Lundy North Lighthouse
The isle of Lundy has three lighthouses: a pair of active lights built in 1897 and a preserved older lighthouse dating from 1819. The old lighthouse (together with the adjacent keepers' accommodation) is a Grade II* listed building and the tower is a scheduled monument. An associated Fog signal station, fog signal Gun battery, battery is also a scheduled monument containing several Grade II listed structures. The North and South lighthouses are also Grade II listed buildings. The Old Light and its associated keepers' house are today kept open by the Landmark Trust. The North and South lighthouses are run and maintained by Trinity House, the general lighthouse authority for England and Wales; nowadays they are fully automated, and monitored via a telemetry link from Harwich. Old light Foundations for a lighthouse on Lundy were laid in 1787, but the first Lundy Lighthouse (now known as the Old Light) was not built until Trinity House obtained a 999-year lease in 1819. The granit ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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Lundy
Lundy is an English island in the Bristol Channel. It forms part of the district of Torridge in the county of Devon. About long and wide, Lundy has had a long and turbulent history, frequently changing hands between the British crown and various usurpers. In the 1920s, the island's owner, Martin Harman, tried to issue his own coinage and was fined. In 1941, two German Heinkel He 111 bombers crash landed on the island, and their crews were captured. In 1969, Lundy was purchased by British millionaire Jack Hayward, who donated it to the National Trust. It is now managed by the Landmark Trust, a conservation charity that derives its income from day trips and holiday lettings, most visitors arriving by boat from Bideford or Ilfracombe. A local tourist curiosity is the special "Puffin" postage stamp, a category known by philatelists as "local carriage labels", a collectors' item. As a steep, rocky island, often shrouded by fog, Lundy has been the scene of many shipwrec ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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Cherbourg-Octeville
Cherbourg-Octeville () is a former commune in the Manche department in Normandy in north-western France.Commune déléguée de Cherbourg-Octeville INSEE It was formed when and Octeville merged on 28 February 2000.Décret 23 February 2000 On 1 January 2016, it was merged into the new commune of Cherbourg-en-C ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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Lundy Island , North West Point - Geograph
Lundy is an English island in the Bristol Channel. It forms part of the district of Torridge in the county of Devon. About long and wide, Lundy has had a long and turbulent history, frequently changing hands between the British crown and various usurpers. In the 1920s, the island's owner, Martin Harman, tried to issue his own coinage and was fined. In 1941, two German Heinkel He 111 bombers crash landed on the island, and their crews were captured. In 1969, Lundy was purchased by British millionaire Jack Hayward, who donated it to the National Trust. It is now managed by the Landmark Trust, a conservation charity that derives its income from day trips and holiday lettings, most visitors arriving by boat from Bideford or Ilfracombe. A local tourist curiosity is the special "Puffin" postage stamp, a category known by philatelists as "local carriage labels", a collectors' item. As a steep, rocky island, often shrouded by fog, Lundy has been the scene of many shipwrecks, and ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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Fog Signals
A foghorn or fog signal is a device that uses sound to warn vehicles of navigational hazards such as rocky coastlines, or boats of the presence of other vessels, in foggy conditions. The term is most often used in relation to marine transport. When visual navigation aids such as lighthouses are obscured, foghorns provide an audible warning of rock outcrops, shoals, headlands, or other dangers to shipping. Description All foghorns use a vibrating column of air to create an audible tone, but the method of setting up this vibration differs. Some horns, such as the Daboll trumpet, used vibrating plates or metal reeds, a similar principle to a modern electric car horn. Others used air forced through holes in a rotating cylinder or disk, in the same manner as a siren. Semi-automatic operation of foghorns was achieved by using a clockwork mechanism (or "coder") to sequentially open the valves admitting air to the horns; each horn was given its own timing characteristics to help mari ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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Thomas Matthews (engineer)
Sir Thomas Matthews (8 August 1849 – 13 January 1930) was a British civil engineer, who was a notable builder of lighthouses. He was the brother of Sir William Matthews, also a prominent civil engineer. During the late 19th and early 20th century Thomas Matthews was the Engineer-in-Chief of Trinity House. Biography Thomas Matthews was born in Penzance, Cornwall, where he was the son of the Borough Surveyor, John Matthews. From 1868 to 1871 he assisted his father in providing drinking water for Penzance and the sea and harbour defences. For the following two years he practised as an architect and surveyor in Penzance. In 1874, he entered the employment of the United Kingdom's lighthouse service, Trinity House, as an assistant engineer. He succeeded Sir James Nicholas Douglass as Engineer-in-Chief when the latter retired in 1892. Matthews went on to design over a dozen lighthouses for Trinity House. He also worked on illumination systems, notably a lamp designed to burn ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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Daymark
