St Catherine's Lighthouse

St. Catherine's Lighthouse
The lighthouse, with fog-signal tower attached
Map
LocationSt Catherine's Point
Isle of Wight
England
OS gridSZ4981275339
Coordinates50°34′32.4″N 1°17′51.9″W / 50.575667°N 1.297750°W / 50.575667; -1.297750
Tower
Constructedc. 1323 (first)
Constructionashlar
Automated1997
Height27 m (89 ft)
Shapeoctagonal tower
Markingswhite tower and lantern
OperatorTrinity House[1]
HeritageGrade II listed building Edit this on Wikidata
Light
First lit1838 (current)
Focal height41 m (135 ft)
Light sourceLED
Intensity821,000 candela
Range25 nmi (46 km; 29 mi)
CharacteristicFl W 5s.

St Catherine's Lighthouse is a lighthouse located at St Catherine's Point at the southern tip of the Isle of Wight. It is one of the oldest lighthouse locations in Great Britain.

Origins

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The first lighthouse was established on St Catherine's Down in 1323 on the orders of the Pope, after a ship ran aground nearby and its cargo was either lost or plundered. Once part of St Catherine's Oratory, its octagonal stone tower can still be seen today on the hill to the west of Niton. It is known locally as the "Pepperpot".[2] Nearby there are the footings of a replacement lighthouse begun in 1785, but this was never completed because the hill is prone to dense fog.[3] It is sometimes called the "salt pot".[4]

History

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The lighthouse c.1910

The new lighthouse, built by Trinity House in 1838, was constructed as a 40-metre (130 ft) stone tower. When first built the light was oil-fuelled; its lamp, with four concentric wicks, was set within a large (first-order) fixed dioptric lens, built by Cookson & co. and surmounted by 250 mirrors (which were later replaced with prisms).[5] It was first lit on 1 March 1840;[6] however, the light was often obscured by fog, which led in due course to the height of the tower being reduced by 13-metre (43 ft) in 1875. At the same time the lamp was replaced with a six-wick mineral-oil burner,[7] and a system of 'dioptric mirrors' (prisms) was installed to redirect light from the landward side of the lamp out to sea.[8]

In 1868 a Daboll trumpet fog signal was installed in a building on the cliff edge;[9] it used an Ericsson 4 hp caloric engine to sound a reed attached to an acoustic horn, once every 20 seconds.[10] In October 1876, the reed was changed to a more powerful siren which sounded two blasts every four minutes.[10]

In the 1880s the decision was taken to convert the St Catherine's light to electric power. In 1888 a carbon arc lamp was installed, linked to a powerful set of De Méritens magneto-electric machines, powered by three Robey non-condensing compound steam engines. (St Catherine's was the last English lighthouse to be provided with an arc lamp).[11] A new optic was also provided (a second-order 16-sided revolving dioptric lens array by Chance & co.)[12] which showed a five-second flash every thirty seconds. At the time of its inauguration St Catherine's was claimed to be 'the most powerful electric light in the world'.[13] The oil lamp was retained for use in emergencies, but in 1905 it was remarked that it had never had to be employed, as the electrical system had never failed in the seventeen years since its installation.[14]

As well as a new Engine House, more cottages were built, to accommodate the additional staff required to operate the generating plant.[15] A new fog signal house was also built in 1888; in it a pair of double-noted 5-inch sirens were installed, sounding through a pair of upright horns, which emerged through the roof and were angled out to sea.[16] Compressed air for the sirens was piped underground from the engine house, where the three engines were linked to an air compressor by way of a common drive shaft;[17] compressed air was also used to power the mechanism that turned the lens. The sirens sounded two blasts every minute: a higher note followed by a low note.[15]

View of the lighthouse, looking south-west out to the English Channel

From 1890 a narrow red sector was added to the light, to warn vessels from approaching too near to the shore west of St Catherine's Point.[18] In addition to the flashing light showing red in this direction, a subsidiary apparatus redirected a fixed beam of light upwards from the rear of the main lens and reflected it to shine red in the same direction.[8]

