The atlatl is a prehistoric weapon that predates the bow and arrow. Essentially, it's a throwing device that employs a spear (also known as a dart) to increase velocity through leverage. Darts may reach speeds of up to 80 mph by flipping them. Currently, only a few states permit the use of atlatls during hunting seasons.
How do you use an atlatl? You grasp it with your hand and swing it like a club in a wide arc. As the point of the atlatl reaches its highest point, you throw it forward with force toward your target. It is important not to release the atlatl until after you have thrown it because if you release the shaft before then, the spear will be lost.
There are several varieties of atlatls found across different parts of the world. Some look like large sticks with a spear attached to their end while others are made of metal or wood with stone or bone points. No matter what type it is, the concept is the same: a heavy object is swung like a club to create more speed. This allows us to kill animals beyond our natural limits.
In North America, atlatls were popular among ancient hunters who wanted to increase the speed and distance of their throws. They were usually made from wood, with some featuring carved bone or horn tips. The more elaborate ones also had rings and other decorations for show-offiness purposes.
A spear-thrower, spear-throwing lever, or atlatl (pronounced/'[email protected]/or/'a: tla: [email protected]/; Nahuatl ahtlatl ['a? tlatl]) is a tool that employs leverage to increase velocity in dart or javelin throwing and incorporates a bearing surface that allows the user to store energy throughout the throw. At its most basic, an atlatl consists of a shaft attached to a ball and socket joint at one end and curved with a lateral groove to hold the point of a dart or spear. As the user swings the atlatl like a club, the ball and socket joint angles back and then forward, storing energy in the arm and shoulder muscles. The moment the dart is released, the user drives the ball down into the ground or water, using momentum and gravity to propel the missile farther than he or she could have without aid of the atlatl.
Atlatls were used by ancient Mexicans and Native Americans. They are still used today by people around the world for sport and entertainment. An atlatl can be as simple as a stick with a rubber ball glued to the end of it or it can be made of metal or hardwood. The more elaborate ones have other elements added to them, such as handles, hooks, and planes where the ball and socket joint meet. Some modern athletes use mechanical devices instead. They usually consist of a cord attached to a spring loaded arm which releases upon contact with the ground or water, propelling the athlete into the air.
Attenuators are electrical components that are designed to lower the amplitude of a signal traveling through them while maintaining the signal's integrity. They are employed in radio frequency (RF) and optical applications. The two main types of attenuators are resistors and inductors.
Atto (symbol a) is a unit prefix in the metric system, denoting a factor of 10-18 or 0.000000000000000001. The unit multiple was adopted at the 12th General Conference on Weights and Measures (CGPM) in Resolution 8. It is derived from the Danish word atten, meaning "eighteen".
In chemistry, an attomole is 1×10−18 mole, or 1/1,000,000,000 molarity. In physics, an attometer is 1×10−18 watt, or 1 joule per second. In particle physics, an attosecond is 1×10−21 second.
In medicine, an attogram is 1×10−15 gram, or 1 nanodot. The human body contains about 1030 cells, or 10 to the 30th power atoms.
|ATL||Atlanta, GA, USA – Hartsfield International (Airport Code)|
|ATL||Active Template Library|
|ATL||Authority to Leave (shipping industry)|
Meanings Contributed by Users According to a proposal from Michigan, the name Attean means "Thank you" and is of Native American origin. Other meanings were suggested by users on the Social Security Administration's Name Finder tool.
|ATW||Around The World|
|ATW||American Theatre Wing|
|ATW||All The Way (82nd Airborne Division motto)|
|ATW||All the Web (web search engine; FAST Search & Transfer ASA)|
The at sign, @, is usually referred to as the at symbol, commercial at, or address sign; it is also known as the at symbol, commercial at, or address sign. It is used in email addresses to separate each component—to identify who is sending which message—and acts as a general indicator of a name followed by an email address.
It is typically used in writing to indicate that there are additional elements following, often including another letter or word. For example, a writer might say "At the end of this sentence, I will include my phone number." Or, "You can find out more about him at www.johndoe.com."
In formal writing, the term for this kind of notation is often hyperlink. In less formal writing, it may be called a label, mark, or signature.