Lightship
Ship that functions as a lighthouse From Wikipedia, the free encyclopedia
Ship that functions as a lighthouse From Wikipedia, the free encyclopedia
A lightvessel, or lightship, is a ship that acts as a lighthouse. They are used in waters that are too deep or otherwise unsuitable for lighthouse construction.[1] Although some records exist of fire beacons being placed on ships in Roman times, the first modern lightship was located off the Nore sandbank at the mouth of the River Thames in London, England, by its inventor Robert Hamblin in 1734. Lightships have since been rendered obsolete by advancing lighthouse construction techniques, and by large automated navigation buoys.[1]
The most important element of lightship design is a tall mast upon which to mount the light. Initially, these lights consisted of oil lamps that were run up the mast and could be lowered for servicing, while later vessels carried fixed lamps which were serviced in place. As they became available, Fresnel lenses were used, and many vessels housed them in smaller versions of lighthouse lanterns. Some lightships had two masts, with the second housing a reserve beacon, in case of the main light's failure.
Initially, lightship hulls were constructed of wood, shaped like the small merchant ships of the time, but this proved unsatisfactory for a permanently anchored ship, so the shape of the hull evolved to reduce rolling and pounding. As iron and steel hulls were popularized, they became used in lightvessels, and the advent of steam and diesel power led to self-propelled and electrically lit designs. Earlier vessels had no propulsion systems and had to be towed to and from their positions.
Much of the ship was taken up by storage for lamp oil and other supplies, as well as crew accommodations. The crew's primary duty was to maintain the light; other tasks included keeping records of passing ships, observing the weather, and occasionally performing rescues.
In the early 20th century, some lightships were fitted with warning bells mounted on their structure or lowered into the water, to warn of danger in poor visibility and to permit a crude estimation of the lightship's location relative to the approaching vessel. Tests conducted by Trinity House found that sound from a bell submerged some 18 feet (5.5 m) could be heard at a distance of 15 miles (24 km), with a practical range in operational conditions of one to three miles (1.6 to 4.8 km).[2][3]
Holding the vessel in position was an important aspect of lightvessel engineering. Early lightships used fluke anchors, which are still in use on many contemporary vessels, though these anchors are prone to dragging, making their performance unsatisfactory in rough seas.
Since the early 19th century, lightships have used mushroom anchors, named for their shape, which typically weigh 3 to 4 tons. The first lightvessel equipped with one was a converted fishing boat, renamed Pharos, meaning lighthouse, which entered service on September 15th, 1807, near Inchcape, Scotland with an anchor weighing 1.5 tons.[4] The introduction of cast iron anchor chains in the 1820s improved their effectiveness dramatically, with the rule of thumb being 6 feet (1.8 m) of chain for every foot of water.
As well as the light, which operated both at night and in fog from one hour before sunset to one hour after sunrise, early lightvessels were equipped with day markers at the tops of masts, which were the first objects seen from an approaching ship. These markers were primarily red and occasionally white, and their designs varied. Filled circles or globes, as well as pairs of inverted cones were the most common designs among them.
For visibility purposes, most later lightships had bright red hulls that displayed the name of the station in white, upper-case letters; relief light vessels displayed the word RELIEF instead. Some vessels had hulls coloured for specific purposes. For example, the Huron Lightship was painted black since she was assigned the black buoy side of the entrance to the Lake Huron Cut. From 1854 until 1860, the lightvessel that operated at Minots Ledge, Massachusetts, had a light yellow hull, to increase contrast between the blue-green seas and the hills behind it.
David Avery and Robert Hamblin in 1731 placed the earliest British lightship at The Nore near the mouth of the River Thames. This was a private venture that operated profitably and without the need for government enforcement of payment for lighting services.[5]
Further vessels were placed off Norfolk in 1736, at Owers Bank in Sussex in 1788, and at the Goodwin Sands in 1793.[6]
Over time, Trinity House, the public authority charged with establishing and maintaining lighthouses in England and Wales, crowded out[colloquialism] the private light vessels. Trinity House is now responsible for all the remaining lightvessels England and Wales, of which there are currently eight unmanned lightvessels and two smaller light floats.[7]
In the 1930s, "crewless lightships" were proposed as a way to operate a light vessel for six to twelve months without a crew.[8]
The first lightvessel conversion to solar power was made in 1995, and all vessels except the '20 class' have now been converted. The '20 class' is a slightly larger type of vessel that derives its power from diesel electric generators. Where a main light with a visible range in excess of 20 nautical miles (37 km) is required, a '20 class' vessel is used, as the main light from a Trinity House solar lightvessel has a maximum range of 19 nautical miles (35 km).
Hull numbers: 19, 22, 23 and 25 (the 20 class); 2, 5, 6, 7, 9, 10, 17 (solar lightvessels); and LF2 and LF3 (solar lightfloats).
