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Atlatl
A spear-thrower, spear-throwing lever, or ''atlatl'' (pronounced or ; Classical Nahuatl, Nahuatl ''ahtlatl'' ) is a tool that uses leverage to achieve greater velocity in Dart (missile), dart or javelin-throwing, and includes a Plain bearing, bearing surface that allows the user to store energy during the throw. It may consist of a shaft with a cup or a spur at the end that supports and propels the butt of the spear. It's usually about as long as the user's arm or forearm. The user holds the spear-thrower in one hand, gripping near the end farthest from the cup. The user puts the butt end of the spear, or dart, in the cup, or grabs the spur with the end of the spear. The spear is much longer than the thrower. The user holds the thrower at the grip end, with the spear resting on the thrower and the butt end of the spear resting in the thrower's cup. The user can hold the spear, with the index and thumb, with the same hand as the thrower, with the other fingers. The user reaches b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Swiss Arrow
A Swiss arrow (also known as a Yorkshire arrow, Dutch arrow, Scotch arrow, or Gypsy arrow) is a type of enlarged dart in the shape of an arrow that is thrown with the aid of a lanyard, which is retained by a small notch close to the fletching. It is very similar to an amentum and uses the same throwing principle as a spear-thrower. Design The arrow shaft is made from wood. A slit is cut at one end to take a pair of card flights, and the other end is given a point. An all-important notch or shallow groove is cut into or around the shaft, just below the flights. After the flights are inserted, the open end of the slit is closed with string or a rubber band to prevent the flights from falling out. Use To launch the arrow, the thrower uses a length of string that is longer than the length of the arrow itself. A knot is tied in one end of the string, and this is placed into the notch or groove in the arrow shaft. The rest of the string is then passed around the shaft once, and is ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dart (missile)
Darts are airborne ranged weapons. They are designed to fly such that a sharp, often weighted point will strike first. They can be distinguished from javelins by the presence of fletching (feathers on the tail) and a shaft that is shorter or more flexible. Darts can be propelled by hand or with the aid of a hand-held implement such as a blowgun. They can be distinguished from arrows because they are not used with a Bow and arrow, bow. Darts have been used since pre-history. The plumbatae were lead-weighted darts thrown by infantrymen in Antiquity and the Middle Ages. Darts can be propelled by a number of means. The atlatl uses leverage to increase the velocity of the dart, the kestros (weapon), kestros increases the range of propelled darts using a sling, and the exhalation of a person's breath through a blowgun propels small stone points or poisoned needles with pneumatic force. In the modern era, darts have been used for recreation in lawn darts and the game of darts. Histo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Javelin
A javelin is a light spear designed primarily to be thrown, historically as a ranged weapon. Today, the javelin is predominantly used for sporting purposes such as the javelin throw. The javelin is nearly always thrown by hand, unlike the sling (weapon), sling, bow and arrow, bow, and crossbow, which launch projectiles with the aid of a hand-held mechanism. However, devices do exist to assist the javelin thrower in achieving greater distances, such as spear-throwers or the amentum. A warrior or soldier armed primarily with one or more javelins is a javelineer. The word javelin comes from Middle English and it derives from Old French ''javelin'', a diminutive of ''javelot'', which meant spear. The word ''javelot'' probably originated from one of the Celtic languages. Prehistory There is archaeological evidence that javelins and throwing sticks were already in use by the last phase of the Lower Paleolithic. Seven spear-like objects were found in a coal mine in the city of Schön ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silver Atlatl Spear Thrower MET VS1987 394 244
Silver is a chemical element; it has symbol Ag () and atomic number 47. A soft, whitish-gray, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. Silver is found in the Earth's crust in the pure, free elemental form ("native silver"), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. Most silver is produced as a byproduct of copper, gold, lead, and zinc refining. Silver has long been valued as a precious metal. Silver metal is used in many bullion coins, sometimes alongside gold: while it is more abundant than gold, it is much less abundant as a native metal. Its purity is typically measured on a per-mille basis; a 94%-pure alloy is described as "0.940 fine". As one of the seven metals of antiquity, silver has had an enduring role in most human cultures. Other than in currency and as an investment medium (coins and bullion), silver is used in solar panels, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bannerstone
Bannerstones are artifacts usually found in the Eastern United States that are characterized by a centered hole in a symmetrically shaped carved or ground stone. The holes are typically " to " in diameter and extend through a raised portion centered in the stone. They usually are bored all the way through but some have been found with holes that extend only part of the way through. Many are made from banded slate or other colored hard stone. They often have a geometric "wing nut" or "butterfly" shape but are not limited to these. More than just functional artifacts, bannerstones are a form of art that appear in varying shapes, designs, and colors, symbolizing their ceremonial and spiritual importance. Debates over function Archaeologists have debated over the use of bannerstones. Some have suggested that they are atlatl weights or ceremonial pieces. ''In situ'' evidence of bannerstones found in line with atlatl handles and hooks in graves found in Kentucky led to William Webb to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Momentum
