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Mercury Switch
A mercury switch is an electricity, electrical switch that opens and closes a electrical circuit, circuit when a small amount of the liquid metal mercury (element), mercury connects metal electrodes to close the circuit. There are several different basic designs (tilt, displacement, radial, etc.) but they all share the common design strength of non-eroding switch contacts. The most common is the ''mercury tilt switch''. It is in one state (open or closed) when tilted one direction with respect to horizontal, and the other state when tilted the other direction. This is what older style thermostats used to turn a heater or air conditioner on or off. The ''mercury displacement switch'' uses a 'plunger' that dips into a pool of mercury, raising the level in the container to contact at least one electrode. This design is used in relays in industrial applications that need to switch high current loads frequently. These relays use electromagnetic coils to pull steel sleeves inside her ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mercury Switch Without Housing
Mercury most commonly refers to: * Mercury (planet), the closest planet to the Sun * Mercury (element), a chemical element * Mercury (mythology), a Roman deity Mercury or The Mercury may also refer to: Companies * Mercury (toy manufacturer), a brand of diecast toy cars manufactured in Italy * Mercury Communications, a British telecommunications firm set up in the 1980s * Mercury Corporation, an American aircraft manufacturer * Mercury Cyclecar Company, a defunct American car company * Mercury Drug, a Philippine pharmacy chain * Mercury Energy, an electricity generation and retail company in New Zealand * Mercury Filmworks, a Canadian independent animation studio * Mercury General, a multiple-line American insurance organization * Mercury Interactive, a software testing tools vendor * Mercury Marine, a manufacturer of marine engines, particularly outboard motors * Mercury Systems, a defense-related information technology company * Mercury Technologies, a financial technology c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vending Machine
A vending machine is an automated machine that dispenses items such as snacks, beverages, cigarettes, and lottery tickets to consumers after cash, a credit card, or other forms of payment are inserted into the machine or payment is otherwise made. The first modern vending machines were developed in England in the early 1880s and dispensed postcards. Vending machines exist in many countries and, in more recent times, specialized vending machines that provide less common products compared to traditional vending machine items have been created. History The earliest known reference to a vending machine is in the work of Hero of Alexandria, an engineer and mathematician in first-century Roman Egypt. His machine accepted a coin and then dispensed wine or holy water. When the coin was deposited, it fell upon a pan attached to a lever. The lever opened a valve which let some water flow out. The pan continued to tilt with the weight of the coin until it fell off, at which point a count ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bourdon Tube
Bourdon derives from the French for bumblebee, and may refer to: * Bourdon (bell), the lowest bell in a set * Bourdon (organ pipe), a stopped organ pipe of a construction favored for low pitches * Bourdon (surname) * Drone (music): The lowest course of a lute, or the lowest drone pipe of a bagpipe, sometimes called a bourdon * Faux bourdon, fauxbourdon, faburden or falsobordone, terms applied (without perfect consistency) to a variety of music compositional techniques * Bourdon, Somme, a small town in France * Bourdon (grape), another name for the French wine grape Douce noir See also * Bourdon gauge or Bourdon tube, named after Eugène Bourdon *Boudon **Boudon noir, an alternative name for the Italian wine grape Dolcetto *Boudin (other) *Burden (other) {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pressure Switch
A pressure switch is a form of switch that operates an electrical contacts, electrical contact when a certain set fluid pressure has been reached on its input. The switch may be designed to make contact either on pressure rise or on pressure fall. Pressure switches are widely used in industry to automatically supervise and control systems that use pressurized fluids. Another type of pressure switch detects mechanical force; for example, a pressure-sensitive mat is used to automatically open doors on commercial buildings. Such sensors are also used in security alarm applications such as pressure sensitive floors. Construction and types A pressure switch for sensing fluid pressure contains a capsule, bellows, Bourdon tube, diaphragm or piston element that deforms or displaces proportionally to the applied pressure. The resulting motion is applied, either directly or through amplifying levers, to a set of switch contacts. Since pressure may be changing slowly and contacts should o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bistability
In a dynamical system, bistability means the system has two Stability theory, stable equilibrium states. A bistable structure can be resting in either of two states. An example of a mechanical device which is bistable is a light switch. The switch lever is designed to rest in the "on" or "off" position, but not between the two. Bistable behavior can occur in mechanical linkages, electronic circuits, nonlinear optical systems, chemical reactions, and physiological and biological systems. In a conservative force field, bistability stems from the fact that the potential energy has two local minimum, local minima, which are the stable equilibrium points. These rest states need not have equal potential energy. By mathematical arguments, a local maximum, an unstable equilibrium point, must lie between the two minima. At rest, a particle will be in one of the minimum equilibrium positions, because that corresponds to the state of lowest energy. The maximum can be visualized as a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hysteresis
