The Bosphorus ' limits are defined as the connecting line between the lighthouses Rumeli Feneri and Anadolu Feneri in the north and between the Ahırkapı Feneri and the Kadıköy İnciburnu Feneri in the south.

The two automated lighthouses are protected as listed buildings.

The islands are all exposed to wind and tide and various lighthouses, such as those on Ailsa Craig, Pladda and Davaar act as an aid to navigation.

Along the famous rock-bound coast of Maine are lighthouses, beaches, fishing villages, and thousands of offshore islands, including the Isles of Shoals, which straddle the New Hampshire border.

Noteworthy are the Russian very strong beta emitting strontium-90 sources used as radioisotope thermoelectric generators for beacons in lighthouses in remote areas.

Yemen also has some lighthouses that are maintained for sea navigation by the Yemen Ports Authority, an extension of the “ Port of Aden .” A list of the lighthouses, photographs and descriptions of their flashing can be seen at:.

Fresnel lenses are usually made of glass or plastic ; their size varies from large ( old historical lighthouses, meter size ) to medium ( book-reading aids, OHP viewgraph projectors ) to small ( TLR / SLR camera screens, micro-optics ).

There are automated lighthouses on Middle Island and Thunder Bay Island.

There are two lighthouses in the town, the Cape Pogue Light on Chappaquiddick and the Harbor Light in Edgartown Harbor.

( It and another are the only surviving lighthouses of twelve that once dotted the Mississippi Gulf Coast.

On the cape there are two lighthouses, a navigation tower, two military bunker complexes, the Slavic temple fortress of Jaromarsburg and several tourist buildings ( restaurants, pubs and souvenir shops ).

There are 2 bunkers in the immediate neighbourhood of the 2 lighthouses.

Today's lighthouses on the United States coast are all run by the U. S. Coast Guard.

There are three lighthouses at the heads.

Distress flares are used by mariners in emergencies, while lighthouses and navigation lights are used to communicate navigation hazards.

Screw-pile lighthouses on the reefs in Florida are tall skeletal towers, with living and working quarters set high above the reach of storm waves.

Trees are rather scarce, as many were cut down in the 17th century to fuel the lighthouses on Alderney and the Casquets.

There are two lighthouses operated by Trinity House on the Farne Islands:

All the operational lighthouses on the Farnes are now automatic and have no resident keepers, although in former years they did.

Ruins of older lighthouses may be seen, for example on the Brownsman where there are two.

Lille Torungen and Store Torungen were constructed as twin lighthouses, and both are located in the Arendal shipping lane.

Several lighthouses are also located out in the Vestfjorden: Bjørnøy Lighthouse, Grytøy Lighthouse, Landegode Lighthouse, Nyholmen Lighthouse, and Tennholmen Lighthouse.

Since the 1980s, Swedish surface warships have been named after Swedish cities, while submarines are named after Swedish provinces and minehunters after Swedish lighthouses.

When the Douglass Lighthouse was completed the people of Plymouth, grateful for the countless lives which had been saved since the introduction of the lighthouses, paid for the dismantling and reassembly of the Smeaton Lighthouse from the red rocks of Eddystone to Plymouth Hoe where it is a popular tourist attraction today.

There were two lighthouses located on Baccalieu Island of which today both are automated.

Joseph Nelson is associated with the design of at least fifteen lighthouses, mostly in the Bristol Channel.

All lighthouses have been automated since November 1998, when the UK's last manned lighthouse, North Foreland in Kent, was converted to automatic operation.

The type has become largely obsolete ; some stations were replaced by lighthouses as the construction techniques for the latter advanced, while others were replaced by large automated buoys.

Two fully automated lighthouses operate on the island to aid passing maritime traffic: Bathurst Lighthouse and Wadjemup Lighthouse.

Like all British lighthouses it is now unmanned and fully automated.

The island has " a lighthouse per mile " with the Northern and Western lighthouses on the island, as well as the Peter Island lighthouse in Grand Passage ; all are automated and are operated by the Canadian Coast Guard.

This lighthouse is approximately tall and was one of the first lighthouses to be automated in 1921.

The lighthouse is now automated as are most lighthouses in Finland.

