Skerryvore
Encyclopedia
Skerryvore is a remote reef that lies off the west coast of Scotland, 12 miles (19 kilometres) south west of the island of Tiree
Tiree
-History:Tiree is known for the 1st century BC Dùn Mòr broch, for the prehistoric carved Ringing Stone and for the birds of the Ceann a' Mhara headland....

. Skerryvore is also the name given to the lighthouse
Lighthouse
A lighthouse is a tower, building, or other type of structure designed to emit light from a system of lamps and lenses or, in older times, from a fire, and used as an aid to navigation for maritime pilots at sea or on inland waterways....

 on the skerry, built with some difficulty between 1838 and 1844 by Alan Stevenson
Alan Stevenson
Alan Stevenson FRSE MInstCE was a Scottish lighthouse engineer who was Engineer to the Board of Northern Lighthouses...

.

At a height of 156 feet (48 m) it is the tallest lighthouse in the United Kingdom. The shore station was at Hynish on Tiree
Tiree
-History:Tiree is known for the 1st century BC Dùn Mòr broch, for the prehistoric carved Ringing Stone and for the birds of the Ceann a' Mhara headland....

 (which now houses the Skerryvore Lighthouse Museum), operations being later transferred to Erraid
Erraid
The Isle of Erraid is a tidal island approximately one mile square in area located in the Inner Hebrides of Scotland. It lies west of Mull and southeast of Iona. The island receives about of rain and 1,350 hours of sunshine annually, making it one of the driest and sunniest places on the western...

, west of Mull
Isle of Mull
The Isle of Mull or simply Mull is the second largest island of the Inner Hebrides, off the west coast of Scotland in the council area of Argyll and Bute....

. The remoteness of the location led to the keepers receiving additional payments in kind. The light shone without a break from 1844 until a fire in 1954 shut down operations for five years. The lighthouse was automated in 1994.

Geology

In pre-historic times the rocks that now form Skerryvore were covered by the ice sheets that spread from Scotland out into the Atlantic Ocean beyond the Outer Hebrides
Outer Hebrides
The Outer Hebrides also known as the Western Isles and the Long Island, is an island chain off the west coast of Scotland. The islands are geographically contiguous with Comhairle nan Eilean Siar, one of the 32 unitary council areas of Scotland...

. After the last retreat of the ice around 20,000 years ago, sea levels were up to 400 feet (122 m) lower than at present. Although the isostatic
Isostasy
Isostasy is a term used in geology to refer to the state of gravitational equilibrium between the earth's lithosphere and asthenosphere such that the tectonic plates "float" at an elevation which depends on their thickness and density. This concept is invoked to explain how different topographic...

 rise of land makes estimating post-glacial coastlines a complex task, circa 14,000 BP
Before Present
Before Present years is a time scale used in archaeology, geology, and other scientific disciplines to specify when events in the past occurred. Because the "present" time changes, standard practice is to use AD 1950 as the origin of the age scale, reflecting the fact that radiocarbon...

 it is likely that the reef was at the south western end of a large island consisting of the modern islands of Tiree and Coll
Coll
Coll is a small island, west of Mull in the Inner Hebrides of Scotland. Coll is known for its sandy beaches, which rise to form large sand dunes, for its corncrakes, and for Breachacha Castle.-Geography and geology:...

 and the surrounding land.

Steadily rising sea levels would then have slowly isolated and finally all but submerged the shoals of Skerryvore, a barrier of innumerable metamorphic
Metamorphic rock
Metamorphic rock is the transformation of an existing rock type, the protolith, in a process called metamorphism, which means "change in form". The protolith is subjected to heat and pressure causing profound physical and/or chemical change...

 remnants that stretch for 8 miles (13 kilometres) lying in a south-westerly direction. A detailed survey undertaken in 1834 listed more than 130 main rocks including Am Bonn Sligheach (Boinshley) and Am Bogha Ruadh .

The rocks have been worn smooth by the action of the waves and are constantly affected by spray. Alan Stevenson wrote: "The effect of the jet d'eau was at times extremely beautiful, the water being so broken as to form a snow-white and opaque pillar, surrounded by a fine vapour in which, during sunshine, beautiful rainbows were observed ".