In 1901 a series of trials of different sirens and reeds attached to trumpets of different sizes and designs took place at St Catherine's (which had sufficient engine power to produce the required volume of compressed air). The tests were overseen by Lord Rayleigh, scientific adviser to Trinity House, whose distinctive and eponymous design of fog signal trumpet was installed at several different fog signal stations (though not at St Catherine's itself) in the wake of the trials.[17]

The 2nd Order Fresnel lens in 2019

In 1904 the 16-sided optic was removed from St Catherine's (and installed instead in South Foreland Lighthouse). A new, more powerful 4-sided optic, manufactured by Chance Brothers, was installed in its place.[19] The new apparatus, borne on a trough of mercury and driven by a large clockwork mechanism,[20] revolved much faster to give a much quicker flash, once every five seconds.[21] It was said at the time to be 'the most powerful flash-light in [the] country', at 15,000,000 candlepower (compared to the 3,000,000 candlepower formerly produced by the old lens).[20] The beam (albeit reflected on the clouds) could often be seen from Barfleur, 60 miles away.[22] As part of the 1904 upgrade, the red sector light was reconfigured to shine from a window lower down in the tower, 20 ft (6.1 m) below the lantern; it continued to use light redirected from the landward side of the main lamp, by way of a series of lenses and prisms.[23] The same arc lamps remained in use as formerly (one being kept on standby while the other was in operation), and in the engine room the Robey engines and De Méritens alternators were likewise retained.[14]

The arc lamp was decommissioned in the 1920s; by this time it was the last operational arc lamp in a lighthouse in the UK (it is now displayed as an exhibit in Southsea Castle.)[24] It was replaced by a 4 kW filament lamp powered by mains electricity; an automatic lamp changer was provided, to engage a standby electric lamp in the event of a bulb failure (and a standby acetylene lamp in the event of a power failure). The 1904 optic was retained, with the addition of an electric winder to the clockwork rotation drive.[25]

By 1932 the fog horn house was being undermined by erosion; it was demolished and a second (smaller) tower was then built alongside the lighthouse to house a new more powerful 12-inch siren. On 1 June 1943 a bombing raid destroyed the engine house, killing the three duty keepers.[26] As part of the post-war repairs, a diaphone was installed in place of the siren. This was itself replaced by a 'supertyfon' air horn in 1962, when new engines and compressors were also installed; the fog signal was discontinued in 1987.[17]

Up until 2021 the 1904 revolving optic remained in use; the lighthouse had a range of 25 nautical miles (46 km; 29 mi) and was the third-most powerful of all the lights maintained by Trinity House.[27] In November 2020, however, the Isle of Wight Council granted Trinity House planning consent for "removal of existing lens, light pedestal, service stage railings and cleaning platform from lantern room; replacement platform, railings and stationary led light on pedestal".[28]

Present day

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The lantern room after removal of the Fresnel lens, October 2021

In July 2021, Trinity House issued a Notice to Mariners reducing the light's nominal range from 25 nm to 19 nm.[29] As of October 2021, the second order Fresnel lens system has been removed and the lantern room is empty; according to Trinity House the lens has been 'placed into storage while we look into options'.[30] A temporary LED lamp has been installed externally, pending installation of new equipment inside the lantern.

A red sector light, shown from a window lower in the tower, marks Atherfield Ledge.[27]

A team of volunteers used to provide tours of the lighthouse year round; however in January 2020 Trinity House announced that St Catherine's lighthouse would have to 'close its doors to the visiting public as a tourist attraction' claiming that it was no longer economically viable to keep the visitor centre open.[31] Cottages around the lighthouse can be rented out as holiday accommodation.

A T-antenna is spun between the lighthouse and a mast for transmitting DGPS-signals on 307.5 kHz.

