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Civil Defense Siren
A civil defense siren, also known as an air-raid siren or tornado siren, is a siren used to provide an emergency population warning to the general population of approaching danger. It is sometimes sounded again to indicate the danger has passed. Some sirens, especially within small towns, are also used to call the volunteer fire department when needed. Initially designed to warn city dwellers of air raids in World War II, they were later used to warn of nuclear attack and natural destructive weather patterns, such as tornadoes. The generalized nature of sirens led to many of them being replaced with more specific warnings, such as the broadcast-based Emergency Alert System and the Cell Broadcast-based Wireless Emergency Alerts and EU-Alert mobile technologies. A mechanical siren generates sound by spinning a slotted chopper wheel to interrupt a stream of air at a regular rate. Modern sirens can develop a sound level of up to 135 decibels at . The Chrysler air raid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TWS 295 Sirens, Saudi Arabia Warning System
TWS may refer to: * '' Captain America: The Winter Soldier'' – a 2014 film * Texas World Speedway – a road-racing track in College Station, Texas * The Weekly Standard * The White Stripes – an American rock band * ''The White Stripes'' (album) – 1999 debut album by The White Stripes * The Wilberforce Society – a Cambridge-based think tank * The Wilderness Society (Australia) The Wilderness Society is an Australian, community-based, not-for-profit non-governmental environmental advocacy organisation. Its vision is to "transform Australia into a society that protects, respects and connects with the natural world that ... * The Wilderness Society (United States) * The Williams School * Thermal weapon sight * Toad the Wet Sprocket * Track while scan – a radar mode * True wind speed; see Apparent wind#Apparent wind in sailing * True Wireless Stereo; see Headphones#True wireless * Tsunami warning system {{Disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Local Access Alert
The Local Access Alert (also known as Local Access System or Emergency Override System) is a warning system designed to warn radio, television stations, cable television broadcast feeds or satellite signals of impending dangers, such as tornadoes, flash flooding and other civil emergencies. The system was largely replaced by the Emergency Alert System in the United States, although it still exists in some areas which have not yet been upgraded, and is still used from time to time in areas that have upgraded to the EAS. The Local Access Alert was used by local law enforcement agencies and emergency management staff, and it's much like the antiquated Emergency Broadcast System. A public servant would dial up a number and PIN through a phone to take control of a certain cable city or cluster in the path of danger. Once the number and PIN are entered, it switches all cable subscribers, regardless of what channel they're on, to a black screen or static and uses a distinct attention sig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Supercharger
In an internal combustion engine, a supercharger compresses the intake gas, forcing more air into the engine in order to produce more power for a given displacement. The current categorisation is that a supercharger is a form of forced induction that is mechanically powered (usually by a belt from the engine's crankshaft), as opposed to a turbocharger, which is powered by the kinetic energy of the exhaust gasses. However, up until the mid-20th century, a turbocharger was called a "turbosupercharger" and was considered a type of supercharger. The first supercharged engine was built in 1878, with usage in aircraft engines beginning in the 1910s and usage in car engines beginning in the 1920s. In piston engines used by aircraft, supercharging was often used to compensate for the lower air density at high altitudes. Supercharging is less commonly used in the 21st century, as manufacturers have shifted to turbochargers to reduce fuel consumption and/or increase power outputs. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Federal Signal 3T22
The Federal Signal 3T22 / 2T22 was a dual tone, mechanical outdoor warning siren made by Federal Signal Corporation (formerly Federal Sign and Signal Corporation) from 1952 through the early 1990s. It has a very recognizable design, having a ten-port rotor (chopper) on the bottom with ten cones (horns) and a 12-port one on top with twelve cones. History The Federal Signal 3T22 was originally designed as the 2T22 in 1952 or 1954. The 2T22 had the same number of ports and cones. It could produce two main signals (it could produce more but the other signals were rarely used), hence the name "2T22" (the 2 at front representing the 2 choppers, and the 22 representing the amount of horns). The siren had no solenoids, so it could not perform a "hi-lo" signal. In 1955, Federal designed the 3T22, which was similar, except for its name and that it had solenoids. The 3T22 was superior in design because it could perform the "hi-lo" signal, which is mainly used for fire calls. The 2T22 and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cold War
The Cold War is a term commonly used to refer to a period of geopolitical tension between the United States and the Soviet Union and their respective allies, the Western Bloc and the Eastern Bloc. The term '' cold war'' is used because there was no large-scale fighting directly between the two superpowers, but they each supported major regional conflicts known as proxy wars. The conflict was based around the ideological and geopolitical struggle for global influence by these two superpowers, following their temporary alliance and victory against Nazi Germany and Imperial Japan in 1945. Aside from the nuclear arsenal development and conventional military deployment, the struggle for dominance was expressed via indirect means such as psychological warfare, propaganda campaigns, espionage, far-reaching embargoes, rivalry at sports events, and technological competitions such as the Space Race. The Western Bloc was led by the United States as well as a number of othe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vane
