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Siren (alarm)
A siren is a noise-making warning device. There are two general types: mechanical sirens and electronic sirens. Civil defense sirens are mounted in fixed locations and used to warn of natural disasters or attacks. Sirens are used on emergency service vehicles such as ambulances, police cars, and fire engines. Many fire sirens (used for summoning volunteer firefighters) serve double duty as tornado or civil defense sirens, alerting an entire community of impending danger. Most fire sirens are either mounted on the roof of a fire station or on a pole next to the fire station. Fire sirens can also be mounted on or near government buildings, on tall structures such as water towers, as well as in systems where several sirens are distributed around a town for better sound coverage. Most fire sirens are single tone and mechanically driven by electric motors with a rotor attached to the shaft. Some newer sirens are Electronics, electronically driven speakers. Fire sirens are often cal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electronic Sirens Pavian By Telegrafia
Electronic may refer to: *Electronics, the science of how to control electric energy in semiconductors *Electronics (magazine), ''Electronics'' (magazine), a defunct American trade journal *Electronic storage, the storage of data using an electronic device *Electronic commerce or e-commerce, the trading in products or services using computer networks, such as the Internet *Electronic publishing or e-publishing, the digital publication of books and magazines using computer networks, such as the Internet *Electronic engineering, an electrical engineering discipline Entertainment *Electronic (band), an English alternative dance band **Electronic (album), ''Electronic'' (album), the self-titled debut album by British band Electronic *Electronic music, a music genre *Electronic musical instrument *Electronic game, a game that employs electronics See also *Electronica, an electronic music genre *Consumer electronics, devices including active (amplifying) electrical components {{dis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adolphe Ganot
Adolphe Ganot (born 1804 in Rochefort, Charente-Maritime Rochefort (; ), unofficially Rochefort-sur-Mer (; ) for disambiguation, is a city and communes of France, commune in Southwestern France, a port on the Charente (river), Charente estuary. It is a Subprefectures in France, subprefecture of the Cha ..., France; died 1887 in Paris Françoise Khantine-Langlois (2006?)Un siècle de physique à travers un manuel à succès: le traité de physique de Ganot century of physics through a successful textbook: Ganot's treatise on physicsbr>English translation)) was a French writer and publisher of physics textbooks. Ganot's textbooks, written during the second half of the nineteenth century, made "...a decisive contribution to physics and its teaching on an international scale". His popular ''Treatise on Physics'' (French: ''Traité de Physique'') was translated into several languages. References 19th-century French writers French science writers French textbook writers Peopl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Church (building)
A church, church building, church house, or chapel is a building used for Christian worship church service, services and Christian religion, Christian activities. The earliest identified Christian church is a house church founded between 233 AD and 256 AD. ''Church'' is also used to describe a Church (congregation), body or an assembly of Christian believers, while "the Church" may be used to refer to the worldwide Christian religious community as a whole. In traditional Christian architecture, the plan view of a church often forms a Christian cross with the centre aisle and seating representing the vertical beam and the Church architecture#Characteristics of the early Christian church building, bema and altar forming the horizontal. Towers or domes may inspire contemplation of the heavens. Modern churches have a variety of architectural styles and layouts. Some buildings designed for other purposes have been converted to churches, while many original church buildings have bee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bell (instrument)
A bell /ˈbɛl/ () is a directly struck idiophone percussion instrument. Most bells have the shape of a hollow cup that when struck vibrates in a single strong strike tone, with its sides forming an efficient resonator. The strike may be made by an internal "clapper" or "uvula", an external hammer, or—in small bells—by a small loose sphere enclosed within the body of the bell ( jingle bell). Bells are usually cast from bell metal (a type of bronze) for its resonant properties, but can also be made from other hard materials. This depends on the function. Some small bells such as ornamental bells or cowbells can be made from cast or pressed metal, glass or ceramic, but large bells such as a church, clock and tower bells are normally cast from bell metal. Bells intended to be heard over a wide area can range from a single bell hung in a turret or bell-gable, to a musical ensemble such as an English ring of bells, a carillon or a Russian zvon which are tuned to a common ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lowestoft Siren
Lowestoft ( ) is a coastal town and civil parish in the East Suffolk (district), East Suffolk district of Suffolk, England.OS Explorer Map OL40: The Broads: (1:25 000) : . As the List of extreme points of the United Kingdom, most easterly UK settlement, it is north-east of Ipswich and south-east of Norwich, and the main town in its district. Its development grew with the fishing industry and as a seaside resort with wide sandy beaches. As fishing declined, Petroleum industry, oil and gas exploitation in the North Sea in the 1960s took over. In 2021 the built-up area had a population of 71,327 and the parish had a population of 47,879. History Some of the earliest signs of settlement in Britain have been found here. Flint tools discovered in the Pakefield cliffs of south Lowestoft in 2005 allow human habitation of the area to be traced back 700,000 years.S. Parfitt et al. (2006'700,000 years old: found in Pakefield', ''British Archaeology'', January/February 2006. Retrieved 24 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Horn Loudspeaker