A daymark is a navigational aid for sailors and maritime pilot, pilots, distinctively marked to maximize its visibility in daylight. The word is also used in a more specific, technical sense to refer to a signboard or daytime identifier that is attached to a day beacon or other aid to navigation. In that sense, a daymark conveys to the mariner during daylight hours the same significance as the aid's light or reflector does at night. Standard signboard shapes are square, triangular, and rectangular, while the standard colours are red, green, orange, yellow, and black. Notable daymarks * Trinity House Obelisk, UK * Kingswear Daymark, UK * Tasku beacon tower, Finland * Keskiniemi beacon tower, Finland * Hiidenniemi beacon tower, Finland * Laitakari beacon tower, Finland * Herring Tower, Langness, Isle of Man * Le Hocq, Jersey * La Tour Cârrée, Jersey * Scharhörnbake, Germany Symbols used on US charts Chart symbols used by the US National Oceanic and Atmospheric Administrati ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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Guncotton
Nitrocellulose (also known as cellulose nitrate, flash paper, flash cotton, guncotton, pyroxylin and flash string, depending on form) is a highly flammable compound formed by nitrating cellulose through exposure to a mixture of nitric acid and sulfuric acid. One of its first major uses was as guncotton, a replacement for gunpowder as propellant in firearms. It was also used to replace gunpowder as a low-order explosive in mining and other applications. In the form of collodion, it was also a critical component in an early photographic emulsion, the use of which revolutionized photography in the 1860s. In the 20th century, it was adapted to automobile lacquer and adhesives. Production The process uses a mixture of nitric acid and sulfuric acid to convert cellulose into nitrocellulose. The quality of the cellulose is important. Hemicellulose, lignin, pentosans, and mineral salts give inferior nitrocelluloses. In organic chemistry, nitrocellulose is a nitrate ester, not a ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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One Of The Old Cannon - Geograph
1 (one, unit, unity) is a number, numeral, and glyph. It is the first and smallest positive integer of the infinite sequence of natural numbers. This fundamental property has led to its unique uses in other fields, ranging from science to sports, where it commonly denotes the first, leading, or top thing in a group. 1 is the unit of counting or measurement, a determiner for singular nouns, and a gender-neutral pronoun. Historically, the representation of 1 evolved from ancient Sumerian and Babylonian symbols to the modern Arabic numeral. In mathematics, 1 is the multiplicative identity, meaning that any number multiplied by 1 equals the same number. 1 is by convention not considered a prime number. In digital technology, 1 represents the "on" state in binary code, the foundation of computing. Philosophically, 1 symbolizes the ultimate reality or source of existence in various traditions. In mathematics The number 1 is the first natural number after 0. Each natural number, ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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South Bishop Lighthouse
The South Bishop Lighthouse is a lighthouse on South Bishop Island (also known as Emsger), a small rock approximately west of St Davids Head in Pembrokeshire, Wales. History In 1831 the traders of the port of Cardigan made an application to build a light, and this was authorised in 1834. Designed by James Walker, the lighthouse was built on the island in 1839, acting both as a waymark for vessels navigating offshore and as assistance to ships navigating around the Bishops and Clerks island group. The lighthouse was converted to electric operation in 1959, and in 1971 a helipad was constructed at the site. Finally, the lighthouse was automated and demanned in 1983. Like many in the UK, it is now monitored from the control centre at Trinity House in Harwich, Essex, England. Architecture The tower is built of granite, and is circular with a slight taper. A cornice at the top of the tower has iron railings, this is unusual in lighthouses designed by James Walker. Accommodati ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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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 glassmaking technology. The Chance family originated in Bromsgrove in Worcestershire as farmers and craftsmen, before setting up business in Smethwick in 1822. Situated between Birmingham and the Black Country in the agglomeration of the Midlands industrial heartland, they took advantage of the skilled workers, canals and many advances that were taking place in the industrial West Midlands (region), West Midlands at the time. Throughout its almost two centuries of history many changes affected the company which, now in private ownership, continues to function as Chance Glass Limited, a specialized industrial glass manufacturer in Malvern, Worcestershire at one of its small subsidiary factories. The social and economic impact of the company on t ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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Catadioptric
A catadioptric optical system is one where refraction and reflection are combined in an optical system, usually via lenses ( dioptrics) and curved mirrors ( catoptrics). Catadioptric combinations are used in focusing systems such as searchlights, headlamps, early lighthouse focusing systems, optical telescopes, microscopes, and telephoto lenses. Other optical systems that use lenses and mirrors are also referred to as "catadioptric", such as surveillance catadioptric sensors. Early catadioptric systems Catadioptric combinations have been used for many early optical systems. In the 1820s, Augustin-Jean Fresnel developed several catadioptric lighthouse reflector versions of his Fresnel lens. Léon Foucault developed a catadioptric microscope in 1859 to counteract aberrations of using a lens to image objects at high power. In 1876 a French engineer, A. Mangin, invented what has come to be called the Mangin mirror, a concave glass reflector with the silver surface on th ... [...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]   |
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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]   |