1.
Medium machine gun
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A medium machine gun, in modern terms, usually refers to a belt-fed automatic firearm firing a full-power rifle cartridge. In the late 19th century, Gatling guns and other externally powered types, such as the Nordenfelt, were made in different ranges of calibers. Thanks to their barrels, overheating was not a major issue. When Hiram Maxim developed his recoil-powered machine gun used a single barrel. As depicted in a photo of Maxim, it could be picked up complete with its 15-pound tripod with one arm. It was similar to later-design medium machine guns, but it could not be fired for extended periods, as a result, he created a water-jacket cooling system to enable it to fire for extended periods. This added significant weight, as did changes to more powerful cartridges and this class of heavy, water-cooled machine gun would eventually be regarded as the classic heavy machine guns. Many new designs were developed, some powered by air or recoil, also, instead of the rather heavy water jacket, new designs introduced other types of cooling, such as barrel replacement, metal fins, and/or heat sinks or some combination of all of them. Machine guns then diverged into heavier and lighter designs, the later model water-cooled Maxim gun and its derivatives, were all substantial weapons. The.303 inch Vickers, for example, weighed 33 lb alone, the heavier designs could, and in some cases did, literally fire for days on end. The need was to be able to cut down, potentially, the heavy machine gun was mounted on a tripod and was often water-cooled, a well-trained and well-supplied crew could fire for hours on end. Carefully positioned heavy machine guns could stop a force before they reached their objectives. The first machine guns in use before World War I covered a range of characteristics. In addition to these designs, there were also a number of lighter types. During the same period, a number of new air-cooled designs were developed that, instead of weighing well over 30 lb, were lighter and more mobile. In World War I, they were to be as important as the designs, and were used to support squads and infantry on the move, on aircraft. The two that would become critical were new medium and light machine guns, the new medium machine guns offered less, or more difficult-to-use, cooling than the heavier designs, but more than the lightest. Light machine guns were introduced as lighter, more portable automatic weapons and they still fired the same full-power rifle caliber ammunition, but used lighter barrels without extra cooling and were fired from a bipod
2.
Czechoslovakia
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From 1939 to 1945, following its forced division and partial incorporation into Nazi Germany, the state did not de facto exist but its government-in-exile continued to operate. From 1948 to 1990, Czechoslovakia was part of the Soviet bloc with a command economy and its economic status was formalized in membership of Comecon from 1949, and its defense status in the Warsaw Pact of May 1955. A period of liberalization in 1968, known as the Prague Spring, was forcibly ended when the Soviet Union, assisted by several other Warsaw Pact countries. In 1993, Czechoslovakia split into the two states of the Czech Republic and Slovakia. Form of state 1918–1938, A democratic republic, 1938–1939, After annexation of Sudetenland by Nazi Germany in 1938, the region gradually turned into a state with loosened connections among the Czech, Slovak, and Ruthenian parts. A large strip of southern Slovakia and Carpatho-Ukraine was annexed by Hungary, 1939–1945, The region was split into the Protectorate of Bohemia and Moravia and the Slovak Republic. A government-in-exile continued to exist in London, supported by the United Kingdom, United States and its Allies, after the German invasion of Russia, Czechoslovakia adhered to the Declaration by United Nations and was a founding member of the United Nations. 1946–1948, The country was governed by a government with communist ministers, including the prime minister. Carpathian Ruthenia was ceded to the Soviet Union, 1948–1989, The country became a socialist state under Soviet domination with a centrally planned economy. In 1960, the country became a socialist republic, the Czechoslovak Socialist Republic. It was a state of the Soviet Union. 1989–1990, The federal republic consisted of the Czech Socialist Republic, 1990–1992, Following the Velvet Revolution, the state was renamed the Czech and Slovak Federal Republic, consisting of the Czech Republic and the Slovak Republic. Neighbours Austria 1918–1938, 1945–1992 Germany Hungary Poland Romania 1918–1938 Soviet Union 1945–1991 Ukraine 1991–1992 Topography The country was of irregular terrain. The western area was part of the north-central European uplands, the eastern region was composed of the northern reaches of the Carpathian Mountains and lands of the Danube River basin. Climate The weather is mild winters and mild summers, influenced by the Atlantic Ocean from the west, Baltic Sea from the north, and Mediterranean Sea from the south. The area was long a part of the Austro Hungarian Empire until the Empire collapsed at the end of World War I, the new state was founded by Tomáš Garrigue Masaryk, who served as its first president from 14 November 1918 to 14 December 1935. He was succeeded by his ally, Edvard Beneš. The roots of Czech nationalism go back to the 19th century, nationalism became a mass movement in the last half of the 19th century
3.
