1.
Upshot-Knothole Grable
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Upshot–Knothole Grable was a nuclear weapons test conducted by the United States as part of Operation Upshot–Knothole. Detonation of the nuclear weapon occurred 19 seconds after its deployment at 8, 30am PDT on May 25,1953. The codename Grable was chosen because the letter Grable is phonetic for G, as in gun, as a shell, or artillery-fired atomic projectile, the device was the first of its kind. The test remains the only nuclear artillery shell ever fired in the U. S. nuclear weapons test program. Grable was the second of only four gun-type warheads ever detonated, the shell, designated a Mark 9 nuclear weapon, had a diameter of 280 mm, was 1380 mm long and weighed 364 kg. The M65 Atomic Cannon from which it was fired had a velocity of 625 m/s, for a nominal range of 32 km. The detonation of Grable occurred 19 seconds after its firing and it detonated over 11,000 yards away from the gun it was fired from, over a part of the Nevada Test Site known as Frenchman Flat. The explosion was an air burst of 160 m above the ground,26 m west and 41 m south of its target and its yield was estimated at 15 kilotons, around the same level as Little Boy. An anomalous feature of the blast was the formation of a precursor and this precursor was formed when the shock wave reflected off the ground and surpassed the incident wave and Mach stem due to a heated ground air layer and the low burst height. It resulted in a lower overpressure, but higher overall dynamic pressure and this led strategists to rethink the importance of low air bursts in tactical nuclear warfare. Some images from Upshot–Knothole Grable were accidentally relabeled as belonging to the Priscilla shot from Operation Plumbbob in 1957, as a consequence many publications including official government documents have the photo mislabeled. Admiral Arthur W. Radford, at the time the Chairman of the Joint Chiefs of Staff, video clip of Grable nuclear artillery experiment The Atomic Cannon from AtomCentral. com, including video
2.
Nevada Test Site
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Nuclear testing at the Nevada Test Site began with a 1-kiloton-of-TNT bomb dropped on Frenchman Flat on 27 January 1951. Many of the images of the nuclear era come from the NTS. During the 1950s, the clouds from the 100 atmospheric tests could be seen for almost 100 mi. The city of Las Vegas experienced noticeable seismic effects, and the distant mushroom clouds, St. George, Utah, received the brunt of the fallout of above-ground nuclear testing in the Yucca Flats/Nevada Test Site. Winds routinely carried the fallout of these tests directly through St. George, the vast majority—828 of the 928 total nuclear tests—were underground. Those arrested included the astronomer Carl Sagan and the actors Kris Kristofferson, Martin Sheen, the Nevada Test Site contains 28 areas,1,100 buildings,400 miles of paved roads,300 miles of unpaved roads, ten heliports, and two airstrips. The Nevada Test Site was established as a 680-square-mile area by President Harry Truman on December 18,1950, within the Nellis Air Force Gunnery, the Nevada Test Site was the primary testing location of American nuclear devices from 1951 to 1992,928 announced nuclear tests occurred there. The site is covered with subsidence craters from the testing, the NTS was the United States primary location for tests in the 500-to-1,000 kt range. 126 tests were conducted elsewhere, including most larger tests, many of these occurred at the Pacific Proving Grounds in the Marshall Islands. During the 1950s, the clouds from atmospheric tests could be seen for almost 100 mi. The city of Las Vegas experienced noticeable seismic effects, and the distant mushroom clouds, the last atmospheric test detonation at the Nevada Test Site was Little Feller I of Operation Sunbeam, on 17 July 1962. Although the United States did not ratify the Comprehensive Test Ban Treaty, it honors the articles of the treaty, subcritical tests not involving a critical mass continue. It created a crater 1,280 feet wide and 320 feet deep that can still be seen today, the site was scheduled to be used to conduct the testing of a 1, 100-ton conventional explosive in an operation known as Divine Strake in June 2006. The bomb is an alternative to nuclear bunker busters. After objections from Nevada and Utahs members of Congress, the operation was postponed until 2007, on 22 February 2007, the Defense Threat Reduction Agency officially canceled the experiment. On December 7,2012 the most-recent explosion was conducted, an underground sub-critical test of the properties of plutonium, NTS also performed piggyback testing of effects of nuclear detonation during the above-ground tests. Vehicles, shelters, utility stations, and other structures were placed at distances from the Ground Zero detonation point of each weapon. Homes and commercial buildings were built to typical of American and European cities
3.
