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Sledgehammer
A sledgehammer is a tool with a large, flat, massive, often metal head, attached to a long wooden or solid handle. The long handle is combined with a heavy head which allows the sledgehammer to pick up momentum during a swing and applying a large force compared to hammers designed to drive nails. Along with the mallet, it shares the ability to distribute force over a wide area. This is in contrast to other types of hammers, which concentrate gravity and force in a relatively small area. Etymology The word sledgehammer is derived from the Old-English "''slægan''", which, in its first sense, means "to strike violently". The English words "slag", "slay", and "slog" are cognates. Uses The handle can range from to a full long, depending on the mass of the head. The head mass is usually . Modern heavy duty sledgehammers come with heads. Sledgehammers usually require two hands and a swinging motion involving the entire torso, in contrast to smaller hammers used for driving in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hammer
A hammer is a tool, most often a hand tool, consisting of a weighted "head" fixed to a long handle that is swung to deliver an impact to a small area of an object. This can be, for example, to drive nail (fastener), nails into wood, to shape metal (as with a forge), or to crush Rock (geology), rock. Hammers are used for a wide range of driving, shaping, breaking and non-destructive striking applications. Traditional disciplines include carpentry, blacksmithing, war hammer, warfare, and mallet percussion, percussive musicianship (as with a gong). Hammering is use of a hammer in its strike capacity, as opposed to pry bar, prying with a secondary claw or grappling with a secondary hook. Carpentry and blacksmithing hammers are generally wielded from a stationary stance against a stationary target as gripped and propelled with one arm, in a lengthy downward plane (geometry), planar arc—downward to add kinetic energy to the impact—pivoting mainly around the shoulder and elbo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Improvised Weapon
An improvised weapon is an object that was not designed to be used as a weapon but can be put to that use. They are generally used for self-defence or if the person is otherwise unarmed. In some cases, improvised weapons are commonly used by attackers in street fights, muggings, murders, gang warfare, during riots, or even during insurgencies, usually when conventional weapons such as firearms are unavailable or inappropriate. Improvised weapons are common everyday objects that can be used in a variety of defensive applications. The objects are generally used in their normal state; they are not physically altered in any way to make them more functional as weapons. Examples Other than items designed as weapons, any object that can be used to cause bodily harm can be considered an improvised weapon. Examples of items that have been used as improvised weapons include: *Sports equipment, such as baseball bats, golf clubs, cricket bats, hockey sticks, dumbbells, and cue sticks ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hand Steel
Hand steel is mining with the use of a chisel-like tool. The chisel is struck violently with a striking tool, usually with a sledgehammer. It is one of the several mining techniques used in traditional mining and one of the several with the use of basic hand tools. Hand steel was used in the 19th and 20th centuries for surface and underground mining Mining is the extraction of valuable geological materials and minerals from the surface of the Earth. Mining is required to obtain most materials that cannot be grown through agricultural processes, or feasibly created artificially in a la .... References Traditional mining Hand tools {{mining-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
War Hammer
A war hammer (French: ''martel-de-fer'', "iron hammer") is a weapon that was used by both infantry, foot soldiers and cavalry. It is a very old weapon and gave its name, owing to its constant use, to Judas Maccabeus, Judah Maccabee, a 2nd-century BC Jewish rebel, and to Charles Martel, one of the rulers of France. In the 15th and 16th centuries, the war hammer became an elaborately decorated and handsome weapon. The war hammer was a popular weapon in the late Middle Ages, medieval period. It became somewhat of a necessity in combat when armor became so strong that swords and axes were no longer able to pierce and ricocheted upon impact. The war hammer could inflict significant damage on the enemy through their heavy impact without the need to pierce the armor. Design A war hammer consists of a handle and a head. The length of the handle may vary, the longest being roughly equivalent to that of a halberd (five to six feet or 1.5 to 1.8 meters), and the shortest about the same as t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iranian Embassy Siege
The Iranian Embassy siege took place from 30 April to 5 May 1980, after a group of six armed men stormed the Embassy of Iran, London, Iranian embassy on Prince's Gate in South Kensington, London. The gunmen, Iranian Arabs campaigning for the sovereignty of the Khuzestan Province of Iran, took 26 people hostage, including embassy staff, several visitors, and a police officer who had been guarding the embassy. They demanded the release of prisoners in Khuzestan and their own safe passage out of the United Kingdom. The British government quickly decided that safe passage would not be granted and a siege ensued. Subsequently, police negotiators secured the release of five hostages in exchange for minor concessions, such as the broadcasting of the hostage-takers' demands on British television. By the sixth day of the siege the gunmen were increasingly frustrated at the lack of progress in meeting their demands. That evening, they killed a hostage and threw his body out of the emb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mallet
