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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 Fresnel lens#Sizes of lighthouse lenses, "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 Barbier, Benard, et Turenne, 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pakistan
Pakistan, officially the Islamic Republic of Pakistan, is a country in South Asia. It is the List of countries and dependencies by population, fifth-most populous country, with a population of over 241.5 million, having the Islam by country#Countries, second-largest Muslim population as of 2023. Islamabad is the nation's capital, while Karachi is List of cities in Pakistan by population, its largest city and financial centre. Pakistan is the List of countries and dependencies by area, 33rd-largest country by area. Bounded by the Arabian Sea on the south, the Gulf of Oman on the southwest, and the Sir Creek on the southeast, it shares land borders with India to the east; Afghanistan to the west; Iran to the southwest; and China to the northeast. It shares a maritime border with Oman in the Gulf of Oman, and is separated from Tajikistan in the northwest by Afghanistan's narrow Wakhan Corridor. Pakistan is the site of History of Pakistan, several ancient cultures, including the ... [...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 (civil engineer), 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 Cape Bonavista Light, lighthouse at Cape Bonavista, Newfoundland, where they are currently on display. The working of the lighthouse has been automated since 24 October 1988. The Northern Lighthouse Board, which has had its headquarters at 84 George Street in Edinburgh since 1832, remotely monitors the light. The lighthouse previously operated in tandem with a shore station, the Bell Rock Signal Tower, built in 1813 at th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yushan Island
Yushan Island () is in Xiangshan County, Zhejiang, Xiangshan County in northeast Zhejiang Provinces of China, province, Eastern China. It is the most southeastern island in Xiangshan, located 27 miles from Shipu, Shipu Town (), near Ningbo, 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 resource ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bazaruto Island
Bazaruto () is a barrier island in the Bazaruto Archipelago of southern Mozambique. The largest island of the archipelago, Bazaruto sits near the eastern rim of the African continental shelf, sheltering the mainland coast on the other side of Bazaruto Bay. Formed during the Pleistocene, Bazaruto's sand dunes along its eastern shore are among the tallest in the world, reaching heights up to . Besides the dune system, the island is dotted with grasslands, salt marshes, mangrove swamps, and patches of freshwater wetland. It harbors a variety of wildlife, including blue monkeys, harnessed bushbuck, and red forest duiker. The waters around the island are a vital refuge for dugongs and sea turtles. Occupied since the Iron metallurgy in Africa, Iron Age, Bazaruto formed part of the Indian Ocean trade network for thousands of years. It fell under increasing Portuguese influence beginning in the late 16th century, and was administered under a series of mulatto landlords and chieftains. It ... [...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, cove ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The London Gazette
''The London Gazette'', known generally as ''The 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. 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 Gazette''. The ''London'', ''Edinburgh'' and ''Belfast Gazettes'' are published by ... [...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 Chance Brothers and Company was an English glassworks originally based in Spon Lane, Smethwick, West Midlands (county), West Midlands (formerly in Staffordshire), in England. It was a leading glass manufacturer and a pioneer of British glassma ...) 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 lig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Newfoundland (island)
Newfoundland ( , ; , ) is a large island within the Canadian province of Newfoundland and Labrador. It is situated off the eastern coast of the Northern America, North American mainland and the geographical region of Labrador. The island contains 29 percent of the province's land area, but is home to over 90% of the province's population, with about 60% of the province's population located on the small southeastern Avalon peninsula. 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 List of islands by area, world's 16th-largest island, List of Canadian islands by area, Canada's fourth-largest island, and the largest Canadian island outside Northern Can ... [...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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