Nuclear weapon yield
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An explosive yield of one terajoule is 0.239 kt of TNT. The yield-to-weight ratio is the amount of weapon yield compared to the mass of the weapon, the practical maximum yield-to-weight ratio for fusion weapons has been estimated to six megatons of TNT per metric ton of bomb mass. Yields of 5.2 megatons/ton and higher have been reported for large weapons constructed for use in the early 1960s. Most artificial non-nuclear explosions are considerably smaller than even what are considered to be very small nuclear weapons, the yield-to-weight ratio is the amount of weapon yield compared to the mass of the weapon. According to nuclear-weapons designer Ted Taylor, the practical maximum yield-to-weight ratio for fusion weapons is about 6 megatons of TNT per metric ton. The Taylor limit is not derived from first principles, and weapons with yields as high as 9.5 megatons per metric ton have been designed and built. The 25 Mt yield option reported for the B41 would give it a ratio of 5.1 megatons of TNT per metric ton. This results in the B41 still retaining the record for the highest Yield-to-weight weapon ever designed, in 1963 DOE declassified statements that the U. S. had the technological capability of deploying a 35 Mt warhead on the Titan II, or a 50-60 Mt gravity bomb on B-52s. Neither weapon was pursued, but either would require yield-to-weight ratios superior to a 25 Mt Mk-41, for current smaller US weapons, yield is 600 to 2200 kilotons of TNT per metric ton. By comparison, for the very small devices such as the Davy Crockett it was 0.4 to 40 kilotons of TNT per metric ton. For historical comparison, for Little Boy the yield was only 4 kilotons of TNT per metric ton, and for the largest Tsar Bomba, the yield was 2 megatons of TNT per metric ton. The largest pure-fission bomb ever constructed Ivy King had a 500 kiloton yield, however, there is no known upper yield limit for a fusion bomb. For example, the Mk-36 bomb as built had a ratio of 1.25 megatons of TNT per metric ton. Delivery size limits can be estimated to ascertain limits to delivery of high yield weapons. If the full 250 metric ton payload of the Antonov An-225 aircraft could be used, likewise, the maximum limit of a missile-delivered weapon is determined by the missile gross payload capacity. The large Russian SS-18 ICBM has a capacity of 7,200 kg. A Saturn V-scale missile could deliver over 120 tons, giving a maximum yield of about 700 megatons. The following list is of nuclear explosions
4.
Tactical nuclear weapon
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Tactical nuclear weapons were a large part of the peak nuclear weapons stockpile levels during the Cold War. Tactical nuclear weapons include gravity bombs, short-range missiles, artillery shells, land mines, depth charges, also in this category are nuclear armed ground-based or shipborne surface-to-air missiles and air-to-air missiles. In wartime, such explosives could be used for demolishing choke-points to enemy offensives, such as at tunnels, narrow mountain passes, there is no precise definition of the tactical category, neither considering range nor yield of the nuclear weapon. Modern tactical nuclear warheads have yields up to the tens of kilotons, or potentially hundreds, several times that of the used in the atomic bombings of Hiroshima. Use of tactical nuclear weapons against similarly-armed opponents carries a significant danger of escalating the conflict beyond anticipated boundaries. For example, firing a nuclear artillery shell similar to the W48 at the enemy invites retaliation. It may provoke the enemy into responding with several artillery shells similar to the W79. By using tactical nuclear weapons there is a risk of escalating the conflict until it reaches a tipping point which provokes the use of strategic nuclear weapons such as ICBMs. Additionally, the nuclear weapons most likely to be used first have usually been under less stringent political control at times of military combat crises than strategic weapons. Early Permissive Action Links could be as simple as a combination lock. For these reasons, stockpiles of nuclear warheads in most countries arsenals have been dramatically reduced c. 2010, and the smallest types have been completely eliminated, some variable yield nuclear warheads such as the B61 nuclear bomb have been produced in both tactical and strategic versions. This concept was formalized when Putin took power in Russia in the following year, ten NATO member countries have advanced a confidence-building plan for NATO and Russia that could lead to treaties to reduce the tactical nuclear weapons in Europe
5.