A horn loudspeaker is a loudspeaker or loudspeaker element which uses an horn (acoustic), acoustic horn to increase the overall efficiency of the driving element(s). A common form ''(right)'' consists of a compression driver which produces sound waves with a small metal diaphragm vibrated by an electromagnet, attached to a horn, a flaring duct to conduct the sound waves to the open air. Another type is a woofer driver mounted in a loudspeaker enclosure which is divided by internal partitions to form a zigzag flaring duct which functions as a horn; this type is called a ''folded horn'' speaker. The horn serves to improve the coupling efficiency between the speaker driver and the air. The horn can be thought of as an "acoustic transformer" that provides impedance matching between the relatively density, dense diaphragm material and the less-dense air. The result is greater acoustic output power from a given driver. The narrow part of the horn next to the driver is called the "throat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Centrifugal Fan
A centrifugal fan is a mechanical device for moving air or other gases in a direction perpendicular to the axis of rotation of the fan. Centrifugal fans often contain a ducted fan, ducted housing to direct outgoing air in a specific direction or across a heat sink; such a fan is also called a blower, blower fan, or squirrel-cage fan (because it looks like a hamster wheel). Tiny ones used in computers are sometimes called biscuit blowers. These fans move air from the rotating inlet of the fan to an outlet. They are typically used in ducted applications to either draw air through ductwork/heat exchanger, or push air through similar impellers. Compared to standard axial fans, they can provide similar air movement from a smaller fan package, and overcome higher Fluid dynamics, resistance in air streams. Centrifugal fans use the kinetic energy of the impellers to move the air stream, which in turn moves against the resistance caused by ducts, dampers and other components. Centrifu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Firth Of Clyde
The Firth of Clyde, is the estuary of the River Clyde, on the west coast of Scotland. The Firth has some of the deepest coastal waters of the British Isles. The Firth is sheltered from the Atlantic Ocean by the Kintyre, Kintyre Peninsula. The Firth lies between West Dunbartonshire in the north, Argyll and Bute in the west and Inverclyde, North Ayrshire and South Ayrshire in the east. The Kilbrannan Sound is a large arm of the Firth, separating the Kintyre Peninsula from the Isle of Arran. The Kyles of Bute separates the Isle of Bute from the Cowal, Cowal Peninsula. The Sound of Bute separates the islands of Bute and Arran. The Highland Boundary Fault crosses the Firth. The Firth also played a vital military role during World War II. The Firth is sometimes called the Clyde Waters or Clyde Sea, and is customarily considered to be part of the Irish Sea. Geography At the north of the Firth, Loch Long and the Gare Loch join the Firth; these lochs are separated by the Rosneat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ailsa Craig
Ailsa Craig (; ) is an island of in the outer Firth of Clyde, west of mainland Scotland, upon which microgranite has long been quarried to make curling stones. The now-uninhabited island comprises the remains of a magmatic pluton formed during the same period of igneous activity as magmatic rocks on the nearby Isle of Arran. The island, colloquially known as " Paddy's Milestone" because it is halfway between Belfast and Glasgow, was a haven for Catholics during the Scottish Reformation in the 16th century, but is today a bird sanctuary, providing a home for huge numbers of gannets and an increasing number of puffins. Etymology The name ''Ailsa'' comes from the Gaelic ''Allasa(n)'', earlier ''Aldasain'', which is of obscure origin. It has been suggested that it represents a contraction of ''allt Shasann'', meaning "cliff of the Saxons" (cf. ''airer Saxan'', "coastland of the Saxon", a name applied to southwestern Scotland in an early Gaelic text). The "Saxons" in questio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trinity House
The Corporation of Trinity House of Deptford Strond, also known as Trinity House (and formally as The Master, Wardens and Assistants of the Guild Fraternity or Brotherhood of the most glorious and undivided Trinity and of St Clement in the Parish of Deptford Strond in the County of Kent), is the official authority for lighthouses in England, Wales, the Channel Islands and Gibraltar. Trinity House is also responsible for the provision and maintenance of other navigational aids, such as lightvessels, buoys, and maritime radio/satellite communication systems. It is also an official deep sea pilotage authority, providing expert navigators for ships trading in Northern European waters. Trinity House is also a maritime charity, disbursing funds for the welfare of retired seamen, the training of young cadets and the promotion of safety at sea. For the financial year ending in March 2024, it spent approximately £12.3million in furtherance of its charitable objectives. Funding ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
George Henry Slight
George Henry Slight (30 September 1859 – 26 June 1934) was a Scottish engineer who established the Chilean lighthouse service. Early years Slight, the son of George Slight and Elizabeth Marshall, grew up in Edinburgh in an engineering family. After an apprenticeship as a mechanical engineer, he worked on the steamers plying the route between Britain and India. He subsequently worked for several years with Trinity House, which was responsible for the lighthouse service in England and Wales. Chile In 1893 Slight was recruited by the Chilean ambassador in London, Agustin Ross, who had been ordered by the President of Chile, Jorge Montt, to find someone suitable to establish a system of lighthouses in the country. Slight's first task on arrival in Chile was to build a lighthouse on the Evangelistas Islets at the western entrance to the Strait of Magellan in the southern part of the country, which he accomplished when the Evangelistas Lighthouse was completed in 1896. Sli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
