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Conservation And Restoration Of Lighthouses
The conservation and restoration of lighthouses is when lighthouse structures are preserved through detailed examination, cleaning, and in-kind replacement of materials. Given the wide variety of materials used to construct lighthouses, a variety of techniques and considerations are required. Lighthouses alert seagoers of rocky shores nearby and provide landmark navigation. They also act as a physical representation to maritime history and advancement. These historic buildings are prone to deterioration due to their location on rocky outcrops of land near the water, as well as severe weather events, and the continued rise of sea levels. Given these conditions preservation and conservation efforts have increased. Exterior Ground The ground consists of the land, outbuildings, and landscape that the lighthouse property sits on. The grounds may also include buildings from other time periods. The types of buildings, their relationship to one another, their location over the whol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lighthouses
A lighthouse is a tower, building, or other type of physical structure designed to emit light from a system of lamps and lenses and to serve as a beacon for navigational aid for maritime pilots at sea or on inland waterways. Lighthouses mark dangerous coastlines, hazardous shoals, reefs, rocks, and safe entries to harbors; they also assist in aerial navigation. Once widely used, the number of operational lighthouses has declined due to the expense of maintenance and the advent of much cheaper, more sophisticated, and more effective electronic navigational systems. History Ancient lighthouses Before the development of clearly defined ports, mariners were guided by fires built on hilltops. Since elevating the fire would improve visibility, placing the fire on a platform became a practice that led to the development of the lighthouse. In antiquity, the lighthouse functioned more as an entrance marker to ports than as a warning signal for reefs and promontories, unlike many mod ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fresnel Lens
A Fresnel lens ( ; ; or ) is a type of composite compact lens (optics), lens which reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections. The simpler Dioptrics, dioptric (purely refraction, refractive) form of the lens was first proposed by Georges-Louis Leclerc, Comte de Buffon, and independently reinvented by the French physicist Augustin-Jean Fresnel (1788–1827) for use in lighthouses. The Catadioptric system, catadioptric (combining refraction and reflection) form of the lens, entirely invented by Fresnel, has outer Prism (optics), prismatic elements that use total internal reflection as well as refraction to capture more oblique light from the light source and add it to the beam, making it visible at greater distances. The design allows the construction of lenses of large aperture and short focal length without the mass and volume of material that would be required by a lens of conventional ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Coast Guard
The United States Coast Guard (USCG) is the maritime security, search and rescue, and Admiralty law, law enforcement military branch, service branch of the armed forces of the United States. It is one of the country's eight Uniformed services of the United States, uniformed services. The service is a maritime, military, multi-mission service unique among the United States military branches for having a maritime law enforcement mission with jurisdiction in both domestic and international waters and a Federal government of the United States, federal regulatory agency mission as part of its duties. It is the largest coast guard in the world, rivaling the capabilities and size of most Navy, navies. The U.S. Coast Guard protects the United States' borders and economic and security interests abroad; and defends its sovereignty by safeguarding sea lines of communication and commerce across U.S. territorial waters and its Exclusive economic zone, Exclusive Economic Zone. Due to ever-ex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cape Hatteras Lighthouse
Cape Hatteras Light is a lighthouse located on Hatteras Island in the Outer Banks in the town of Buxton, North Carolina and is part of the Cape Hatteras National Seashore. It is the tallest lighthouse in the U.S. from base to tip at 210 feet. The lighthouse's semi-unique pattern makes it easy to recognize and famous. It is often ranked high on lists of most beautiful, and famous lighthouses in the US. The Outer Banks are a group of barrier islands on the North Carolina coast that separate the Atlantic Ocean from the coastal sounds and inlets. Atlantic ocean current, 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 gave this area the nickname "Graveyard of the Atlantic." ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gay Head Light
Gay Head Light is a historic lighthouse located on Martha's Vineyard westernmost point off of Lighthouse Road in Aquinnah, Massachusetts. History 1796–1838 – Gay Head Light – the first lighthouse on Martha's Vineyard When the first Congress of the newly formed United States government met in 1789, one of its first acts was to assume responsibility for lighthouses and other aids to navigation along the country's coastline. For the next twenty-five years, design and construction of new lighthouses were authorized by Congress. The location, size, design, and construction of each lighthouse was considered of such vital importance, that the decision-making process involved the highest officials, including the President. In 1796, Massachusetts State Senator, Peleg Coffin, requested a lighthouse be installed on Martha's Vineyard above the Gay Head cliffs overlooking a dangerous section of underwater rocks known as "Devil's Bridge." Senator Peleg's request to his Congressman in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sankaty Head Light
The Sankaty Head Light is a lighthouse located on Nantucket, Massachusetts, Nantucket island. It was built in 1850, was automated in 1965, and is still in operation. It is located at the easternmost point of the island, in the village of Siasconset, Massachusetts, Siasconset. It was one of the first lighthouses in the United States to receive a Fresnel lens. History The shoals off the eastern coast of Nantucket had a long history as a hazard to navigation. The United States government decided in the 1840s that a prominent lighthouse should be erected to alert mariners to that hazard. Congress appropriated $12,000 for its construction in 1848, with additional funds totaling $8,000 in following years. The light went into service in February 1850. The tower is high; its lower portion is constructed of brick, and its upper part is granite. The light's turning mechanism was powered by a weight-driven brass clockwork, A brick house was built next to the tower at the time of it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