Shell (projectile)
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A shell is a payload-carrying projectile that, as opposed to shot, contains an explosive or other filling, though modern usage sometimes includes large solid projectiles properly termed shot. Solid shot may contain a pyrotechnic compound if a tracer or spotting charge is used, originally, it was called a bombshell, but shell has come to be unambiguous in a military context. Words cognate with grenade are still used for an artillery or mortar projectile in some European languages, shells are usually large-calibre projectiles fired by artillery, combat vehicles, and warships. Shells usually have the shape of a cylinder topped by a nose for good aerodynamic performance, possibly with a tapering base. Solid cannonballs did not need a fuse, but hollow munitions filled with something such as gunpowder to fragment the ball, needed a fuse, percussion fuses with a spherical projectile presented a challenge because there was no way of ensuring that the impact mechanism hit the target. Therefore, shells needed a fuse that was ignited before or during firing. The earliest record of shells being used in combat was by the Republic of Venice at Jadra in 1376, shells with fuses were used at the 1421 siege of St Boniface in Corsica. These were two hollowed hemispheres of stone or bronze held together by an iron hoop, as described in their book, these hollow, gunpowder-packed shells were made of cast iron. At least since the 16th Century grenades made of ceramics or glass were in use in Central Europe, a hoard of several hundred ceramic greandes were discovered during building works in front of a bastion of the Bavarian City of Ingolstadt, Germany dated to the 17th Century. Lots of the grenades obtained their orignal blackpowder loads and igniters, most probably the grenades were intentionally dumped the moat of the bastion before the year 1723. Early powder burning fuses had to be loaded fuse down to be ignited by firing or a portfire put down the barrel to light the fuse, other shells were wrapped in bitumen cloth, which would ignite during the firing and in turn ignite a powder fuse. Nevertheless, shells came into use in the 16th Century. By the 18th Century, it was known that the fuse towards the muzzle could be lit by the flash through the windage between the shell and the barrel, the use of exploding shells from field artillery became relatively commonplace from early in the 19th century. Until the mid 19th century, shells remained as simple exploding spheres that used gunpowder and they were usually made of cast iron, but bronze, lead, brass and even glass shell casings were experimented with. The word bomb encompassed them at the time, as heard in the lyrics of The Star-Spangled Banner, typically, the thickness of the metal body was about a sixth of their diameter and they were about two thirds the weight of solid shot of the same calibre. To ensure that shells were loaded with their fuses towards the muzzle, in 1819, a committee of British artillery officers recognised that they were essential stores and in 1830 Britain standardised sabot thickness as a half inch. The sabot was also intended to reduce jamming during loading, despite the use of exploding shell, the use of smoothbore cannons, firing spherical projectiles of shot, remained the dominant artillery method until the 1850s. By the late 18th century, artillery could use canister shot to defend itself from infantry or cavalry attack and this involved loading a tin or canvas container filled with small iron or lead balls instead of the usual cannonball
6.
Cannon
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A cannon is any piece of artillery that uses gunpowder or other usually explosive-based propellants to launch a projectile, which may or may not be explosive. The word cannon is derived from languages, in which the original definition can usually be translated as tube, cane. The Greeks invented the first type—a steam cannon—designed by Archimedes during the Siege of Syracuse, ctesibius built a steam cannon in Alexandria and in the fifteenth century Leonardo da Vinci designed another, the Architonnerre, based on Archimedes work. The earliest form of artillery was developed in Song China, over time replacing siege engines. In the Middle East, the first use of the cannon is argued to be during the 1260 Battle of Ain Jalut between the Mamluk Sultanate and Mongol Empire. The first cannon in Europe were in use in the Iberian Peninsula by the mid-13th century and it was during this period, the Middle Ages, that cannon became standardised, and more effective in both the anti-infantry and siege roles. After the Middle Ages most large cannon were abandoned in favour of greater numbers of lighter, Cannon also transformed naval warfare in the early modern period, as European navies took advantage of their firepower. In World War I, the majority of fatalities were caused by artillery. Most modern cannon are similar to those used in the Second World War, Cannon was widely known as the earliest form of a gun and artillery, before early firearms were invented. The word has been used to refer to a gun since 1326 in Italy, both Cannons and Cannon are correct and in common usage, with one or the other having preference in different parts of the English-speaking world. Cannons is more common in North America and Australia, while cannon as plural is more common in the United Kingdom, Cannon in general have the form of a truncated cone with an internal cylindrical bore for holding an explosive charge and a projectile. The thickest, strongest, and closed part of the cone is located near the explosive charge, as any explosive charge will dissipate in all directions equally, the thickest portion of the cannon is useful for containing and directing this force. Field artillery cannon in Europe and the Americas were initially made most often of bronze, though later forms were constructed of cast iron and eventually steel. However, cast iron cannon have a tendency to burst without having any previous weakness or wear. The following terms refer to the components or aspects of a classical western cannon as illustrated here. In what follows, the words near, close, and behind will refer to those parts towards the thick, closed end of the piece, and far, front, in front of, and before to the thinner, open end. Bore, The hollow cylinder bored down the centre of the cannon, including the base of the bore or bottom of the bore, the diameter of the bore represents the cannons calibre. Chamber, The cylindrical, conical, or spherical recess at the nearest end of the bottom of the bore into which the gunpowder is packed
7.