Vane may refer to: People * Vane (surname) * Vane Featherston (1864–1948), English stage actress * Ivan Vane Ivanović (1913–1999), Yugoslav-British athlete, shipowner, political activist, and philanthropist * Vane Pennell (1876–1938), English rackets and real tennis player * Viscount Vane, an extinct title in the Peerage of Ireland Places * Vanë, a settlement in Albania * Vane, Avatime, a populated place in Ghana * Vāne Parish, Latvia * Vane Glacier, Marie Byrd Land, Antarctica Other uses * ''Vane'' (album), the only album by Bleak, released in 1995 * Parts besides the shaft in a pennaceous feather * A plastic fin on an arrow * D-alanine—D-serine ligase, an enzyme (VanE) * Vane, singular form of Vanir, a group of gods in Norse mythology * ''Vane (video game)'', a video game released for the Playstation 4 See also * Vane display, a type of 7-segment display * Vane anemometer * Cooper vane * Rotary vane pump * Weather vane * Vanes Martirosyan Vanes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stator
The stator is the stationary part of a rotary system, found in electric generators, electric motors, sirens, mud motors or biological rotors. Energy flows through a stator to or from the rotating component of the system. In an electric motor, the stator provides a magnetic field that drives the rotating armature; in a generator, the stator converts the rotating magnetic field to electric current. In fluid powered devices, the stator guides the flow of fluid to or from the rotating part of the system. Design Motor stators are made either from iron/steel or from a printed circuit board (PCB). Originally applied to low-power applications, PCB stators can be lighter, smaller, and less noisy. One design embeds thin copper traces in the PCB stator that serve as the windings. The traces are interleaved with epoxy-glass laminates, that insulate each coil from its neighbors. An air core replaces the traditional iron core, saving space and weight, and allowing a smaller air gap. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rotor (electric)
The rotor is a moving component of an electromagnetic system in the electric motor, electric generator, or alternator. Its rotation is due to the interaction between the windings and magnetic fields which produces a torque around the rotor's axis.Staff. "Understanding Alternators. What Is an Alternator and How Does It Work." N.p., n.d. Web. 24 November 2014 . Early development An early example of electromagnetic rotation was the first rotary machine built by Ányos Jedlik with electromagnets and a commutator, in 1826-27. Other pioneers in the field of electricity include Hippolyte Pixii who built an alternating current generator in 1832, and William Ritchie's construction of an electromagnetic generator with four rotor coils, a commutator and brushes, also in 1832. Development quickly included more useful applications such as Moritz Hermann Jacobi's motor that could lift 10 to 12 pounds with a speed of one foot per second, about 15 watts of mechanical power in 1834. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
3T22 Sandy, Oregon
3T is an American band. 3T may also refer to: * 3T Cycling, an Italian cycle sport company * ''3T'', the debut solo album by South African rapper YoungstaCPT * OnePlus 3T, Android smartphone released in 2016 * Turan Air's IATA code * Censorship in China, Taiwan, Tiananmen, Tibet See also *T3 (other) *TTT (other) {{Letter-NumberCombDisambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ACA Allertor 125 Video
ACA may refer to: Arts and entertainment * ''A Current Affair'' (Australian TV series), an Australian television program * Actors Centre Australia, a private dramatic arts school * American Choreography Awards * American Composers Alliance * American Council for the Arts, now part of Americans for the Arts * American Country Awards * A.C.E (South Korean band) Business * Alerting Communicators of America, an earlier name of American Signal Corporation * Angel Capital Association * Astronautics Corporation of America * Australian Coal Association Government and politics * Affordable Care Act, shorthand for the Patient Protection and Affordable Care Act, commonly called "Obamacare" * Allied Commission for Austria * Anti-Corruption Agency, a Malaysian government agency * Australian Coal Association * Australian Communications Authority Historical * Army Comrades Association, or "Blueshirts", a political organization in 1930s Ireland * Armed Peasant Association (Spanish: ), ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Public Switched Telephone Network
The public switched telephone network (PSTN) provides infrastructure and services for public telecommunication. The PSTN is the aggregate of the world's circuit-switched telephone networks that are operated by national, regional, or local telephony operators. These consist of telephone lines, fiber optic cables, microwave transmission links, cellular networks, communications satellites, and undersea telephone cables, all interconnected by switching centers which allow most telephones to communicate with each other. Originally a network of fixed-line analog telephone systems, the PSTN is now almost entirely digital in its core network and includes mobile and other networks, as well as fixed telephones. The technical operation of the PSTN adheres to the standards created by the ITU-T. These standards allow different networks in different countries to interconnect seamlessly. The E.163 and E.164 standards provide a single global address space for telephone numbers. The com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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