A mallet is a tool used for imparting force on another object, often made of rubber or sometimes wood, that is smaller than a maul or beetle, and usually has a relatively large head. General overview The term is descriptive of the overall size and proportions of the tool, and not the materials it may be made of, though most mallets have striking faces that are softer than steel. Mallets are used in various industries, such as upholstery work, and a variety of other general purposes. It is a tool of preference for wood workers using chisels with plastic, metal, or wooden handles, as they give a softened strike with a positive drive. * Wooden mallets are usually used in carpentry to knock wooden pieces together, or to drive dowels, chisels and to apply pressure on joints. A wooden mallet will not deform the striking end of a metal tool, as most metal hammers would. It is also used to reduce the force driving the cutting edge of a chisel, giving better control. Hardwo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Farm
A farm (also called an agricultural holding) is an area of land that is devoted primarily to agricultural processes with the primary objective of producing food and other crops; it is the basic facility in food production. The name is used for specialized units such as arable farms, vegetable farms, fruit farms, dairy, pig and poultry farms, and land used for the production of natural fiber, biofuel, and other biobased products. It includes ranches, feedlots, orchards, plantations and estates, smallholdings, and hobby farms, and includes the farmhouse and agricultural buildings as well as the land. In modern times, the term has been extended to include such industrial operations as wind farms and fish farms, both of which can operate on land or at sea. There are about 570 million farms in the world, most of which are small and family-operated. Small farms with a land area of fewer than 2 hectares operate on about 12% of the world's agricultural land, and family farms com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oil Field
A petroleum reservoir or oil and gas reservoir is a subsurface accumulation of hydrocarbons contained in porous or fractured rock formations. Such reservoirs form when kerogen (ancient plant matter) is created in surrounding rock by the presence of high heat and pressure in the Earth's crust. Reservoirs are broadly classified as ''conventional'' and '' unconventional'' reservoirs. In conventional reservoirs, the naturally occurring hydrocarbons, such as crude oil (petroleum) or natural gas, are trapped by overlying rock formations with lower permeability, while in unconventional reservoirs the rocks have high porosity and low permeability, which keeps the hydrocarbons trapped in place, therefore not requiring a cap rock. Reservoirs are found using hydrocarbon exploration methods. Oil field An oil field is an area of accumulated liquid petroleum underground in multiple (potentially linked) reservoirs, trapped as it rises to impermeable rock formations. In industrial ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Special Air Service
The Special Air Service (SAS) is a special forces unit of the British Army. It was founded as a regiment in 1941 by David Stirling, and in 1950 it was reconstituted as a corps. The unit specialises in a number of roles including counter-terrorism, hostage rescue, direct action (military), direct action and special reconnaissance. Much of the information about the SAS is highly classified information, classified, and the unit is not commented on by either the British government or the Ministry of Defence (United Kingdom), Ministry of Defence due to the secrecy and sensitivity of its operations. The corps currently consists of the 22 Special Air Service Regiment, which is the regular component, as well as the Artists Rifles, 21 Special Air Service Regiment (Artists) (Reserve) and the 23 Special Air Service Regiment (Reserve), which are reserve units, all under the operational command of United Kingdom Special Forces (UKSF). Its sister unit is the Royal Navy's Special Boat Servi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hand Tool
A hand tool is any tool that is powered manual labour, by hand rather than a motor. Categories of hand tools include wrenches, pliers, cutter (other), cutters, File (tool), files, hammer, striking tools, chisel, struck or hammered tools, screwdriver, screwdrivers, vises, clamp (tool), clamps, snips, hacksaws, drills, and knives. Outdoor tools such as garden forks, pruning shears, and Rake (tool), rakes are additional forms of hand tools. Portable power tools are not hand tools. History Hand tools have been used by humans since the Stone Age, when stone tools were used for hammering and cutting. During the Bronze Age, tools were made by casting alloys of copper and tin. Bronze tools were sharper and harder than those made of stone. During the Iron Age iron replaced bronze, and tools became even stronger and more durable. The Ancient Rome, Romans developed tools during this period which are similar to those being produced today. After the Industrial Revolution, most tools ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Counter Terrorist
Counterterrorism (alternatively spelled: counter-terrorism), also known as anti-terrorism, relates to the practices, military tactics, techniques, and strategies that governments, law enforcement, businesses, and intelligence agencies use to combat or eliminate terrorism and violent extremism. If an act of terrorism occurs as part of a broader insurgency (and insurgency is included in the definition of terrorism) then counterterrorism may additionally employ counterinsurgency measures. The United States Armed Forces uses the term "foreign internal defense" for programs that support other countries' attempts to suppress insurgency, lawlessness, or subversion, or to reduce the conditions under which threats to national security may develop. History The first counterterrorism body to be formed was the Special Irish Branch of the Metropolitan Police, later renamed the Special Branch after it expanded its scope beyond its original focus on Fenian terrorism. Various law enforcement ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