World War II
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World War II, also known as the Second World War, was a global war that lasted from 1939 to 1945, although related conflicts began earlier. It involved the vast majority of the worlds countries—including all of the great powers—eventually forming two opposing alliances, the Allies and the Axis. It was the most widespread war in history, and directly involved more than 100 million people from over 30 countries. Marked by mass deaths of civilians, including the Holocaust and the bombing of industrial and population centres. These made World War II the deadliest conflict in human history, from late 1939 to early 1941, in a series of campaigns and treaties, Germany conquered or controlled much of continental Europe, and formed the Axis alliance with Italy and Japan. Under the Molotov–Ribbentrop Pact of August 1939, Germany and the Soviet Union partitioned and annexed territories of their European neighbours, Poland, Finland, Romania and the Baltic states. In December 1941, Japan attacked the United States and European colonies in the Pacific Ocean, and quickly conquered much of the Western Pacific. The Axis advance halted in 1942 when Japan lost the critical Battle of Midway, near Hawaii, in 1944, the Western Allies invaded German-occupied France, while the Soviet Union regained all of its territorial losses and invaded Germany and its allies. During 1944 and 1945 the Japanese suffered major reverses in mainland Asia in South Central China and Burma, while the Allies crippled the Japanese Navy, thus ended the war in Asia, cementing the total victory of the Allies. World War II altered the political alignment and social structure of the world, the United Nations was established to foster international co-operation and prevent future conflicts. The victorious great powers—the United States, the Soviet Union, China, the United Kingdom, the Soviet Union and the United States emerged as rival superpowers, setting the stage for the Cold War, which lasted for the next 46 years. Meanwhile, the influence of European great powers waned, while the decolonisation of Asia, most countries whose industries had been damaged moved towards economic recovery. Political integration, especially in Europe, emerged as an effort to end pre-war enmities, the start of the war in Europe is generally held to be 1 September 1939, beginning with the German invasion of Poland, Britain and France declared war on Germany two days later. The dates for the beginning of war in the Pacific include the start of the Second Sino-Japanese War on 7 July 1937, or even the Japanese invasion of Manchuria on 19 September 1931. Others follow the British historian A. J. P. Taylor, who held that the Sino-Japanese War and war in Europe and its colonies occurred simultaneously and this article uses the conventional dating. Other starting dates sometimes used for World War II include the Italian invasion of Abyssinia on 3 October 1935. The British historian Antony Beevor views the beginning of World War II as the Battles of Khalkhin Gol fought between Japan and the forces of Mongolia and the Soviet Union from May to September 1939, the exact date of the wars end is also not universally agreed upon. It was generally accepted at the time that the war ended with the armistice of 14 August 1945, rather than the formal surrender of Japan
4.
Birmingham Small Arms Company
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This article is not about Gamo subsidiary BSA Guns Limited or BSA Company or its successors. At its peak, BSA was the largest motorcycle producer in the world, in the late 1950s and early 1960s poor management and failure to develop new products in the motorcycle division led to a dramatic decline of sales to its major USA market. The management had failed to appreciate the importance of the resurgent Japanese motorcycle industry, the original company, The Birmingham Small Arms Company Limited, remains a subsidiary of Manganese Bronze but its name was changed in 1987. BSA began in June 1861 in the Gun Quarter, Birmingham, England and it was formed by a group of fourteen gunsmith members of the Birmingham Small Arms Trade Association. The War Office provided this new grouping of gunsmiths free access to technical drawings, the newly formed company purchased 25 acres of land at Small Heath, Birmingham, built a factory there and made a road on the site calling it Armoury Road. This machinery brought to Birmingham manifested the principle of the inter-changeability of parts, BSAs resort to the use of machinery was rewarded in 1863 with an order for 20,000 Turkish infantry rifles. F. Swinburn under the chairmanship of John Dent Goodman, the first War Office contract was not agreed until 1868. In 1879, the factory, without work, was shut for a year, the military arms trade was precarious. The next year BSA branched out into bicycle manufacture, the gun factory proved remarkably adaptable to the manufacture of cycle parts. What cycles needed was large quantities of standard parts accurately machined at low prices, bicycle production ceased in 1887 as the company concentrated on producing the Lee–Metford magazine-loading rifle for the War Office which was re-equipping the British Army with it. The order was for 1,200 rifles per week, BSA recommenced manufacturing bicycles on their own behalf from 1908. BSA Cycles Ltd was set up in 1919 for the manufacture of bicycles and motorcycles. BSA sold the business to Raleigh in 1957 after separating the bicycle and motorcycle business in 1953. In 1893, BSA commenced making bicycle hubs and continued to supply the cycle trade with bicycle parts up to 1936, BSA bought The Eadie Manufacturing Company of Redditch in 1907 and so began to manufacture the Eadie two speed hub gear and the Eadie coaster brake hub. BSA also signed an agreement with the Three Speed Gear Syndicate in 1907 to manufacture a 3 speed hub under licence. This was later classified as the Sturmey Archer Type X. BSA introduced a Duo hub in the late 1930s which was capable of one fixed gear, all BSA hub gear production temporarily ceased in 1939, until they recommenced making their 3 speed hub around 1945. The Eadie coaster hub made a return in 1953 on two BSA bicycle models. BSA forever ceased production of their hub gears in 1955, BSA sold its ammunition business in 1897 to Birmingham Metal and Munitions Company Limited part of the Nobel-Dynamite Trust, through Kynoch a forerunner of ICI
5.
