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Spear Gun
A speargun is a ranged underwater fishing device designed to launch a tethered spear or harpoon to impale fish or other marine animals and targets. Spearguns are used in sport fishing and underwater target shooting. The two basic types are ''pneumatic'' and ''elastic'' (powered by rubber bands). Spear types come in a number of varieties including threaded, break-away and lined. Floats and buoys are common accessories when targeting larger fish. Components The basic components of a speargun are a spear, a stock or barrel, and a handle or grip containing a trigger mechanism. Spearguns are usually from long, round or roughly rectangular from in diameter/width. Types of spearguns Spearguns are, most often, divided according to propulsion method, with the two common variants being rubber (or band) powered, and air powered (pneumatic). Band-powered spearguns, which are the simplest and cheapest to maintain, with rubber being the predominant material, come in two types: those made ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trigger (firearms)
A trigger is a mechanism that actuates the function of a ranged weapon such as a firearm, airgun, crossbow, or speargun. The word may also be used to describe a switch that initiates the operation of other non-shooting devices such as a trap, a power tool or a quick release. A small amount of energy applied to the trigger leads to the release of much more energy. Most triggers use a small flattened lever (called the ''trigger blade'') depressed by the index finger, but some weapons such as the M2 Browning machine gun or the Iron Horse TOR ("thumb-operated receiver") use a push-button-like thumb-actuated trigger design, and others like the Springfield Armory M6 Scout use a squeeze-bar trigger similar to the "ticklers" on medieval European crossbows. Although the word "trigger" technically implies the entire mechanism (known as the ''trigger group''), colloquially it is usually used to refer specifically to the trigger blade. Most firearm triggers are "single-action", meaning ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Underwater Firearm
An underwater firearm is a firearm designed for use underwater. They are in the arms inventories of many nations. A common feature of underwater firearms or needleguns is that they fire flechettes or spear-like bolts instead of standard bullets. These may be fired by pressurised gas. History Underwater firearms were first developed in the 1960s during the Cold War as a way to arm frogmen. Design Because standard bullet ammunition does not work well underwater, a common feature of underwater firearms is that they fire flechettes instead of standard bullets. The barrels of underwater pistols are typically not rifled. Rather, the fired projectile maintains its ballistic trajectory underwater by hydrodynamic effects. The lack of rifling renders these weapons relatively inaccurate when fired out of water. Underwater rifles are more powerful than underwater pistols and more accurate out of water, but underwater pistols can be manipulated more easily underwater. Among the many ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polespear
A polespear (hand spear or gidgee) is an underwater tool used in spearfishing, consisting of a pole, a spear tip, and a rubber loop. Polespears are often mistakenly called Hawaiian slings, but the tools differ. A Hawaiian sling is akin to a slingshot or an underwater bow and arrow, since the spear and the propelling device are separate, while a polespear has the sling (rubber loop) attached to the spear. Description The pole is usually between four feet and ten feet long and made of fiberglass, carbon fibre, aluminum, graphite, or wood. Longer versions often break down into two or more pieces that screw together. The tip is either threaded to accept different kinds of spear tips or already has a fixed tip attached. The most popular spear tip on polespears are the paralyzer (often called a three-prong), and the Tahitian shaft (a single pivoting barb). Some more serious hunters will equip the polespear with a slip-tip (tip removes from the end and tethers to a fixed point). At the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hawaiian Sling
The Hawaiian sling is a device used in spearfishing. The sling operates much like a bow and arrow does on land, but energy is stored in rubber tubing rather than a wooden or fiberglass bow. Description Mechanically, the device is simple: the only moving parts are the spear shaft and the rubber tubing. A loop of tubing is attached to a block of material, often wood, with a hole drilled in it which is slightly larger in diameter than the shaft. The shaft is placed in the hole, notched in the loop and pulled back, tensioning the tubing. When the shaft is released, the tubing propels it forward, faster and further than a diver could by hand. The Hawaiian sling has some similarities to spearguns and polespears, in that all are powered by energy stored in rubber tubing. However, it occupies a middle ground between the two; the sling is somewhat more powerful than a polespear and offers a much more comfortable grip, but is less powerful than most spear guns. Like a pole spear, the diver ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scuba Diving
Scuba diving is a mode of underwater diving whereby divers use breathing equipment that is completely independent of a surface air supply. The name "scuba", an acronym for "Self-Contained Underwater Breathing Apparatus", was coined by Christian J. Lambertsen in a patent submitted in 1952. Scuba divers carry their own source of breathing gas, usually compressed air, affording them greater independence and movement than surface-supplied divers, and more time underwater than free divers. Although the use of compressed air is common, a gas blend with a higher oxygen content, known as enriched air or nitrox, has become popular due to the reduced nitrogen intake during long and/or repetitive dives. Also, breathing gas diluted with helium may be used to reduce the likelihood and effects of nitrogen narcosis during deeper dives. Open circuit scuba systems discharge the breathing gas into the environment as it is exhaled, and consist of one or more diving cylinders containing breat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bungee Jumping