The white tower was manned until March 1997, becaming one of the last lighthouses in Scotland to be automated.

It remained manned into the late 20th century at which point it was automated by the United States Coast Guard, something that happened to most lighthouses in the United States over the course of the 20th century as technology made it less essential for lighthouses to be maintained by human keepers.

Visual beacons range from small, single-pile structures to large lighthouses or light stations and can be located on land or on water.

His scientific work was chiefly concerned with galvanism, anatomy and its medical applications, with the construction and illumination of lighthouses, and with experiments for preserving human life and material objects from destruction by fire.

It replaced three local lighthouses that were under serious threat from coastal erosion.

By day it is easily distinguishable from other coastal lighthouses by its white color and black lantern.

* It is the General Lighthouse Authority for England, Wales, the Channel Islands and Gibraltar, responsible for a range of general aids to navigation, ' signs of the sea ', from lighthouses to radar beacons.

Trinity House maintains 69 lighthouses ranging from isolated rock towers like the Eddystone to mainland towers like Southwold lighthouse.

Automation in the modern context began in the early 1980s, made possible firstly by the construction of lantern top helipads at remote rock lighthouses, to enable the rapid transfer of technicians to a lighthouse in the event of a breakdown, and secondly, by the development of remote control technology, which enables all lighthouses and lightvessels to be monitored and controlled from the Trinity House Operations and Planning Centre, in Harwich, Essex.

The village includes a commercial dock on the west bank of the River Nene over which spans a swing bridge, and the parish, two 19th century lighthouses to the north from the village on the Nene.

Most screwpile lighthouses were made with iron piles, though a few were made with wooden piles covered with metal screw sleeves ( these sleeves were probably adopted because they were less expensive and easier to insert into the bottom, plus the sleeve protected the wood from marine-boring invertebrates ).

The screw-pile was used for the erection of lighthouses and other structures on mudbanks and shifting sands, and employed with great success all over the world from Portland breakwater to Bombay bridges.

The arms show the light beams from the Ona lighthouse, since lighthouses play an important role in the safety in the municipality, which consists of 871 islands and skerries.

The Office of Public Works took the remains of the monastery into guardianship in 1880, and repaired certain collapsed structures, before purchasing the island ( with the exception of the lighthouses and associated structures ) from the Commissioners of Irish Lights.

The first lighthouse at the cape was built in 1803 ; it was replaced by the current Cape Hatteras Lighthouse in 1870, which at from the ground to the tip of its lightning rod is the tallest lighthouse in the United States and one of the tallest brick lighthouses in the world.

Penzance, with its dry dock and engineering facilities, was chosen as the western depot for Trinity House that serviced all the lighthouses and lightships from Start Point to Trevose Head.

Two outlying rock lighthouses are also visible from the south west of Mull, Dubh Artach and Skerryvore.

Photograph looking north from Islandmagee illustrating the proximity to Scotland. In the foreground is Islandmagee in Northern Ireland, followed by Stena Line ferries entering and leaving Larne, and The Maidens lighthouses. In the background are the Scottish Paps of Jura on the left and Mull of Kintyre on the right.

His condition deteriorated, and while there were no lighthouses at the time, it is said that the crew headed towards a light that was coming from Kashiwajima.

Though only wide at the narrowest point ( between the Point Wilson and Admiralty Head lighthouses ), it is through this passage that nearly all the seawater flows into and from Puget Sound during daily tidal variations.

The Oslofjord () is an inlet in the south-east of Norway, stretching from an imaginary line between the Torbjørnskjær and Færder lighthouses and down to Langesund in the south to Oslo in the north.

The museum will feature interactive exhibits and displays on the history, technology, and architecture of lighthouses, lightships and other aids to navigation, from primitive fire beacons to the Global Positioning System.

The Bill is an important way-point for coastal traffic, and so three lighthouses have been built to protect shipping, in particular from its strong tidal race and shallow reef.

In 2000 Carney acted on concerns that landmark lighthouses on both Canadian coast were being neglected by teaming up with the late Senator Mike Forrestall from Nova Scotia to introduce the Heritage Lighthouse Protection Act, a private members bill which has enjoyed consistent multi-party support in subsequent minority Parliaments.