It is an isolated outpost of the Inner Hebrides
Inner Hebrides
The Inner Hebrides is an archipelago off the west coast of Scotland, to the south east of the Outer Hebrides. Together these two island chains form the Hebrides, which enjoy a mild oceanic climate. There are 36 inhabited islands and a further 43 uninhabited Inner Hebrides with an area greater than...

 archipelago
Archipelago
An archipelago , sometimes called an island group, is a chain or cluster of islands. The word archipelago is derived from the Greek ἄρχι- – arkhi- and πέλαγος – pélagos through the Italian arcipelago...

 composed of Lewisian gneiss
Lewisian complex
The Lewisian complex or Lewisian Gneiss is a suite of Precambrian metamorphic rocks that outcrop in the northwestern part of Scotland, forming part of the Hebridean Terrane. These rocks are of Archaean and Paleoproterozoic age, ranging from 3.0–1.7 Ga. They form the basement on which the...

, formed in the Precambrian
Precambrian
The Precambrian is the name which describes the large span of time in Earth's history before the current Phanerozoic Eon, and is a Supereon divided into several eons of the geologic time scale...

 eon, these rocks being amongst the most ancient rocks in Europe. A further hazard to shipping is a magnetic anomaly
Magnetic anomaly
In geophysics, a magnetic anomaly is a local variation in the Earth's magnetic field resulting from variations in the chemistry or magnetism of the rocks. Mapping of variation over an area is valuable in detecting structures obscured by overlying material...

 in the area.

Surveys

Between 1790 and 1844 more than thirty ships were known to have been wrecked in the area. Robert Stevenson
Robert Stevenson (civil engineer)
Robert Stevenson FRSE MInstCE FSAS MWS FGS FRAS FSA was a Scottish civil engineer and famed designer and builder of lighthouses.One of his finest achievements was the construction of the Bell Rock Lighthouse.-Early life:...

, chief engineer of the Northern Lighthouse Board
Northern Lighthouse Board
The Northern Lighthouse Board is the General Lighthouse Authority for Scotland and the Isle of Man. It is a non-departmental public body responsible for marine navigation aids around coastal areas.-History:...

 (NLB) landed on the reef in 1804 and reported on the need for a beacon of some kind there. In 1814 he returned in the company of Sir Walter Scott
Walter Scott
Sir Walter Scott, 1st Baronet was a Scottish historical novelist, playwright, and poet, popular throughout much of the world during his time....

 and a party of NLB Commissioners. Scott wrote:
Later that year an Act of Parliament
Act of Parliament
An Act of Parliament is a statute enacted as primary legislation by a national or sub-national parliament. In the Republic of Ireland the term Act of the Oireachtas is used, and in the United States the term Act of Congress is used.In Commonwealth countries, the term is used both in a narrow...

 was passed enabling construction of a lighthouse, yet despite pleas for a light arriving almost weekly at the NLB, events proceeded only slowly. It was not until 1834 that Robert Stevenson returned in the company of his son Alan
Alan Stevenson
Alan Stevenson FRSE MInstCE was a Scottish lighthouse engineer who was Engineer to the Board of Northern Lighthouses...

. A painstaking survey made it clear that there was little choice for a location. The single largest area was a rock that measured only 280 sq ft (26 m²) at low tide. Readings for wave pressure indicated that any tower would have to withstand forces of 6000 lb/sqft. There were suggestions that a tower of cast iron or bronze might be sufficient, but Stevenson senior wrote that "no pecuniary consideration could in my opinion have justified the adoption of an iron lighthouse for Skerryvore." On more than one occasion the surveyors had to warn passing vessels of the danger. A ship from Newcastle
Newcastle upon Tyne
Newcastle upon Tyne is a city and metropolitan borough of Tyne and Wear, in North East England. Historically a part of Northumberland, it is situated on the north bank of the River Tyne...

, whose charts showed only the main rock some miles away, was boarded near Bo Ruadh. The Master, oblivious to the dangers, was found lying at ease smoking a pipe with his wife beside him knitting stockings.