Bungee jumping (), also spelled bungy jumping, is an activity that involves a person jumping from a great height while connected to a large elastic cord. The launching pad is usually erected on a tall structure such as a building or crane, a bridge across a deep ravine, or on a natural geographic feature such as a cliff. It is also possible to jump from a type of aircraft that has the ability to hover above the ground, such as a hot-air-balloon or helicopter. The thrill comes from the free-falling and the rebound. When the person jumps, the cord stretches and the jumper flies upwards again as the cord recoils, and continues to oscillate up and down until all the kinetic energy is dissipated. Early tethered jumping The land diving ( Sa: ') of Pentecost Island in Vanuatu is an ancient ritual in which young men jump from tall wooden platforms with vines tied to their ankles as a test of their courage and passage into manhood. Unlike in modern bungee-jumping, land-divers in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sharpe Family Murders
The Sharpe family murders refer to an Australian 2004 double murder. Australian man John Myles Sharpe killed his pregnant wife, New Zealander Anna Marie Kemp, and their 20-month-old daughter, Gracie Louise Kemp, in the semi-rural Melbourne suburb of Mornington, Victoria, in March 2004. Authorities say Sharpe repeatedly fired a speargun into the heads of his victims, later exhumed the body of his wife from a shallow grave, dismembered her, then disposed of her body in a landfill. Sharpe later appeared in emotional interviews on television seeking information on his family's whereabouts. He eventually confessed to the murders and was sentenced in 2005 to two consecutive terms of life imprisonment, with a non-parole period of thirty-three years. He will be eligible for parole in 2037. Background John Sharpe was born 28 February 1967 in Mornington, Victoria, where he also grew up. He met his New Zealand-born wife, Anna Kemp, when they worked together at the Commonwealth Bank of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Federal Express Flight 705
On April 7, 1994, Federal Express Flight 705, a McDonnell Douglas DC-10-30 cargo jet carrying electronics equipment across the United States from Memphis, Tennessee, to San Jose, California, was involved in a hijack attempt by Auburn R. Calloway, who the prosecution argued was trying to commit suicide. Calloway, a Federal Express employee, was facing possible dismissal for lying about his flight hours. He boarded the scheduled flight as a deadhead passenger carrying a guitar case concealing several hammers and a speargun. He tried to switch off the aircraft's cockpit voice recorder (CVR) before takeoff and, once airborne, kill the crew with hammers so their injuries would appear consistent with an accident rather than a hijacking. The CVR, though, was switched back on by the flight engineer, believing that he had neglected to turn it on. Calloway intended to use the speargun as a last resort. He planned to crash the aircraft hoping that he would appear to be an employee killed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fishing License
A fishing license ( US), fishing licence ( UK), or fishing permit is an administrative or legal mechanism employed by local governments to regulate fishing. Licensing is one mechanism of fisheries management commonly used in Western countries, and may be required for either commercial or recreational fishing. Historical licensing In 1765, the Chinese Qing dynasty government required all fishing boat operators to obtain a fishing license under the ''aojia'' system that regulated coastal populations. The Dan boat people of Guangdong had to acquire a fishing license as early as 1729. The wooden license issued by the government was to be displayed on the bow or stern of a boat. The information on the license consisted of the name and age of the boat's owner, the ship's status as either a fishing or commercial vessel, the home port of the boat, crew and family members on board, the date the license was issued, and the registration number of the license. Types by country Depending ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archery
Archery is the sport, practice, or skill of using a bow to shoot arrows.Paterson ''Encyclopaedia of Archery'' p. 17 The word comes from the Latin ''arcus'', meaning bow. Historically, archery has been used for hunting and combat. In modern times, it is mainly a competitive sport and recreational activity. A person who practices archery is typically called an archer, bowman, or toxophilite. History Origins and ancient archery The oldest known evidence of the bow and arrow comes from South African sites such as Sibudu Cave, where the remains of bone and stone arrowheads have been found dating approximately 72,000 to 60,000 years ago.Backwell L, d'Errico F, Wadley L.(2008). Middle Stone Age bone tools from the Howiesons Poort layers, Sibudu Cave, South Africa. Journal of Archaeological Science, 35:1566–1580. Backwell L, Bradfield J, Carlson KJ, Jashashvili T, Wadley L, d'Errico F.(2018). The antiquity of bow-and-arrow technology: evidence from Middle Stone Age layers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Overview Of Gun Laws By Nation
Gun laws and policies, collectively referred to as firearms regulation or gun control, regulate the manufacture, sale, transfer, possession, modification, and use of small arms by civilians. Laws of some countries may afford civilians a right to keep and bear arms, and have more liberal gun laws than neighboring jurisdictions. Countries that regulate access to firearms will typically restrict access to certain categories of firearms and then restrict the categories of persons who may be granted a license for access to such firearms. There may be separate licenses for hunting, sport shooting ( target shooting), self-defense, collecting, and concealed carry, with different sets of requirements, permissions, and responsibilities. Gun laws are often enacted with the intention of reducing the use of small arms in criminal activity, specifying weapons perceived as being capable of inflicting the greatest damage and those most easily concealed, such as handguns and other short-barrel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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