See also

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References

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  1. ^ Rowlett, Russ. "Lighthouses of Southern England". The Lighthouse Directory. University of North Carolina at Chapel Hill. Retrieved 26 April 2016.
  2. ^ Woodman and Wilson (2002). The Lighthouses of Trinity House. Bradford on Avon: Reed. ISBN 1-904050-00-X.
  3. ^ "History of the lighthouse at St Catherine's Point". National Trust. Archived from the original on 10 December 2017. Retrieved 1 May 2019.
  4. ^ "A colourful history behind St Catherine's Oratory". National Trust. Archived from the original on 1 May 2019. Retrieved 1 May 2019.
  5. ^ Davenport Adams, W. H. (1891). The Story of our Lighthouses and Lightships: Descriptive and Historical (PDF). London, Edinburgh & New York: Thomas Nelson & Sons. p. 122. Archived (PDF) from the original on 3 May 2017. Retrieved 27 February 2019.
  6. ^ "Lighthouse management : the report of the Royal Commissioners on Lights, Buoys, and Beacons, 1861, examined and refuted Vol. 2". 1861. p. 81. Archived from the original on 4 April 2016. Retrieved 3 March 2019.
  7. ^ Jackson, Derrick (1975). Lighthouses of England and Wales. Newton Abbott, Devon: David & Charles. p. 65.
  8. ^ a b "1892 Institution of Mechanical Engineers: Visits to Works (13: St Catherine's Lighthouse)". Grace's Guide. Archived from the original on 6 March 2019. Retrieved 3 March 2019.
  9. ^ Elliot, George H. (1875). European Light-House Systems. London: Lockwood & co. p. 133. Archived from the original on 29 October 2020. Retrieved 10 March 2019.
  10. ^ a b "Fog Signals". Parliamentary Papers, Volume LXIV. 23 (337): 2–4. 1 August 1879.
  11. ^ Schiffer, Michael Bryan (2008). Power Struggles: Scientific Authority and the Creation of Practical Electricity before Edison. Cambridge, Massachusetts: MIT Press. p. 278.
  12. ^ Chance, James Frederick (2018). A History of the Firm of Chance Brothers & Co. Sheffield: Society of Glass Manufacturers. p. 178.
  13. ^ "Saint Catherine's Point Lighthouse". The Engineer. LXV: 479–480. 15 June 1888.
  14. ^ a b "Improvements in English Lighthouses". The Engineer. XCIX: 362–363. 14 April 1905.
  15. ^ a b Woodman, Richard; Wilson, Jane (2002). The Lighthouses of Trinity House. Bradford-on-Avon, Wilts.: Thomas Reed. pp. 96–97.
  16. ^ "postcard image". Archived from the original on 14 March 2013. Retrieved 22 February 2020.
  17. ^ a b c Renton, Alan (2001). Lost Sounds: The Story of Coast Fog Signals. Caithness, Scotland: Whittles.
  18. ^ London Gazette, Issue 26038, Page 1975, 1 April 1890
  19. ^ s:1911 Encyclopædia Britannica/Lighthouse
  20. ^ a b "St Catherine's Electric Lighthouse". The Electrical Review. 55 (1414): 1076. 30 December 1904.
  21. ^ London Gazette, Issue 27720, Page 6452, 7 October 1904
  22. ^ "Lighthouses and the Optical Apparatus used in them". Proceedings of the Optical Convention (1): 377. 1926.
  23. ^ Talbot, Frederick A. (1913). Lightships and Lighthouses. London: William Heinemann.
  24. ^ "Southsea Castle Lighthouse". Waymarking.com. Archived from the original on 1 April 2019. Retrieved 16 March 2019.
  25. ^ Cooper, F. W. (1979). Twenty Years in Lighthouses (PDF). United States Lighthouse Society. pp. 10–14. Retrieved 13 March 2019.
  26. ^ "St Catherine's Lighthouse". Red Funnel. Archived from the original on 26 March 2019. Retrieved 26 March 2019.
  27. ^ a b "St Catherine's Lighthouse". Trinity House. Archived from the original on 6 March 2019. Retrieved 3 March 2019.
  28. ^ "20/01316/LBC - Listed Building Consent for works to lighthouse to include removal of existing lens..." Isle of Wight Council.
  29. ^ "11/2021 St. Catherine's Lighthouse - Trinity House". Trinity House.
  30. ^ Perry, Sally (28 January 2022). "100-year-old lamp and lenses now removed from St Catherine's Lighthouse as part of modernisation". OnTheWight News. Retrieved 10 February 2022.
  31. ^ "St Catherine's Lighthouse closes its doors to visitors and unlikely to reopen". On The Wight. 7 January 2020. Retrieved 1 April 2020.
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