Still the Commissioners prevaricated, daunted by the potential costs, estimated by Robert Stevenson at £63,000. They set up a special Skerryvore Committee, whose members decided to visit the site by steamer to see for themselves. Just off Skerryvore a fire broke out in the boiler room crippling the ship. It was extinguished and no harm was done, but the experience may have been persuasive.

Alan Stevenson was duly appointed as the engineer for the project aged only 30. He designed a tower 138 feet (42 m) high with a base of 42 feet (13 m), narrowing to just 16 feet (5 m) at the lantern gallery. The lowest sections would be solid, although at 26 feet (8 m)  feet high they were less than half the height of the base of the later light at nearby Dubh Artach
Dubh Artach
Dubh Artach is a remote skerry of basalt rock off the west coast of Scotland lying west of Colonsay and south-west of the Ross of Mull.A lighthouse designed by Thomas Stevenson with a tower height of was erected between 1867 and 1872 with a shore station constructed on the isle of Erraid...

. Nonetheless the structure would weigh 4308 long tons (4,377 t) and the volume of the base would be more than 4 times larger than the entire structure of the Eddystone
Eddystone
See also Eddystone Rock, Falklands Islands and Eddystone, PennsylvaniaThe Eddystone, or the Eddystone Rocks, are a seaswept group of rocks situated some 9 statute miles south west of Rame Head in Cornwall, England, United Kingdom...

 light and twice that of the Bell Rock
Inchcape
Inchcape or the Bell Rock is a notorious reef off the east coast of Angus, Scotland, near Dundee and Fife . Bell Rock Lighthouse, an automatic lighthouse, occupies the reef...

. With 151 steps to the top it would be the tallest and heaviest lighthouse yet built anywhere in the modern world, and today it is still the tallest lighthouse in the United Kingdom.

Shore station

Hynish on Tiree was the initial shore station and construction site. Located on the south west corner of Tiree, its proximity to Skerryvore and the resulting abundance of bounty from the wrecks, led to rentals being higher here and on the rest of the west coast than elsewhere on the island. Work on the new facilities began in 1837; granite blocks were quarried from Mull and brought to the village to be cut and shaped before being shipped out to the reef. Several cottages for the keepers were built in 1844 from the same stone as well as a massive pier and a tall granite tower to enable signalling to and from Skerryvore itself. Stevenson remarked that the hive of activity there contrasted with the "desolation and misery" he imagined to be the lot of the surrounding population.

Barrack and foundation

In 1838 £15,000 in wages alone was spent on constructing a 150-ton steamer in Leith
Leith
-South Leith v. North Leith:Up until the late 16th century Leith , comprised two separate towns on either side of the river....

 to ferry workers and materials out to the reef. The difficulties should not be underestimated. Although Skerryvore is a dozen miles from Hynish it is 50 miles (80 km) from the mainland. The first work to be undertaken on Skerryvore itself was the construction of a six-legged frame on top of which a wooden barrack to house 40 men was placed. The building was created in Gourock
Gourock
Gourock is a town falling within the Inverclyde council area and formerly forming a burgh of the historic county of Renfrewshire in the west central Lowlands of Scotland. It has in the past functioned as a seaside resort on the Firth of Clyde...

 before being dismantled and re-built on site.

Initial work began on the rock on 7 August 1838. Stevenson and 21 workmen arrived on board the sailing vessel Pharos and began to unload the barrack, whose massive legs were set into holes blasted out of the rock. After only two days the site had to be abandoned as a storm swept in from the Atlantic. It was a further six days before they could resume the punishing schedule of 16 hours a day work between 4 am and 8 pm. Fearing sea sickness, many of the man preferred to attempt to sleep on the damp rocks than on the ever-rolling Pharos.

Work for the season lasted only until 11 September, by which time the barrack legs had been secured although not the main structure. Less than two months later Stevenson received a letter from the storekeeper at Hynish, Mr. Hogben. It began: "Dear Sir, I am extremely sorry to inform you that the barrack erected on Skerryvore Rock has totally disappeared." The structure had been destroyed during in a gale on 3 November and four months effort had been wasted. Stevenson hired a boat to take him out to inspect the damage the same day he received this news. Firm in his self-belief, he resolved to build a stronger but otherwise identical replacement. Work began in April 1839 and by early September the completed barrack stood 60 feet (18 m) above the rock. Entry was via ladders attached to the legs that led into the lowest level containing a kitchen. The middle level contained two cabins, one for Stevenson, the other for his master of works, whilst the top level provided sleeping quarters for a further 30 to 40 men.

