Cape Hatteras Light

Infobox Lighthouse


caption = Cape Hatteras Lighthouse
location = North of Cape Hatteras Point, Outer Banks, Hatteras Island, North Carolina
coordinates = coor dms|35|15|02|N|75|31|43.7|W|region:US_type:landmark
yearbuilt = 1803 (original tower)
1870 (current tower)
yearlit = 1870 (current tower)
automated = 1936 (skeleton tower)
1950 (current tower)
yeardeactivated =
foundation = Granite, timber and rubble (first location)
Reinforced concrete (current location)
construction = Brick
marking = white and black spiral bands with red brick base.
shape = Conical
height = 198.5 ft (63 m) cite web | url = http://www.nps.gov/history/maritime/park/hatteras.htm | title = Inventory of Historic Lighthouses | accessdate = 2007-08-14 | publisher = National Park Service ]
lens = First order Fresnel, 1870
currentlens = DCB-24 (1972)
range = 20 nm (37 km)
characteristic = Short flash every 7.5 seconds
admiralty = J2396
ARLHS = USA-119
USCG = 2-0625

Cape Hatteras Light is a lighthouse located on Hatteras Island in the Outer Banks of North Carolina near the community of Buxton. The Outer Banks are a group of islands on the North Carolina coast that separate the Atlantic Ocean from the coastal sounds and inlets. Atlantic currents in this area made for excellent travel for ships, except in the area of Diamond Shoals, just offshore at Cape Hatteras. Nearby, the warm Gulf Stream ocean current collides with the colder Labrador Current, creating ideal conditions for powerful ocean storms and sea swells. The large number of ships that ran aground because of these shifting sandbars, including the Civil War ironclad warship USS Monitor, gave this area the nickname “Graveyard of the Atlantic.” It also led Congress to authorize the construction of the Cape Hatteras Lighthouse which is recognized by the National Park Service as the tallest lighthouse in America. The lighthouse is one of several on the North Carolina coast that are still operational including the Currituck, Bodie Island, Ocracoke, Cape Lookout, and Oak Island lighthouses.

Overview

The light at the top is automated and is visible every seven seconds. In good visibility conditions, the beacon can often be seen for convert|20|mi|km out at sea, although its official range is convert|24|mi|km under optimal conditions. Over 1 million bricks were used in the construction of the structure, which was built between 1868 to 1870 at a cost (then) of $167,500.

The Cape Hatteras lighthouse is still considered operational as a navigation aid maintained by the United States Coast Guard and the National Park Service. However, the need for the lighthouse has been reduced by modern day GPS and other electronic navigational devices.

The lighthouse beacon was also augmented by the convert|175|ft|m|sing=on tall Diamond Shoals light tower, which is convert|12|mi|km off of the Hatteras coast. The light tower was put in place in 1967 and lightships were present before then dating back to 1824, including one lightship sunk by a German submarine during World War I. The light tower has recently been decommissioned by the United States Coast Guard, as maintenance on the structure proved too expensive in light of increasing reliance on GPS.

The National Park Service permits climbing to the top of the lighthouse. For a number of years, this was not possible due to repairs to the lighthouse.cite web |url=http://www.wral.com/news/local/story/1089658/ |title=Cape Hatteras Lighthouse Closed After Portion of Stairway Support Breaks |accessdate=2008-10-10 |publisher=WRAL-TV |date=2001-06-13 ] The lighthouse is open for tours from the third Friday in April to Columbus Day. The climb is considered strenuous because the climb is equivalent to 12 stories. There is a handrail on only one side of the stairs, and there is two-way traffic on the stairs.cite web
url = http://www.nps.gov/caha/planyourvisit/climbing-the-cape-hatteras-lighthouse.htm
title = Climbing the Cape Hatteras Lighthouse
accessdate = 2007-04-28
publisher = National Park Service

]

History

Original lighthouse

On July 10, 1797, Congress appropriated $44,000 "for erecting a lighthouse on the head land of Cape Hatteras and a lighted beacon on Shell Castle Island, in the harbor of Ocracoke in the State of North Carolina." The Cape Hatteras Lighthouse cost $14,302 to build and the Shell Castle Island Lighthouse was built from part of the surplus. Both were completed in 1803.

The Cape Hatteras light marked very dangerous shoals which extend from the cape for a distance of convert|10|nmi|km. The original tower was built of dark sandstone and retained its natural color. The original light consisted of 18 lamps; with convert|14|in|mm|sing=on reflectors, and was convert|112|ft|m above sea level. It was visible in clear weather for a distance of convert|18|mi|km.

In July 1851, Lt. David D. Porter, USN, reported as follows:

The improvement in the light referred to had begun in 1845 when the reflectors were changed from 14 to convert|15|in|mm|sing=on. In 1848 the 18 lamps were changed to 15 lamps with convert|21|in|mm|sing=on reflectors and the light had become visible in clear weather at a distance of convert|20|mi|km. In 1854 a first-order Fresnel lens with flashing white light was substituted for the old reflecting apparatus, and the tower was raised to convert|150|ft|m.

