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An air gun (often called pellet gun or BB gun depending on the projectile) is any variety of pneumatic weapon that propels projectiles by means of compressed air or other gas, in contrast to firearms, which use a propellant charge. Both the rifle and pistol forms (air rifle and air pistol) typically propel metallic projectiles, either pellets, or BBs. Certain types of air guns, usually rifles, may also propel arrows or darts with feathers ==History== Air guns represent the oldest pneumatic technology. The oldest existing mechanical air gun, a bellows air gun dating back to about 1580, is in the Livrustkammaren Museum in Stockholm. This is the time most historians recognize as the beginning of the modern air gun. In the 17th century, air guns, in calibers .30–.51, were used to hunt big game deer and wild boar. These air rifles were charged using a pump to fill an air reservoir and gave velocities from . They were also used in warfare; the most recognized example being the Girandoni Military Repeating Air Rifle. At that time, they had compelling advantages over the primitive firearms of the day. For example, air guns could be discharged in wet weather and rain (unlike matchlock muskets), and repeatedly discharged faster than muzzle-loading guns. Moreover, they were quieter than a firearm of similar caliber, had no muzzle flash, and were smokeless. Thus, they did not disclose the shooter's position or obscure the shooter's view, unlike the Black powder muskets of the 18th and 19th centuries. In the hands of skilled soldiers, they gave the military a distinct advantage. France, Austria and other nations had special sniper detachments using air rifles. The Austrian 1770 model was named ''Windbüchse'' (literally "wind rifle" in German). The gun was developed in 1768 or 1769〔Arne Hoff, ''Airguns and Other Pneumatic Arms'', Arms & Armour Series, London, 1972''〕 by the Tyrolean watchmaker, mechanic and gunsmith Bartholomäus Girandoni (1744–1799) and is sometimes referred to as the Girandoni Air Rifle or Girandoni air gun in literature (the name is also spelled "Girandony," "Giradoni"〔L.Wesley, ''Air Guns and Air Pistols'', London 1955〕 or "Girardoni".〔H.L.Blackmore, ''Hunting Weapons'', London 1971〕) The ''Windbüchse'' was about 4 ft (1.2 m) long and weighed 10 pounds (4.5 kg), about the same size and mass as a conventional musket. The air reservoir was a removable, club-shaped, butt. The ''Windbüchse'' carried twenty-two .51 caliber (13 mm) lead balls in a tubular magazine. A skilled shooter could fire off one magazine in about thirty seconds. A shot from this air gun could penetrate an inch thick wooden board at a hundred paces, an effect roughly equal to that of a modern 9×19mm or .45 ACP caliber pistol. Circa 1820, the Japanese inventor Kunitomo Ikkansai developed various manufacturing methods for guns, and also created an air gun based on the study of Western knowledge ("rangaku") acquired from the Dutch in Dejima. The celebrated Lewis and Clark Expedition (1804) carried a reservoir air gun. It held 22 .46 caliber round balls in a tubular magazine mounted on the side of the barrel. The butt served as the air reservoir and had a working pressure of . The rifle was said to be capable of 22 aimed shots per minute and had a rifled bore of and a groove diameter . One of the first commercially successful and mass-produced air guns was manufactured by the W.F. Markham Co. Their first model air gun was called the ''Challenger'' and marketed in 1888. Their next model was the ''Chicago'' followed by the ''King''. The ''Chicago'' model was sold by Sears, Roebuck for 73 cents in its catalog. In 1928 the name of the company was changed to King Mfg. Co. and remained so until the company was purchased by the Daisy air gun company. During the 1890s, air rifles were used in Birmingham, England, for competitive target shooting. Matches were held in public houses, which sponsored shooting teams. Prizes, such as a leg of mutton for the winning team, were paid for by the losing team. The sport became so popular that in 1899, the National Smallbore Rifle Association was created. During this time over 4,000 air rifle clubs and associations existed across Great Britain, many of them in Birmingham. During this time, the air gun was associated with poaching because it could deliver a shot without a significant report. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Air gun」の詳細全文を読む スポンサード リンク
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