The first United States lightship was established at Chesapeake Bay in 1820, and the total number around the coast peaked in 1909 with 56 locations marked. Of those ships, 168 were constructed by the United States Lighthouse Service and six by the United States Coast Guard, which absorbed it in 1939. From 1820 until 1983, there were 179 lightships built for the U.S. government, and they were assigned to 116 separate light stations on four coasts (including the Great Lakes).[9]
The first United States lightships were small wooden vessels with no propelling power. The first United States iron-hulled lightship was stationed at Merrill's Shell Bank, Louisiana, in 1847. Wood was still the preferred building material at the time because of lower cost and ability to withstand shock loading. Wooden lightships often survived more than 50 years in northern waters where the danger of rotting was reduced. Lightvessel 16 guarded Sandy Hook and Ambrose stations for more than 80 years; she had both an inner hull and an outer hull with the space between filled with salt to harden the wood and reduce decay. Several lightships built with composite wood and steel hulls in 1897 proved less durable than either wood or steel. The first modern steel lightship in United States service was lightvessel 44 built in 1882. One of the last United States wooden hulled lightships built, lightvessel 74, went into service at Portland, Maine, in 1902. The first United States lightships with steam engine propulsion were built in 1891 for service on the Great Lakes where seasonal ice required prompt evacuation of light stations to avoid destruction of the lightships.[10]
The official use of lightships in the United States ended on March 29, 1985, when the United States Coast Guard decommissioned its last such ship, the Nantucket I. Many lightships were replaced with Texas Towers or large navigational buoys – both of which are cheaper to operate than lightvessels. In fact, lighthouses often replaced lightships.[11]
Up to and through the Civil War lightships were identified by name, usually that of the station where they served, but as they were moved from station to station, the keeping of records became confusing. In 1867 all existing lightships were given numbers by which they would be permanently identified, and the station at which they were presently serving was painted on their sides, to be changed as needed. Lightships held in reserve to serve in place of those in dock for maintenance were labeled "RELIEF".[12] Surviving lightships are commonly taken to be named according to these labels, but for instance the "Lightship Chesapeake" actually served at two other stations as well as being used for examinations, and last served at the Delaware Light Station. In another case, the LV-114 was labeled "NEW BEDFORD", though there has never been such a station.[13] In an attempt to sort out the early lightships, they were assigned one or two letter designations sometime around 1930; these identifications do not appear in early records, and they are to some degree uncertain.[12]
There are three different and overlapping series of hull numbers. The Lighthouse Service assigned numbers beginning with "LV-" and starting from 1; however, not all numbers were used. When the Coast Guard took over the lighthouse service, all existing lightships were renumbered with "WAL-" prefixes, beginning with "WAL-501". In 1965 they were renumbered again, this time with "WLV-"; however in this case the numbers given were not sequential. Given that only six vessels were constructed after the Coast Guard takeover, the "LV-" series numbers are most commonly used.
It is estimated that there are 15 United States lightships left today. Among them:
There are currently three identical unmanned German lightvessels in service, named FS1, FS3 and FS4. The initialism FS is short for Feuerschiff, which means lightvessel in German. Two of them are normally located at:
Both positions have the same characteristics:
All three ships are operated by the Waterways and Shipping Office Wilhelmshaven and can be seen in the harbour of Wilhelmshaven during maintenance.
In Russia, lightships have been documented since the mid 19th century. The lightvessel service was subordinated to the Russian Hydrographic Office and most of the lightships under it were in the Baltic Sea. In the early 1900s there were about ten lightships in the Russian sector of the Baltics. Among these the following may be mentioned:
Yelaginsky, located on the Yelagin Channel – later moved to the Petrovsky Channel and renamed, Nevsky in the middle of the main channel to St. Petersburg, and Londonsky on Londonsky Shoal off Kotlin Island on the approach to Kronstadt.[30] Other Baltic lightships were located further to the West, with Werkommatala by Primorsk (Koivisto) harbour, Lyserortsky at the entrance of the Gulf of Finland, and Nekmangrund over the treacherous shoals off Hiiumaa Island's NW shore, known as Hiiu Madal in Estonian.[31]
Another well-known lightship was Irbensky of the Soviet Union era. It was the next-to-last Russian lightship. Having been located in the Baltic in the 1980s,[32] it was briefly renamed Ventspilssky while serving near Ventspils port in the Latvian Socialist Soviet Republic.
The last Russian lightvessel in service was Astrakhansky-priyomniy, of the same class as Irbensky. Until 1997 she was marking the deepwater channel leading to Astrakhan harbour while it was doing service in the Caspian Sea.[33]
![Thumb](#/media/File:Lightship_CLS4_"Carpentaria"_(7854156048).jpg)
Because lightvessels must remain anchored in specific positions for the majority of their time at sea, they are more at risk of damage or destruction. Many lightships have been lost in hurricanes.[35]
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