Artillery rocket
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Rocket artillery is a type of artillery equipped with rocket launchers instead of conventional guns or mortars. Types of rocket artillery pieces include multiple rocket launchers, the use of rockets as some form of artillery dates back to medieval China where devices such as fire arrows were used. Fire arrows were used in multiple launch systems and transported via carts. Devices such as the Korean hwacha were able to fire hundreds of fire arrows simultaneously, the use of medieval rocket artillery was picked up by the invading Mongols and spread to the Ottoman Turks who in turn used them on the European battlefield. The use of war-rockets is well documented in Medieval Europe, in 1408 Duke John the Fearless of Burgundy used 300 incendiary rockets in the siege of Liège. The city dwellers coped with this tactic by covering their roofs with dirt, the earliest successful utilization of rocket artillery is associated with Tipu Sultan of Mysore. Tipu Sultans father Hyder Ali successfully established the powerful Sultanate of Mysore, Tipu Sultan used them against the larger forces of the British East India Company during the Anglo-Mysore Wars especially during the Battle of Pollilur. Although the rockets were quite primitive, they had an effect on the enemy due to the noise. Although the hammered soft iron he used was crude, the strength of the container of black powder was much higher than the earlier paper construction. Thus a greater pressure was possible, with a resultant greater thrust of the propulsive jet. The rocket body was lashed with leather thongs to a bamboo stick. Range was perhaps up to three-quarters of a mile, although individually these rockets were not accurate, dispersion error became less important when large numbers were fired rapidly in mass attacks. They were particularly effective against cavalry and were hurled into the air, after lighting, or skimmed along the hard dry ground. Hyder Alis son, Tipu Sultan, continued to develop and expand the use of rocket weapons, in battles at Seringapatam in 1792 and 1799 these rockets were used with considerable effect against the British. The Indian rocket experiences, including Munros book of 1789, eventually led to the Royal Arsenal beginning a military rocket R&D program in 1801, several rocket cases were collected from Mysore and sent to Britain for analysis. The development was chiefly the work of Col and he was told that the British at Seringapatam had suffered more from the rockets than from the shells or any other weapon used by the enemy. In at least one instance, an eye-witness told Congreve, a rocket had killed three men and badly wounded others. In the Battle of Pollilur and in the battles at Seringapatam in 1792 and 1799 these rockets were used with effect against the British
8.
Tactical ballistic missile
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A tactical ballistic missile is a ballistic missile designed for short-range battlefield use. Typically, range is less than 300 kilometres, warheads can include conventional high explosive, chemical, biological, or nuclear warheads. Typically tactical nuclear weapons are limited in their total compared to strategic rockets. Tactical ballistic missiles fill the gap between conventional rocket artillery and longer-range short-range ballistic missiles, tactical missiles can carry heavy payloads deep behind enemy lines in comparison to rockets or tube artillery, while having better mobility and less expense than the more strategic theatre missiles. Additionally, due to their mobility, tactical missiles are better suited to responding to developments on the battlefield, for many nations, tactical missiles represent the upper limit of their land-based military equipment. They can provide a weapon for a very economical price. Currently, ballistic missile technology is accessible to nations that may find other military technology beyond easy reach. Ballistic missiles are still difficult to defeat on the battlefield, newer air defense systems have improved ability to intercept tactical missiles, but still can not reliably protect assets against ballistic missile threats. Early large rockets and missiles were propelled by liquid-propellant rocket engines and these were replaced as soon as possible by solid fuel rocket motors. Liquid propellants involve cryogenic or corrosive oxidisers and these must be loaded before launch, delaying the rockets time into action. This delay was a problem for large strategic missiles, but especially so for tactical, missiles, particularly in the Soviet Union, switched to using storable liquid propellants such as IRFNA, inhibited nitric acid. These were still hazardous to handle, but could be stored pre-loaded in the missile and this also allowed the development of single vehicle transporter erector launchers, rather than the previous convoy of carriers, launchers, fuel vehicles and service vehicles. Western missiles adopted solid propellants instead, which were inherently storable, tactical missiles are now almost universally solid-fuelled, except for some satellite states using indigenous developments of the original Scud platform
9.
