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Hyperradiant Fresnel Lens
Hyper-radial or hyperradiant Fresnel lenses are Fresnel lenses used in lighthouses. They are larger than "first-order" lenses, having a focal length (radius) of 1330 mm (52.36 inches). The idea was mentioned by Thomas Stevenson in 1869 and first proposed by John Richardson Wigham in 1872, and again proposed by Thomas Stevenson in 1885 (infringing Wigham's patent). The hyper-radial lens was made in 1885 by the F. Barbier Company in Paris as a test lens for the lighthouse illumination trials then going on at the South Foreland Lighthouse in the United Kingdom (UK). Chance Brothers Glass Company made their first hyper-radial lens in 1887 in the UK. These lenses were originally named biform, and later triform and quadriform lenses, by Wigham. Thomas Stevenson used the term hyperradiant lens, and later they were renamed the hyper-radial lens by James Kenward of the Chance Brothers Glass Company. The hyper-radial Fresnel lenses were the largest ever put into use and were inst ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pakistan
Pakistan ( ur, ), officially the Islamic Republic of Pakistan ( ur, , label=none), is a country in South Asia. It is the world's fifth-most populous country, with a population of almost 243 million people, and has the world's second-largest Muslim population just behind Indonesia. Pakistan is the 33rd-largest country in the world by area and 2nd largest in South Asia, spanning . It has a coastline along the Arabian Sea and Gulf of Oman in the south, and is bordered by India to the east, Afghanistan to the west, Iran to the southwest, and China to the northeast. It is separated narrowly from Tajikistan by Afghanistan's Wakhan Corridor in the north, and also shares a maritime border with Oman. Islamabad is the nation's capital, while Karachi is its largest city and financial centre. Pakistan is the site of several ancient cultures, including the 8,500-year-old Neolithic site of Mehrgarh in Balochistan, the Indus Valley civilisation of the Bronze Age, the most extens ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bell Rock Lighthouse
The Bell Rock Lighthouse, off the coast of Angus, Scotland, is the world's oldest surviving sea-washed lighthouse. It was built between 1807 and 1810 by Robert Stevenson on the Bell Rock (also known as Inchcape) in the North Sea, east of the Firth of Tay. Standing tall, its light is visible from inland. The masonry work on which the lighthouse rests was constructed to such a high standard that it has not been replaced or adapted in 200 years. The lamps and reflectors were replaced in 1843; the original ones are now in the lighthouse at Cape Bonavista, Newfoundland, where they are currently on display. The working of the lighthouse has been automated since 1988. The lighthouse previously operated in tandem with a shore station, the Bell Rock Signal Tower, built in 1813 at the mouth of Arbroath harbour. Today this building houses the Signal Tower Museum, a visitor centre that offers a detailed history of the lighthouse. Because of the engineering challenges that were overco ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yushan Island
Yushan Island () is in Xiangshan County in northeast Zhejiang province, Eastern China. It is the most southeastern island in Xiangshan, located 27 miles from Shipu Town (), near Ningbo City. It is situated in the north and south ocean current intersection belt, and is the line basis points of China’s territorial waters. The island's north section is the largest, with a total land area of 2.3 square kilometers. There are three sub-islands called North Yushan (), South Yushan (), and the Five Tiger Reef (). Yushan Island is known as "the first fishing area in Asia". The island contains unique reefs with crystal-clear seawater, in addition to being rich with fish, shellfish and algae resources — in total more than 300 types. Nature In 2008, Yushan Island was registered as a national marine sanctuary to contain rich local marine ecosystem, and was also designated as agricultural grounds to promote natural resources including by artificial reefs An artificial reef is a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bazaruto Island
Bazaruto ( pt, Ilha do Bazaruto, from Ushurutswa, island of the mist) is a sandy island located approximately southeast of the mouth of the Save River, Mozambique (). It is the largest island in the Bazaruto Archipelago and in the Bazaruto National Park. The warm, southward-flowing Mozambique Current seems to contribute to the increasing buildup of the sandy coastline. Because the water along this coastal area is very clear, much of the sub-surface channel pattern around the island is discernible. Several narrow lines of plankton bloom parallel the shoreline on the satellite photo below. Bazaruto Archipelago holds the largest population of dugong in Mozambique (around 300 animals), almost certainly is the last remaining viable population of dugongs left off East Africa. The coastal plains show numerous lakes and a swampy environment that appears to be karst topography. Underlying the area is limestone rock that has eroded into a pockmarked landscape, creating water-filled sink ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bazaruto Lighthouse , Mozambique
