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Tripod (mathematics)
A tripod is a portable three-legged frame or stand, used as a platform for supporting the weight and maintaining the stability of some other object. The three-legged (triangular stance) design provides good stability against gravitational loads as well as horizontal shear forces, and better leverage for resisting tipping over due to lateral forces can be achieved by spreading the legs away from the vertical centre. Variations with one, two, and four legs are termed ''monopod'', ''bipod'', and ''quadripod'' (similar to a table). Etymology First attested in English in the early 17th century, the word ''tripod'' comes via Latin ''tripodis'' (GEN of ''tripus''), which is the romanization of Greek (''tripous''), "three-footed" (GEN , ''tripodos''), ultimately from (''tri-''), "three times" (from , ''tria'', "three") + (''pous''), "foot". The earliest attested form of the word is the Mycenaean Greek , ''ti-ri-po'', written in Linear B syllabic script. Cultural use Many culture ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Weight
In science and engineering, the weight of an object is the force acting on the object due to gravity. Some standard textbooks define weight as a Euclidean vector, vector quantity, the gravitational force acting on the object. Others define weight as a scalar quantity, the magnitude of the gravitational force. Yet others define it as the magnitude of the reaction (physics), reaction force exerted on a body by mechanisms that counteract the effects of gravity: the weight is the quantity that is measured by, for example, a spring scale. Thus, in a state of free fall, the weight would be zero. In this sense of weight, terrestrial objects can be weightless: ignoring Drag (physics), air resistance, the famous apple falling from the tree, on its way to meet the ground near Isaac Newton, would be weightless. The unit of measurement for weight is that of force, which in the International System of Units (SI) is the newton (unit), newton. For example, an object with a mass of one kilogram ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Greece
Greece,, or , romanized: ', officially the Hellenic Republic, is a country in Southeast Europe. It is situated on the southern tip of the Balkans, and is located at the crossroads of Europe, Asia, and Africa. Greece shares land borders with Albania to the northwest, North Macedonia and Bulgaria to the north, and Turkey to the northeast. The Aegean Sea lies to the east of the Geography of Greece, mainland, the Ionian Sea to the west, and the Sea of Crete and the Mediterranean Sea to the south. Greece has the longest coastline on the Mediterranean Basin, featuring List of islands of Greece, thousands of islands. The country consists of nine Geographic regions of Greece, traditional geographic regions, and has a population of approximately 10.4 million. Athens is the nation's capital and List of cities and towns in Greece, largest city, followed by Thessaloniki and Patras. Greece is considered the cradle of Western culture, Western civilization, being the birthplace of Athenian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tripod Head
A tripod head is the part of a tripod system that attaches the supported device (such as a camera) to the tripod legs, and allows the orientation of the device to be manipulated or locked down. Modular or stand-alone tripod heads can be used on a wide range of tripods, allowing the user to choose which type of head best suits their needs. Integrated heads are built directly onto the tripod legs, reducing the cost of the tripod system. The main function of any tripod head is to provide the ability to hold the attached device fixed in a specific orientation until the user needs to change its position. In the case of a photographic camera, this can help reduce vibration that would appear when using relatively slow shutter speeds while still being able to quickly recompose for another shot, or allow for very long exposures. In cinematography or video applications, a tripod head allows the camera operator to pan and tilt with much more control when compared to hand-holding the came ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vise
A vise or vice (British English) is a mechanical apparatus used to secure an object to allow work to be performed on it. Vises have two parallel jaws, one fixed and the other movable, threaded in and out by a screw and lever. A vise grip is not a vise but a pair of lever-actuated locking pliers. Types Face A face vise is the standard woodworking vise, always securely attached to a workbench flush with its work surface. Its jaws are made of wood or metal, the latter usually faced with wood, called cheeks, to avoid marring the work. The movable jaw may include a retractable dog to hold work against a bench dog. A "quick-release" woodworker's vise employs a split nut that allows the screw to engage or disengage with a half-turn of the handle. When disengaged the movable jaw may be moved in or out throughout its entire range of motion, vastly speeding up the process of adjustment. Common thread types are Acme and buttress. Traditional woodworking workbench vises are common ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tripod Saddle
A weapon mount is an assembly or mechanism used to hold a weapon (typically a gun) onto a platform in order for it to function at maximum capacity. Weapon mounts can be broken down into two categories: static mounts and non-static mounts. Static mount A static mount is a non-portable weapon support component either mounted directly to the ground, on a fortification, or as part of a vehicle. Turret A gun turret protects the crew or mechanism of a weapon and at the same time lets the weapon be aimed and fired in many directions. A turret is a rotating weapon platform, strictly one that crosses the armour of whatever it is mounted on with a structure called a barbette (on ships) or basket (on tanks) and has a protective structure on top (gunhouse). If it has no gunhouse it is a barbette, if it has no barbette (ie, it is mounted to the outside of the vehicle's armour) it is an installation. Turrets are typically used to mount machine guns, autocannons or large-calibre guns. They ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rifle
