D'Ayala D. 2019 "Wolf Rock lighthouse: past developments and future survivability under wave loading." Phil. Trans. R. Soc. A. 377: 2019.0027
  29. ↑ Jump up to: 29.0 29.1 29.2 29.3 Boyle, Martin (1997). Lighthouses of England and Wales: Wolf Rock. Southampton, Hants.: B & T Publications. p. 36. 
  30. ↑ Jackson, Derrick (1975). Lighthouses of England and Wales. Newton Abbott, Devon: David & Charles. pp. 42–44. 
  31. ↑ Woodman, Richard; Wilson, Jane (2002). The Lighthouses of Trinity House. Bradford-on-Avon, Wilts.: Thomas Reed. pp. 183–186. 
  32. ↑ "Photograph". Flash (20): 9. Winter 2013. https://www.trinityhouse.co.uk/asset/1317/download?1457365928. Retrieved 21 March 2019. 
  33. ↑ "Wolf Rock Lighthouse". https://www.trinityhouse.co.uk/lighthouses-and-lightvessels/wolf-rock-lighthouse. 
  34. ↑ Morwood, Ryan. "RNLI volunteer's 15-hour rescue operation of Mazarine". Falmouth Packet. https://www.falmouthpacket.co.uk/news/23648497.rnli-volunteers-15-hour-rescue-operation-mazarine/. 
  35. ↑ "To Prevent a Serious Grounding, Ro/Ro's Engineers Tried "Impossible" Fix". https://maritime-executive.com/article/to-prevent-a-serious-grounding-ro-ro-engineers-tried-impossible-fix. 
  36. ↑ Work available at Project Gutenberg Australia (retrieved 12/03/2014)
Lighthouses of Trinity House

Great Britain:
Anvil Point • Bamburgh • Bardsey • Beachy Head • Berry Head • Bishop Rock • Bull Point • Caldey Island • Coquet • Cromer • Crow Point • Dungeness • Eddystone • Farne • Flamborough • Flatholm • Godrevy • Hartland Point • Hilbre Island • Holyhead • Hurst Point • Guile Point East • Heugh Hill • Lizard • Longships • Longstone • Lowestoft • Lundy North • Lundy South • Lynmouth Foreland • Monkstone • Mumbles • Nab Tower • Nash Point • Needles • North Foreland • Pendeen • Peninnis • Point Lynas • Portland Bill • Round Island • Royal Sovereign • Skerries • Skokholm • Smalls • South Bishop • South Stack • Southwold • St Anthony's • St Bees • St Tudwal's • St Anns Head • St Catherines • Start Point • Strumble Head • Tater Du • Trevose Head • Trwyn Du • Whitby • Wolf Rock

Channel Islands and Gibraltar:

Casquets • Europa Point • Les Hanois • Sark

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