Work on the foundations for the lighthouse continued until 30 September. A total of 296 charges were used to remove 2,000 tons of rock and Stevenson believed that the rock was so hard that the effort involved was four times that required for boring Aberdeenshire
Aberdeenshire
Aberdeenshire is one of the 32 unitary council areas in Scotland and a lieutenancy area.The present day Aberdeenshire council area does not include the City of Aberdeen, now a separate council area, from which its name derives. Together, the modern council area and the city formed historic...

 granite
Granite
Granite is a common and widely occurring type of intrusive, felsic, igneous rock. Granite usually has a medium- to coarse-grained texture. Occasionally some individual crystals are larger than the groundmass, in which case the texture is known as porphyritic. A granitic rock with a porphyritic...

. The work went well but by the end of the second season, no blocks had yet been laid. However, between April 1839 and June 1840 4,300 blocks had been fashioned, the stone donated by the Duke of Argyll from quarries on Mull. The roughly hewn rock was taken to Hynish where the blocks were hammered and chiselled into shape. The largest weighed over 2.5 tons, the smallest 0.75 tons and the precision required meant that a single block could take 320 man hours to complete.

Tower

The new barrack withstood the violence of the storms during the winter of 1839–40. Work re-commenced on the rock on 30 April 1840, and after the arrival of the new steamer Skerryvore the carefully fashioned blocks began to arrive on site. The first one was laid by John Campbell, 7th Duke of Argyll
John Campbell, 7th Duke of Argyll
-External links:...

 on 4 July. His son George
George Campbell, 8th Duke of Argyll
George John Douglas Campbell, 8th Duke of Argyll KG, KT, PC, FRS, FRSE , styled Marquess of Lorne until 1847, was a Scottish peer, Liberal politician as well as a writer on science, religion, and the politics of the 19th century.-Background:Argyll was born at Ardencaple Castle, Dunbartonshire, the...

 later wrote:
Soon up to 95 blocks a day were arriving from Hynish, although the weather continued to play its part. During the summer of 1840 the steamer was unable to reach the reef for fourteen consecutive days, and on another occasion no landings were possible for seven weeks and supplies began to run low. When work ceased again in the autumn, 800 tons of granite standing 8 feet 2 ins (2.5 m) high stood on Skerryvore, and up to 80 craftsmen continued to labour on the blocks at Hynish all winter. The first three courses of the base are of hard Hynish gneiss
Gneiss
Gneiss is a common and widely distributed type of rock formed by high-grade regional metamorphic processes from pre-existing formations that were originally either igneous or sedimentary rocks.-Etymology:...

, the remainder are granite from the Ross of Mull.

Work continued during 1841–2, a crane being used to hoist the huge blocks as the tower rose. The last one was raised to the parapet in July 1842. Robert Stevenson, then aged 70, visited the site on his last annual voyage of inspection. The walls at the base are 9.5 feet (2.9 m) thick, and 2 foot (0.6096 m) thick at the top. The lightroom and lantern sit above nine apartments 12 feet (3.7 m) in diameter. The total cost of the works undertaken by the Northern Lighthouse Board was £86,977, including the cost of establishing the shore station at Hynish, estimated at £13,000. It is a credit to Stevenson, his foreman Charles Stewart, and Captain Macurich the landing master, that not a single life was lost during the construction.

Fitting out

The final season of work in 1843 was spent in fitting out the interior. By then Alan had become chief engineer to the NLB and the final work was undertaken under the supervision of his brother Thomas
Thomas Stevenson
Thomas Stevenson PRSE MInstCE FRSSA FSAScot was a pioneering Scottish lighthouse designer and meteorologist, who designed over thirty lighthouses in and around Scotland, as well as the Stevenson screen used in meteorology...

. The light, which had eight lenses revolving around a four wick lamp with pyramidal lenses above and reflecting prisms below each one, was constructed by John Milne of Edinburgh. The machinery was ready by the beginning of 1844, but it was seven weeks before a landing could be undertaken on the rock. The lamp was finally lit on 1 February and it shone without interruption for the next 110 years.