A rifle is a long-barreled firearm designed for accurate shooting, with a barrel that has a helical pattern of grooves ( rifling) cut into the bore wall. In keeping with their focus on accuracy, rifles are typically designed to be held with both hands and braced firmly against the shooter's shoulder via a buttstock for stability during shooting. Rifles are used extensively in warfare, law enforcement, hunting, shooting sports, and crime. The term was originally ''rifled gun'', with the verb ''rifle'' referring to the early modern machining process of creating groovings with cutting tools. By the 20th century, the weapon had become so common that the modern noun ''rifle'' is now often used for any long-shaped handheld ranged weapon designed for well-aimed discharge activated by a trigger (e.g., personnel halting and stimulation response rifle, which is actually a laser dazzler). Like all typical firearms, a rifle's projectile (bullet) is propelled by the contained def ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
US Navy 070406-N-0775Y-078 Equipment Operator 1st Class Shannon Farber Instructs Mass Communication Specialist 1st Class Carmichael Yepez How To Aim A M-240B Machine Gun During A Weapons Training Exercise At A Range In Camp Han
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Indian reservations. The United States is also in free association with three Pacific Island sovereign states: the Federated States of Micronesia, the Marshall Islands, and the Republic of Palau. It is the world's third-largest country by both land and total area. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 million, it is the most populous country in the Americas and the third most populous in the world. The national capital of the United States is Washington, D.C. and its most populous city and principal financial center is New York City. Paleo-Americans ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lebes
The lebes (Greek 'λέβης', plural ''lebetes'') is a type of ancient Greek cauldron, normally in bronze. It is a deep bowl with a rounded bottom. It was often supported by a sacrificial tripod. In classical times, a foot was attached and it was typically used as a cooking pot. Variants Tripod lebes The tripod lebes is characterized by two round vertical handles and by three strut-supported legs. All were separately cast then riveted to the cauldron. Artefactual evidence indicates the tripod lebes was not used as a mixing bowl, even long after it lost its role as a cooking pot. Lebes gamikos The lebes gamikos (pl. lebetes gamikoi), or ''nuptial lebes'', appears to have been a part of pre-wedding purification ceremonies, and was often made in pottery. It may have stood by the bride's door and was probably used in ritual sprinkling of the bride with water. Lebetes gamikoi stood on variously long or short bases and each typically was painted with a scene of a wedding procession ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xinjiang
Xinjiang, SASM/GNC: ''Xinjang''; zh, c=, p=Xīnjiāng; formerly romanized as Sinkiang (, ), officially the Xinjiang Uygur Autonomous Region (XUAR), is an autonomous region of the People's Republic of China (PRC), located in the northwest of the country at the crossroads of Central Asia and East Asia. Being the largest province-level division of China by area and the 8th-largest country subdivision in the world, Xinjiang spans over and has about 25 million inhabitants. Xinjiang borders the countries of Mongolia, Russia, Kazakhstan, Kyrgyzstan, Tajikistan, Afghanistan, Pakistan and India. The rugged Karakoram, Kunlun and Tian Shan mountain ranges occupy much of Xinjiang's borders, as well as its western and southern regions. The Aksai Chin and Trans-Karakoram Tract regions, both administered by China, are claimed by India. Xinjiang also borders the Tibet Autonomous Region and the provinces of Gansu and Qinghai. The most well-known route of the historic Silk Ro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ding (vessel)
''Ding'' () are prehistoric and ancient Chinese cauldrons, standing upon legs with a lid and two facing handles. They are one of the most important shapes used in Chinese ritual bronzes. They were made in two shapes: round vessels with three legs and rectangular ones with four, the latter often called ''fangding''. They were used for cooking, storage, and ritual offerings to the gods or to ancestors. The earliest recovered examples are pre-Shang ceramic ding at the Erlitou site but they are better known from the Bronze Age, particularly after the Zhou deemphasized the ritual use of wine practiced by the Shang kings. Under the Zhou, the ding and the privilege to perform the associated rituals became symbols of authority. The number of permitted ding varied according to one's rank in the Chinese nobility: the Nine Ding of the Zhou kings were a symbol of their rule over all China but were lost by the first emperor, Shi Huangdi in the late 3rd century BCE. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peiligang
The Peiligang culture was a Neolithic culture in the Yi-Luo river basin (in modern Henan Province, China) that existed from 7000 to 5000 BC. Over 100 sites have been identified with the Peiligang culture, nearly all of them in a fairly compact area of about 100 square kilometers in the area just south of the river and along its banks. Peiligang culture The culture is named after the site discovered in 1977 at Peiligang, a village in Xinzheng County. Archaeologists believe that the Peiligang culture was egalitarian, with little political organization. The culture practiced agriculture in the form of cultivating millet and animal husbandry in the form of raising pigs and possibly poultry. The people hunted deer and wild boar, and fished for carp in the nearby river, using nets made from hemp fibers. The culture is also one of the oldest in ancient China to make pottery. This culture typically had separate residential and burial areas, or cemeteries, like most Neolithic culture ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cishan Culture
The Cishan culture (6500–5000 BC) was a Neolithic culture in northern China, on the eastern foothills of the Taihang Mountains. The Cishan culture was based on the farming of broomcorn millet, the cultivation of which on one site has been dated back 10,000 years. The people at Cishan also began to cultivate foxtail millet around 8700 years ago. However, these early dates have been questioned by some archaeologists due to sampling issues and lack of systematic surveying. Common artifacts from the Cishan culture include stone grinders, stone sickles and tripod pottery. The sickle blades feature fairly uniform serrations, which made the harvesting of grain easier. Cord markings, used as decorations on the pottery, was more common compared to neighboring cultures. Also, the Cishan potters created a broader variety of pottery forms such as basins, pot supports, serving stands, and drinking cups. Since the culture shared many similarities with its southern neighbor, the Peiligan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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