State (polity)
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A state is a type of polity that is an organized political community living under a single system of government. States may or may not be sovereign, for instance, federated states are members of a federal union, and may have only partial sovereignty, but are, nonetheless, states. Some states are subject to external sovereignty or hegemony, in which ultimate sovereignty lies in another state, States that are sovereign are known as sovereign states. The term state can also refer to the branches of government within a state, often as a manner of contrasting them with churches. Speakers of American English often use the state and government as synonyms. Many human societies have been governed by states for millennia, over time a variety of different forms developed, employing a variety of justifications of legitimacy for their existence. In the 21st century, the modern nation-state is the predominant form of state to which people are subjected, there is no academic consensus on the most appropriate definition of the state. The term state refers to a set of different, but interrelated and often overlapping, general categories of state institutions include administrative bureaucracies, legal systems, and military or religious organizations. Another commonly accepted definition of the state is the one given at the Montevideo Convention on Rights, according to the Oxford English Dictionary, a state is a. an organized political community under one government, a commonwealth, a nation. B. such a community forming part of a federal republic, confounding the definition problem is that state and government are often used as synonyms in common conversation and even some academic discourse. According to this schema, the states are nonphysical persons of international law. The relationship between a government and its state is one of representation and authorized agency, States may be classified as sovereign if they are not dependent on, or subject to any other power or state. Other states are subject to external sovereignty or hegemony where ultimate sovereignty lies in another state, many states are federated states which participate in a federal union. A federated state is a territorial and constitutional community forming part of a federation, such states differ from sovereign states in that they have transferred a portion of their sovereign powers to a federal government. One can commonly and sometimes readily classify states according to their apparent make-up or focus, the concept of the nation-state, theoretically or ideally co-terminous with a nation, became very popular by the 20th century in Europe, but occurred rarely elsewhere or at other times. Imperial states have sometimes promoted notions of racial superiority, the concept of temple states centred on religious shrines occurs in some discussions of the ancient world. To some extent, urban secession, the creation of a new city-state, a state can be distinguished from a government. The government is the group of people, the administrative bureaucracy that controls the state apparatus at a given time
10.
Soviet Union
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The Soviet Union, officially the Union of Soviet Socialist Republics was a socialist state in Eurasia that existed from 1922 to 1991. It was nominally a union of national republics, but its government. The Soviet Union had its roots in the October Revolution of 1917 and this established the Russian Socialist Federative Soviet Republic and started the Russian Civil War between the revolutionary Reds and the counter-revolutionary Whites. In 1922, the communists were victorious, forming the Soviet Union with the unification of the Russian, Transcaucasian, Ukrainian, following Lenins death in 1924, a collective leadership and a brief power struggle, Joseph Stalin came to power in the mid-1920s. Stalin suppressed all opposition to his rule, committed the state ideology to Marxism–Leninism. As a result, the country underwent a period of rapid industrialization and collectivization which laid the foundation for its victory in World War II and postwar dominance of Eastern Europe. Shortly before World War II, Stalin signed the Molotov–Ribbentrop Pact agreeing to non-aggression with Nazi Germany, in June 1941, the Germans invaded the Soviet Union, opening the largest and bloodiest theater of war in history. Soviet war casualties accounted for the highest proportion of the conflict in the effort of acquiring the upper hand over Axis forces at battles such as Stalingrad. Soviet forces eventually captured Berlin in 1945, the territory overtaken by the Red Army became satellite states of the Eastern Bloc. The Cold War emerged by 1947 as the Soviet bloc confronted the Western states that united in the North Atlantic Treaty Organization in 1949. Following Stalins death in 1953, a period of political and economic liberalization, known as de-Stalinization and Khrushchevs Thaw, the country developed rapidly, as millions of peasants were moved into industrialized cities. The USSR took a lead in the Space Race with Sputnik 1, the first ever satellite, and Vostok 1. In the 1970s, there was a brief détente of relations with the United States, the war drained economic resources and was matched by an escalation of American military aid to Mujahideen fighters. In the mid-1980s, the last Soviet leader, Mikhail Gorbachev, sought to reform and liberalize the economy through his policies of glasnost. The goal was to preserve the Communist Party while reversing the economic stagnation, the Cold War ended during his tenure, and in 1989 Soviet satellite countries in Eastern Europe overthrew their respective communist regimes. This led to the rise of strong nationalist and separatist movements inside the USSR as well, in August 1991, a coup détat was attempted by Communist Party hardliners. It failed, with Russian President Boris Yeltsin playing a role in facing down the coup. On 25 December 1991, Gorbachev resigned and the twelve constituent republics emerged from the dissolution of the Soviet Union as independent post-Soviet states