Skerryvore was Alan Stevenson's greatest achievements from both an engineering and aesthetic perspective. No philistine
Philistinism
Philistinism is a derogatory term used to a particular attitude or set of values perceived as despising or undervaluing art, beauty, spirituality, or intellectualism. A person with this attitude is referred to as a Philistine and may also be considered materialistic, favoring conventional social...

, he chose a hyberbolic curve
Hyperbolic function
In mathematics, hyperbolic functions are analogs of the ordinary trigonometric, or circular, functions. The basic hyperbolic functions are the hyperbolic sine "sinh" , and the hyperbolic cosine "cosh" , from which are derived the hyperbolic tangent "tanh" and so on.Just as the points form a...

 for the outline for stylistic reasons. His nephew Robert Louis
Robert Louis Stevenson
Robert Louis Balfour Stevenson was a Scottish novelist, poet, essayist and travel writer. His best-known books include Treasure Island, Kidnapped, and Strange Case of Dr Jekyll and Mr Hyde....

 described it as "the noblest of all extant deep-sea lights" and according to the Northern Lighthouse Board it is "asserted by some that Skerryvore is the world's most graceful lighthouse".

Keepers

Such are the hazards of the surrounding reefs that the lighthouse is not normally approached by shipping. However, completion of the construction work did not result in an end to the difficulties for those involved in its operations. The easiest landing is at Riston's Gully, which intersects the rock near the tower. An unaided landing has been described as "like climbing up the side of a bottle". A system of ropes attached to a derrick was installed to assist these dangerous operations. Statistics compiled for the two decades from 1881–1890 showed Skerryvore as having been the stormiest part of Scotland. There were a total of 542 storms lasting 14,211 hours during that period. One keeper lost his hearing for several weeks, after a lightening strike had thrown him through the entrance door.

James Tomison, who became a keeper in 1861, wrote of the bird migrations visible from the tower: "Hundreds of birds are flying about in all directions, crossing and re-crossing one another's flight, but never coming into collision, all seemingly of the opinion that the only way of escape out of the confusion into which they have got is through the windows of the lantern". A fog bell had been installed by then, one of only two operating in Scotland at the time.

The adverse conditions faced by the keepers resulted in them receiving additional payments in kind, but the remote location suited some veterans. Archibald McEachern was assistant keeper for 14 years from 1870–84 and John Nicol was principal from 1890–1903. The latter was involved in a dramatic rescue when the liner Labrador en route from Halifax, Nova Scotia
City of Halifax
Halifax is a city in Canada, which was the capital of the province of Nova Scotia and shire town of Halifax County. It was the largest city in Atlantic Canada until it was amalgamated into Halifax Regional Municipality in 1996...

 to Liverpool
Liverpool
Liverpool is a city and metropolitan borough of Merseyside, England, along the eastern side of the Mersey Estuary. It was founded as a borough in 1207 and was granted city status in 1880...

 ran aground on the nearby Mackenzie's Rock in 1899. The lifeboats were manned and two made it to Mull, but one with eighteen passengers reached the lighthouse where they were looked after for two and a half days before they could be taken to the mainland. No lives were lost and Nicol and his two assistants were commended by the NLB for their efforts.

John Muir, who served as a keeper with the NLB for 39 years all told, had a posting to Skerryvore from 1902 to 1914. He helped complete a new "landing grating", as the slender metal walkway was called, that made landings possible in conditions previously considered "hopeless". He baked his own bread and scones and made an inlaid table and Iona
Iona
Iona is a small island in the Inner Hebrides off the western coast of Scotland. It was a centre of Irish monasticism for four centuries and is today renowned for its tranquility and natural beauty. It is a popular tourist destination and a place for retreats...

 marble
Marble
Marble is a metamorphic rock composed of recrystallized carbonate minerals, most commonly calcite or dolomite.Geologists use the term "marble" to refer to metamorphosed limestone; however stonemasons use the term more broadly to encompass unmetamorphosed limestone.Marble is commonly used for...

 inkstand.