In Newtonian mechanics, momentum (: momenta or momentums; more specifically linear momentum or translational momentum) is the product of the mass and velocity of an object. It is a vector quantity, possessing a magnitude and a direction. If is an object's mass and is its velocity (also a vector quantity), then the object's momentum (from Latin '' pellere'' "push, drive") is: \mathbf = m \mathbf. In the International System of Units (SI), the unit of measurement of momentum is the kilogram metre per second (kg⋅m/s), which is dimensionally equivalent to the newton-second. Newton's second law of motion states that the rate of change of a body's momentum is equal to the net force acting on it. Momentum depends on the frame of reference, but in any inertial frame of reference, it is a ''conserved'' quantity, meaning that if a closed system is not affected by external forces, its total momentum does not change. Momentum is also conserved in special relativity (with a mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
357 Magnum
The .357 Smith & Wesson Magnum, .357 S&W Magnum, .357 Magnum, or 9×33mmR (as it is known in unofficial metric designation) is a smokeless powder cartridge with a bullet diameter. It was created by Elmer Keith, Phillip B. Sharpe, and Douglas B. Wesson of firearm manufacturers Smith & Wesson and Winchester. The .357 Magnum cartridge is notable for its highly effective terminal ballistics. The .357 Magnum cartridge is based upon Smith & Wesson's earlier .38 Special cartridge. It was introduced in 1935, and its use has since become widespread. Design The .357 Magnum was collaboratively developed over a period in the early to mid-1930s by a group of individuals as a direct response to Colt's .38 Super Automatic. At the time, the .38 Super was the only American pistol cartridge capable of defeating automobile cover and the early ballistic vests that were just beginning to emerge in the Interwar period. Tests at the time revealed that those vests defeated any handgun bullet trav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bannerstone
Bannerstones are artifacts usually found in the Eastern United States that are characterized by a centered hole in a symmetrically shaped carved or ground stone. The holes are typically " to " in diameter and extend through a raised portion centered in the stone. They usually are bored all the way through but some have been found with holes that extend only part of the way through. Many are made from banded slate or other colored hard stone. They often have a geometric "wing nut" or "butterfly" shape but are not limited to these. More than just functional artifacts, bannerstones are a form of art that appear in varying shapes, designs, and colors, symbolizing their ceremonial and spiritual importance. Debates over function Archaeologists have debated over the use of bannerstones. Some have suggested that they are atlatl weights or ceremonial pieces. ''In situ'' evidence of bannerstones found in line with atlatl handles and hooks in graves found in Kentucky led to William Webb to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spindle (textiles)
A spindle is a straight spike, usually made from wood, used for spinning, twisting fibers such as wool, flax, hemp, and cotton into yarn. It is often weighted at either the bottom, middle, or top, commonly by a disc or spherical object called a whorl; many spindles, however, are weighted simply by thickening their shape towards the bottom, e.g. Orenburg and French spindles. The spindle may also have a hook, groove, or notch at the top to guide the yarn. Spindles come in many different sizes and weights depending on the thickness of the yarn one desires to spin. History The origin of the first wooden spindle is lost to history because the materials did not survive. Whorl-weighted spindles date back at least to Neolithic times; spindle whorls have been found in archaeological digs around the world. Possible remains of spindle whorls were found in a Natufian village at Nahal Ein Gev II archeological site, Israel, from 12000 years ago. A spindle is also part of traditional ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wingnut (hardware)
A wingnut, wing nut or butterfly nut is a type of nut with two large metal "wings", one on each side, so it can be easily tightened and loosened by hand without tools. A similar fastener with a male thread is known as a wing screw or a wing bolt. Types ASME B18.6.9 classifies wing nuts first by manufacturing method and then by style. * Type A are cold forged or cold formed produced in regular, light and heavy dimensional series. * Type B are hot forged solid nuts available in three different wing styles. * Type C are die cast nuts available in three wing styles with variances between regular and heavy dimensional series * Type D are stamped sheet metal nuts available in three wing styles. Usage Bicycles Before the development of quick release skewers, bicycle wheels were held in place with wingnuts. Drum hardware In a drum kit wingnuts and wingbolts are used extensively. * For securing a suspended cymbal on the mounting bolt of a cymbal stand. * For securing an adjustm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Self Bow
A self bow or simple bow is a bow made from a single piece of wood. Extra material such as horn nocks on the ends, or built-up handles, would normally be accepted as part of a self bow. Some modern authorities would also accept a bow spliced together in the handle from two pieces of wood. Comparison with composite bows An effective self bow can be made from widely available local material in most inhabited parts of the world, with limited tools whose functions include chopping, shaving, and scraping. A day of work may be needed, starting with a seasoned stave; a composite bow requires a week's work, and could possibly take up to several years, starting with a much greater range of materials and skills.. Self bows must be approximately the height of the archer if they are to allow a long draw, and they are less efficient in the specialized art of flight archery. Well-designed composite bows of high draw-weight give higher arrow velocity, and the bow itself is shorter. However ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
