1.
Depth charge
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A depth charge is an anti-submarine warfare weapon. It is intended to destroy a submarine by being dropped into the nearby and detonating, subjecting the target to a powerful. Most depth charges use high explosive charges and a set to detonate the charge. Depth charges can be dropped by ships, patrol aircraft, Depth charges were developed during World War I, and were one of the first effective methods of attacking a submarine underwater. They were widely used in World War I and World War II and they remained part of the anti-submarine arsenals of many navies during the Cold War. Depth charges have now largely replaced by anti-submarine homing torpedoes. A depth charge fitted with a warhead is known as a nuclear depth bomb. These were designed to be dropped from a plane or deployed by an anti-submarine missile from a surface ship, or another submarine. All nuclear anti-submarine weapons were withdrawn from service by the United States, the United Kingdom, France, Russia and they were replaced by conventional weapons whose accuracy and range had improved greatly as ASW technology improved. The first attempt to fire charges against submerged targets was with aircraft bombs attached to lanyards which triggered them, a similar idea was a 16 lb guncotton charge in a lanyarded can. Two of these together became known as the depth charge Type A. Problems with the lanyards tangling and failing to function led to the development of a chemical pellet trigger as the Type B and these were effective at a distance of around 20 ft. A1913 Royal Navy Torpedo School report described a device intended for countermining, at Admiral John Jellicoes request, the standard Mark II mine was fitted with a hydrostatic pistol preset for 45 ft firing, to be launched from a stern platform. Weighing 1,150 lb, and effective at 100 ft, the design work was carried out by Herbert Taylor at the RN Torpedo and Mine School, HMS Vernon. The first effective depth charge, the Type D, became available in January 1916 and it was a barrel-like casing containing a high explosive. There were initially two sizes—Type D, with a 300 lb charge for fast ships, and Type D* with a 120 lb charge for ships too slow to leave the area before the more powerful charge detonated. A hydrostatic pistol actuated by water pressure at a pre-selected depth detonated the charge, initial depth settings were 40 or 80 ft. Because production could not keep up with demand, anti-submarine vessels initially carried two depth charges, to be released from a chute at the stern of the ship
2.
Fairey Battle
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The Fairey Battle was a British single-engine light bomber designed and manufactured by the Fairey Aviation Company. It was developed during the mid-1930s for the Royal Air Force as a successor to the earlier Hawker Hart. The Fairey Battle participated in combat missions during early stages of the Second World War. During the Phoney War, the type achieved the distinction of attaining the first aerial victory of an RAF aircraft in the conflict, however, by May 1940, the Battle had suffered heavy losses, frequently in excess of 50 per cent of sortied aircraft per mission. By the end of 1940, the type had been withdrawn from active combat service. For an aircraft which had been viewed to possess a level of pre-war promise. A requirement of the aircraft was to be capable of carrying 1,000 lb bombs over a distance of 1,000 miles while flying at a speed of 200 MPH. The Fairey Aviation Company were keen to produce a design to meet the demands of Specification P. 27/32, the Belgian aeronautical engineer Marcel Lobelle served as the aircrafts principal designer. One of the decisions made by Lobelle on the project was the use of the newly developed Rolls-Royce Merlin I engine. The Merlin engine was paired to a de Havilland Propellers-built three-bladed variable-pitch propeller unit. The choice of engine enabled the designing of the aircraft to possess exceptionally clean lines, the resulting design was an all-metal single-engine aircraft, which adopted a low-mounted cantilever monoplane wing and was equipped with a retractable tail wheel undercarriage. A total of four decided to formally respond to Specification P. 27/32, these being the Fairey, Hawker Aircraft, Armstrong Whitworth Aircraft. Of the submissions made, the Air Ministry selected Armstrong Whitworth, on 10 March 1936, the first Fairey prototype, K4303, equipped with a Merlin I engine capable of generating 1,030 hp, performed its maiden flight at Hayes, Middlesex. In 1936, further orders were placed for Fairey to built addition Battles to Specification P. 14/36, in June 1937, the first production Battle, K7558, conducted its maiden flight. K7558 was later used to perform a series of official handling, during these trials, it demonstrated the Battles ability to conduct missions of a 1,000 mile range while under a full bomb load. The first 136 Fairey-built Battles were powered by the Merlin I, by the end of 1937,85 Battles had been completed and a number of RAF squadrons had been reequipped, or were otherwise in the process of re-equipping, with the type. As the RAF embarked on what became a substantial pre-war expansion programme, accordingly, there was at one point a total of 2,419 aircraft were on order for the service. In June 1937, the first aircraft was completed at Hayes, however, all subsequent aircraft were manufactured at Faireys newly completed factory at Heaton Chapel, completed aircraft were promptly dispatched for testing at the companys facility adjacent to RAF Ringway, Manchester
3.