Post-construction events

Numerous dignitaries visited the light in the ensuing years. William Chambers, the Lord Provost
Lord Provost
A Lord Provost is the figurative and ceremonial head of one of the principal cities of Scotland. Four cities, Aberdeen, Dundee, Edinburgh and Glasgow, have the right to appoint a Lord Provost instead of a provost...

 of Edinburgh
Edinburgh
Edinburgh is the capital city of Scotland, the second largest city in Scotland, and the eighth most populous in the United Kingdom. The City of Edinburgh Council governs one of Scotland's 32 local government council areas. The council area includes urban Edinburgh and a rural area...

 came in 1866 and wrote:
The visual similarity between Skerryvore and Dubh Artach 20 miles (32 kilometres) to the south east, led to the NLB painting a distinctive red band round the middle section of the latter in 1890. The Hynish Shore Station had the advantage of proximity to the site during the construction period. However the small harbour offered little shelter for shipping. The keepers operated from here until 1892 when operations were transferred to Erraid
Erraid
The Isle of Erraid is a tidal island approximately one mile square in area located in the Inner Hebrides of Scotland. It lies west of Mull and southeast of Iona. The island receives about of rain and 1,350 hours of sunshine annually, making it one of the driest and sunniest places on the western...

 adjacent to the Isle of Mull
Isle of Mull
The Isle of Mull or simply Mull is the second largest island of the Inner Hebrides, off the west coast of Scotland in the council area of Argyll and Bute....

. Other than the signal tower, the land and buildings on Tiree were sold to the George Campbell, Duke of Argyll who had witnessed the laying of the first stone on Skerryvore fifty two years previously. A paddle steamer, Signal, built by Laird of Greenock
Greenock
Greenock is a town and administrative centre in the Inverclyde council area in United Kingdom, and a former burgh within the historic county of Renfrewshire, located in the west central Lowlands of Scotland...

 in 1883 was based at Erraid for relief operations. The shore station was moved to Oban in the 1950s.
In 1916 mines were laid in the vicinity of the rock by the German submarines SM U-71
SM U-71
SM U-71 was one of 329 submarines serving in the Imperial German Navy in World War I.U-71 was engaged in the naval warfare and took part in the First Battle of the Atlantic.- Operations :...

 and SM U-78
SM U-78
-External links:*** More detailed information about U-78.* original documents, photos and maps about World War I German submarine warfare and British Room 40 Intelligence from The National Archives, Kew, Richmond, UK....

. In July 1940 during World War II
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

 a stick of bombs was dropped by a passing German plane. The explosion cracked two lantern panes and shattered one of the incandescent mantles.

A disastrous fire started on the seventh floor on the night of 16 March 1954 and spread downwards. The keepers had no time to raise the alarm and were driven out of the light onto the rocks but rescued the next day when the relief vessel arrived as part of its regular schedule. The heat of the fire caused damage to both the interior and the structure and a lightship and series of temporary lights were installed during reconstruction. Three new generators were placed in the lighthouse to provide an electric light source, the lantern being re-lit on 6 August 1959.

A helipad
Helipad
Helipad is a common abbreviation for helicopter landing pad, a landing area for helicopters. While helicopters are able to operate on a variety of relatively flat surfaces, a fabricated helipad provides a clearly marked hard surface away from obstacles where a helicopter can safely...

 was constructed in 1972 to enable relief trips to be undertaken without the need for perilous sea landings. The lighthouse has been fully automated since 31 March 1994 and is monitored via a radio link to Ardnamurchan
Ardnamurchan
Ardnamurchan is a peninsula in Lochaber, Highland, Scotland, noted for being very unspoilt and undisturbed. Its remoteness is accentuated by the main access route being a single track road for much of its length.-Geography:...

lighthouse.

The Hynish tower has been converted to house the Skerryvore Lighthouse Museum, run by the Hebridean Trust who have also restored the pier. It is now possible to visit Skerryvore with Tiree-based Skippinish Sea Tours.

Further reading

  • Hogan, C.Michael (2011) Sea of the Hebrides. Eds. P. Saundry & C.J.Cleveland. Encyclopedia of Earth. National Council for Science and the Environment. Washington DC.

External links

The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
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