Gun barrel
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A gun barrel is a part of firearms and artillery pieces. The hollow interior of the barrel is called the bore, a gun barrel must be able to hold in the expanding gas produced by the propellants to ensure that optimum muzzle velocity is attained by the projectile as it is being pushed out by the expanding gas. Modern small arms barrels are made of known and tested to withstand the pressures involved. Artillery pieces are made by various techniques providing reliably sufficient strength, early firearms were muzzle-loading, with powder, and then shot loaded from the muzzle, capable of only a low rate of fire. During the 19th century effective mechanical locks were invented that sealed a breech-loading weapon against the escape of propellant gases, the early Chinese, the inventors of gunpowder, used bamboo, a naturally tubular stalk, as the first barrels in gunpowder projectile weapons. Early European guns were made of iron, usually with several strengthening bands of the metal wrapped around circular wrought iron rings. The Chinese were the first to master cast-iron cannon barrels, early cannon barrels were very thick for their caliber. Bore evacuator Bore snake Cannon Muzzle Polygonal rifling Rifling Slug barrel Smoothbore
6.
Cartridge (firearms)
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Military and commercial producers continue to pursue the goal of caseless ammunition. A cartridge without a bullet is called a blank, One that is completely inert is called a dummy. Some artillery ammunition uses the same concept as found in small arms. In other cases, the shell is separate from the propellant charge. In popular use, the bullet is often misused to refer to a complete cartridge. The cartridge case seals a firing chamber in all directions excepting the bore, a firing pin strikes the primer and ignites it. The primer compound deflagrates, it does not detonate, a jet of burning gas from the primer ignites the propellant. Gases from the burning powder pressurize and expand the case to seal it against the chamber wall and these propellant gases push on the bullet base. In response to pressure, the bullet will move in the path of least resistance which is down the bore of the barrel. After the bullet leaves the barrel, the pressure drops to atmospheric pressure. The case, which had been expanded by chamber pressure. This eases removal of the case from the chamber, brass is a commonly used case material because it is resistant to corrosion. A brass case head can be work-hardened to withstand the pressures of cartridges. The neck and body portion of a case is easily annealed to make the case ductile enough to allow reforming so that it can be reloaded many times. Steel is used in some plinking ammunition, as well as in military ammunition. Steel is less expensive than brass, but it is not feasible to reload, Military forces typically consider small arms cartridge cases to be disposable, one-time-use devices. However, case weight affects how much ammunition a soldier can carry, conversely, steel is more susceptible to contamination and damage so all such cases are varnished or otherwise sealed against the elements. One downside caused by the strength of steel in the neck of these cases is that propellant gas can blow back past the neck
7.
Caliber
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In guns, particularly firearms, caliber or calibre is the approximate internal diameter of the barrel, or the diameter of the projectile it fires, in hundredths or sometimes thousandths of an inch. For example, a 45 caliber firearm has a diameter of.45 of an inch. Barrel diameters can also be expressed using metric dimensions, as in 9mm pistol, when the barrel diameter is given in inches, the abbreviation cal can be used. Good performance requires a bullet to closely match the diameter of a barrel to ensure a good seal. While modern cartridges and cartridge firearms are referred to by the cartridge name. Firearm calibers outside the range of 17 to 50 exist, but are rarely encountered. Larger calibers, such as.577.585.600.700, the.950 JDJ is the only known cartridge beyond 79 caliber used in a rifle. Referring to artillery, caliber is used to describe the length as multiples of the bore diameter. A 5-inch 50 calibre gun has a diameter of 5 in. The main guns of the USS Missouri are 1650 caliber, makers of early cartridge arms had to invent methods of naming the cartridges, since no established convention existed then. One of the early established cartridge arms was the Spencer repeating rifle, later various derivatives were created using the same basic cartridge, but with smaller-diameter bullets, these were named by the cartridge diameter at the base and mouth. The original No.56 became the. 56-56, and the smaller versions. 56-52. 56-50, the. 56-52, the most common of the new calibers, used a 50-cal bullet. Optionally, the weight in grains was designated, e. g. 45-70-405. Variations on these methods persist today, with new cartridges such as the.204 Ruger, metric diameters for small arms refer to cartridge dimensions and are expressed with an × between the bore diameter and the length of the cartridge case, for example,7. 62×51 NATO. This indicates that the diameter is 7. 62mm, loaded in a case 51mm long. Similarly, the 6. 5×55 Swedish cartridge has a diameter of 6.5 mm. An exception to rule is the proprietary cartridge used by U. S. maker Lazzeroni. The following table lists commonly used calibers where both metric and imperial are used as equivalents