Hysteresis is the dependence of the state of a system on its history. For example, a magnet may have more than one possible magnetic moment in a given magnetic field, depending on how the field changed in the past. Plots of a single component of the moment often form a loop or hysteresis curve, where there are different values of one variable depending on the direction of change of another variable. This history dependence is the basis of memory in a hard disk drive and the remanence that retains a record of the Earth's magnetic field magnitude in the past. Hysteresis occurs in ferromagnetic and ferroelectricity, ferroelectric materials, as well as in the deformation (mechanics), deformation of rubber bands and shape-memory alloys and many other natural phenomena. In natural systems, it is often associated with irreversible process, irreversible thermodynamic change such as phase transitions and with internal friction; and dissipation is a common side effect. Hysteresis can be fou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thermostat
A thermostat is a regulating device component which senses the temperature of a physical system and performs actions so that the system's temperature is maintained near a desired setpoint. Thermostats are used in any device or system that heats or cools to a setpoint temperature. Examples include building heating, central heating, air conditioners, HVAC systems, water heaters, as well as kitchen equipment including ovens and refrigerators and medical and scientific incubators. In scientific literature, these devices are often broadly classified as thermostatically controlled loads (TCLs). Thermostatically controlled loads comprise roughly 50% of the overall electricity demand in the United States. A thermostat operates as a "closed loop" control device, as it seeks to reduce the error between the desired and measured temperatures. Sometimes a thermostat combines both the sensing and control action elements of a controlled system, such as in an automotive thermostat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bimetal
Bimetal refers to an object that is composed of two separate metals joined together. Instead of being a mixture of two or more metals, like alloys, bimetallic objects consist of layers of different metals. Trimetal and tetrametal refer to objects composed of three and four separate metals respectively. A bimetal bar is usually made of brass and iron. Bimetallic strips and disks, which convert a temperature change into mechanical displacement, are the most recognized bimetallic objects due to their name. However, there are other common bimetallic objects. For example, tin cans consist of steel covered with tin. The tin prevents the can from rusting. To cut costs and prevent people from melting them down for their metal, coins are often composed of a cheap metal covered with a more expensive metal. For example, the United States penny was changed from 95% copper to 95% zinc, with a thin copper plating to retain its appearance. A common type of trimetallic object (before the all-alu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Confined Space
A confined space is a space with limited entry and egress and not suitable for human inhabitants. Alternative names for a confined space are enclosed space and dangerous space. An example is the interior of a storage tank, occasionally entered by maintenance workers but not intended for human occupancy. Hazards in a confined space often include harmful dust or gases, asphyxiation, submersion in liquids or free-flowing granular solids (for example, grain bins), electrocution, or entrapment.BP International Ltd. ''Confined Space Entry'', Institution of Chemical Engineers 2005 pp. 1-14 Confined space accidents are of particular concern in occupational safety and health due to the hazards that they pose to the victim and subsequently to a rescue team. Confined space training outlines the skills and protocols for safe entry to confined spaces, and includes precautions such as locking and tagging out connecting piping, testing of breathable air quality, forced ventilation, observatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bečej
Bečej (, ; , ) is a town and municipality located in the South Bačka District of the autonomous province of Vojvodina, Serbia. The town has a population of 19,492, while the municipality has 30,681 inhabitants. History Bečej was mentioned first during the administration of the Kingdom of Hungary in 1091 under its Latin name Bechey and later in 1238 under Hungarian name Becse. The name probably originated from the Bechey family that had possessions in this area. In the 15th century (from 1419 to 1441) the town was a possession of the Serbian despot Đurađ Branković. Expecting the upcoming defeat of the Serbian Despotate Đurađ Branković transferred all of his movable assets to Bečej before his death in 1456. In the end of the 15th century, the army of the Kingdom of Hungary led by Serbian despot Vuk Grgurević (Zmaj Ognjeni Vuk) defeated the Ottoman army near Bečej. In 1551, an Ottoman army led by Mehmed paša Sokolović conquered the town. Bečej was administered by th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Serbia
, image_flag = Flag of Serbia.svg , national_motto = , image_coat = Coat of arms of Serbia.svg , national_anthem = () , image_map = , map_caption = Location of Serbia (green) and the claimed but uncontrolled territory of Kosovo (light green) in Europe (dark grey) , image_map2 = , capital = Belgrade , coordinates = , largest_city = capital , official_languages = Serbian language, Serbian , ethnic_groups = , ethnic_groups_year = 2022 , religion = , religion_year = 2022 , demonym = Serbs, Serbian , government_type = Unitary parliamentary republic , leader_title1 = President of Serbia, President , leader_name1 = Aleksandar Vučić , leader_title2 = Prime Minister of Serbia, Prime Minister , leader_name2 = Đuro Macut , leader_title3 = Pres ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