In 1860 the Lighthouse Board reported that Cape Hatteras Lighthouse required protection, due to the outbreak of the Civil War. In 1862 the Board reported "Cape Hatteras, lens and lantern destroyed, light reexhibited."Fact|date=August 2008

Second lighthouse

At the behest of mariners and officers of the U.S. Navy, Congress appropriated $80,000 to the United States Lighthouse Board to construct a new beacon at Cape Hatteras in 1868. The Light-House Board was a federal agency under the direction of the Treasury Department but was headed by a multi-agency committee. The Board consisted of two Army Engineers, two Navy officers, two civilian scientists, and one additional officer from both the Army and Navy to serve as secretaries. Congress established the Board in 1852 for the purpose of creating a unified, continuous system of navigational aides along the coasts. Prior to 1852, lighthouse construction generally rested with local authorities, ultimately leading to a disjointed, ineffective national system. Under the Light-House Board, Navy officers determined where new lighthouses were needed; Army Engineers selected exact locations, designed, and built them; and civilian scientists developed new technologies and techniques for displaying bright, consistent beacons. [ [http://www.hq.usace.army.mil/history/Vignettes/111_lighthouses/lighthouse.html Historical Vignette 111 - Cape Hatteras Lighthouse ] ]

Completed in just under two years under the direction of Brevet Brigadier General J. H. Simpson of the U.S. Army Corps of Engineers, the new Cape Hatteras lighthouse cost $167,000. The new tower, from which the first-order light was first exhibited December 16, 1871, was the highest brick lighthouse tower in the world. It was convert|193|ft|m above ground and the focal height of the light was convert|191|ft|m above water. The old tower "being no longer of any use and in danger of falling during some heavy storm" was demolished in February 1872.

In the spring of 1879 the tower was struck by lightning. Cracks subsequently appeared in the masonry walls, which was remedied by placing a metal rod to connect the iron work of the tower with an iron disk sunk in the ground. In 1912 the candlepower of the light was increased from 27,000 to 80,000.

Ever since the completion of the new tower in 1870, there had begun a very gradual encroachment of the sea upon the beach. This did not become serious, however, until 1919, when the high water line had advanced to about convert|300|ft|m from the base of the tower. Since that time the surf had gnawed steadily toward the base of the tower until 1935, when the site was finally reached by the surf. Several attempts were made to arrest this erosion, but dikes and breakwaters had been of no avail. In 1935, therefore, the tower light was replaced by a light on a skeleton steel tower placed farther back from the sea on a sand dune, convert|166|ft|m above the sea, and visible for convert|19|mi|km. The old tower was then abandoned to the custody of the National Park Service.

The Civilian Conservation Corps and Works Progress Administration erected a series of wooden revetments which checked the wash that was carrying away the beach. In 1942 the Coast Guard resumed its control over the tower, and manned it as a lookout station until 1945. The old tower was now 500 to convert|900|ft|m inland from the sea and again tenable as a site for the light, which was placed in commission January 23, 1950.

The new light consists of a convert|36|in|m|sing=on aviation-type rotating beacon of 250,000 candlepower, visible convert|20|mi|km, and flashing white every 7.5 seconds. The skeleton steel tower was retained to guard against the time that the brick tower may again be endangered by erosion and thus require that the light again be moved.

The National Park Service acquired ownership of the lighthouse when it was abandoned in 1935. In 1950, when the structure was again found safe for use, new lighting equipment was installed. Now the Coast Guard owns and operates the navigational equipment, while the National Park Service maintains the tower as a historic structure. The Hatteras Island Visitor Center, formerly the Double Keepers Quarters located next to the lighthouse, elaborates on the Cape Hatteras story and man's lifestyle on the Outer Banks. Cape Hatteras Lighthouse, tallest in the United States, stands convert|208|ft|m from the bottom of the foundation to the peak of the roof. To reach the light, which shines convert|191|ft|m above mean high water mark, a Coast Guardsman must climb 268 steps. The construction order of 1,250,000 bricks was used in construction of the lighthouse and principal keeper's quarters.cite web
url = http://www.uscg.mil/hq/g-cp/history/WEBLIGHTHOUSES/LHNC.html
title = North Carolina Light Stations
accessdate = 2007-04-28
publisher = United States Coast Guard

]

Relocation

Due to erosion of the shore, the Cape Hatteras lighthouse was moved (by Expert House Movers) from its original location at the edge of the ocean to safer ground convert|2870|ft|m inland. The move was controversial at the time with speculation that the structure would not survive the move, resulting in lawsuits that were later dismissed. Despite some opposition, work progressed and the move was completed between 1999 and 2000 in a massive operation. Rededicated in 2000, the lighthouse is fully open to the public at its new location further inland. [Mike Booher and Lin Ezell, "Out of Harm's Way", Eastwind Publishing, Annapolis, MD, 2001, ISBN 1-885457-15-4.]

Specifications

* Construction material: Approximately 1,250,000 bricks
* Height above sea level: convert|210|ft|m
* Height of the structure: about 207½ feet (63.2 m) (from the bottom of the foundation footer to the top of the spire on the roof)
* Daymark: black and white spiral stripes
* Number of steps: 268 steps to reach the light
* Brightness: 800 kilocandelas from each of two 1000-watt lamps
* Flash pattern: Every 7.5 seconds a short flash is visible
* Visibility: From 20 nautical miles (37 km) in clear conditions. In exceptional conditions, it has been seen from 51 miles (94 km) out.

References

External links

* [http://www.nps.gov/caha/lh.htm National Park Service Hatteras Lighthouse Page]
* [http://www.itpi.dpi.state.nc.us/caroclips/homepage.html NC Public Instruction Lighthouse Page]
* [http://www.outerbanks.net/webcams/cam/Top-of-Cape-Hatteras-Lighthouse.html Webcam from lighthouse peak]
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