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Bazaruto may refer to: *Bazaruto Archipelago, Mozambique *Bazaruto Island, Mozambique *Bazaruto National Park The Bazaruto Archipelago National Park (BANP) is a protected area in the Inhambane Province of Mozambique on the Bazaruto Archipelago. The park was proclaimed on 25 May 1971. It is off the coast of the Vilanculos and Inhassoro districts, covering ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The London Gazette
''The London Gazette'' is one of the official journals of record or government gazettes of the Government of the United Kingdom, and the most important among such official journals in the United Kingdom, in which certain statutory notices are required to be published. ''The Gazette'' is not a conventional newspaper offering general news coverage. It does not have a large circulation. Other official newspapers of the UK government are ''The Edinburgh Gazette'' and '' The Belfast Gazette'', which, apart from reproducing certain materials of nationwide interest published in ''The London Gazette'', also contain publications specific to Scotland and Northern Ireland, respectively. In turn, ''The London Gazette'' carries not only notices of UK-wide interest, but also those relating specifically to entities or people in England and Wales. However, certain notices that are only of specific interest to Scotland or Northern Ireland are also required to be published in ''The London Gazett ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barberyn Lighthouse
Barberyn Lighthouse (also known as Beruwala Lighthouse) is a lighthouse located on Barberyn Island. Barberyn Island a island situated offshore from the town of Beruwala on the south-west coast of Sri Lanka, south of Colombo.The lighthouse is a high round white conical granite tower. The lighthouse was completed in November 1889, and operated by the Imperial Lighthouse Service. In 1969 it was upgraded with the replacement of the old dioptric apparatus (produced by Chance Brothers) and with a pedestal rotating beacon (Pharos Marine PRB-21 sealed beam optic and drive pedestal). It was further modernised in 2000, with the introduction of a Differential Global Positioning System (DGPS) and is computer linked to the other major lighthouses around the country. The Barberyn Lighthouse is one of the four international lighthouses in Sri Lanka. See also * List of lighthouses in Sri Lanka This is a list of lighthouses in Sri Lanka. There are 14 active lighthouses in Sri Lanka. Mos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Newfoundland (island)
Newfoundland (, ; french: link=no, Terre-Neuve, ; ) is a large island off the east coast of the North American mainland and the most populous part of the Canadian province of Newfoundland and Labrador. It has 29 percent of the province's land area. The island is separated from the Labrador Peninsula by the Strait of Belle Isle and from Cape Breton Island by the Cabot Strait. It blocks the mouth of the Saint Lawrence River, creating the Gulf of Saint Lawrence, the world's largest estuary. Newfoundland's nearest neighbour is the French overseas collectivity of Saint Pierre and Miquelon. With an area of , Newfoundland is the world's 16th-largest island, Canada's fourth-largest island, and the largest Canadian island outside the North. The provincial capital, St. John's, is located on the southeastern coast of the island; Cape Spear, just south of the capital, is the easternmost point of North America, excluding Greenland. It is common to consider all directly neighb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cape Race
Cape Race is a point of land located at the southeastern tip of the Avalon Peninsula on the island of Newfoundland, in Newfoundland and Labrador, Canada. Its name is thought to come from the original Portuguese name for this cape, "Raso", meaning flat or low-lying. The Cape appeared on early sixteenth century maps as Cabo Raso and its name may derive from a cape of the same name at the mouth of the Tagus River in Portugal. The cape was the location of the Cape Race LORAN-C transmitter until the system was decommissioned in 2010. It is also home to the Cape Race Lighthouse, notable for having received the distress call from the RMS ''Titanic''. Geography Dense fog, rocky coasts, and its proximity to trans-Atlantic shipping routes have resulted in many shipwrecks near Cape Race over the years. One of the most famous was the . Cape Race is a flat, barren point of land jutting out into the Atlantic Ocean, its cliffs rising almost vertically to above sea level. On average it i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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