Machine gun
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A machine gun is a fully automatic mounted or portable firearm designed to fire bullets in quick succession from an ammunition belt or magazine, typically at a rate of 300 to 1800 rounds per minute. Note that not all fully automatic firearms are machine guns, submachine guns, rifles, assault rifles, shotguns, pistols or cannons may be capable of fully automatic fire, but are not designed for sustained fire. Many machine guns also use belt feeding and open bolt operation, unlike semi-automatic firearms, which require one trigger pull per round fired, a machine gun is designed to fire for as long as the trigger is held down. Nowadays the term is restricted to heavy weapons, able to provide continuous or frequent bursts of automatic fire for as long as ammunition lasts. Machine guns are used against personnel, aircraft and light vehicles, or to provide suppressive fire. Some machine guns have in practice sustained fire almost continuously for hours, because they become very hot, practically all machine guns fire from an open bolt, to permit air cooling from the breech between bursts. They also usually have either a barrel cooling system, slow-heating heavyweight barrel, although subdivided into light, medium, heavy or general-purpose, even the lightest machine guns tend to be substantially larger and heavier than standard infantry arms. Medium and heavy guns are either mounted on a tripod or on a vehicle, when carried on foot. Medium machine guns use full-sized rifle rounds and are designed to be used from fixed positions mounted on a tripod. 50in, the M249 automatic rifle is operated by an automatic rifleman, but its ammunition may be carried by other Soldiers within the squad or unit. The M249 machine gun is a crew-served weapon, Machine guns usually have simple iron sights, though the use of optics is becoming more common. Many heavy machine guns, such as the Browning M2.50 caliber machine gun, are enough to engage targets at great distances. During the Vietnam War, Carlos Hathcock set the record for a shot at 7382 ft with a.50 caliber heavy machine gun he had equipped with a telescopic sight. This led to the introduction of.50 caliber anti-materiel sniper rifles, selective fire rifles firing a full-power rifle cartridge from a closed bolt are called automatic rifles or battle rifles, while rifles that fire an intermediate cartridge are called assault rifles. Unlocking and removing the spent case from the chamber and ejecting it out of the weapon as bolt is moving rearward Loading the next round into the firing chamber. Usually the recoil spring tension pushes bolt back into battery and a cam strips the new round from a feeding device, cycle is repeated as long as the trigger is activated by operator. Releasing the trigger resets the trigger mechanism by engaging a sear so the weapon stops firing with bolt carrier fully at the rear, the operation is basically the same for all autoloading firearms, regardless of the means of activating these mechanisms. Most modern machine guns use gas-operated reloading, a recoil actuated machine gun uses the recoil to first unlock and then operate the action. Machine guns such as the M2 Browning and MG42, are of this type, a cam, lever or actuator demultiplicates the energy of the recoil to operate the bolt
4.
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
5.
Vickers-Armstrongs
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Vickers-Armstrongs Limited was a British engineering conglomerate formed by the merger of the assets of Vickers Limited and Sir W G Armstrong Whitworth & Company in 1927. The majority of the company was nationalised in the 1960s and 1970s, Vickers merged with the Tyneside-based engineering company Armstrong Whitworth, founded by W. G. Armstrong, to become Vickers-Armstrongs, Ltd. Armstrong Whitworth and Vickers had developed along lines, expanding into various military sectors. Armstrong Whitworth were notable for their manufacture at Elswick and shipbuilding at a yard at High Walker on the River Tyne. 1929 saw the merger of the railway business with those of Cammell Laird to form Metropolitan Cammell Carriage and Wagon. In 1935, before rearmament began, Vickers-Armstrongs was the third-largest manufacturing employer in Britain, behind Unilever, in 1960 the aircraft interests were merged with those of Bristol, English Electric and Hunting Aircraft to form the British Aircraft Corporation. This was owned by Vickers, English Electric and Bristol, BAC in turn owned 70% of Hunting. The Supermarine operation was closed in 1963 and the Vickers brand name for aircraft was dropped by BAC in 1965, under the terms of the Aircraft and Shipbuilding Industries Act 1977 BAC was nationalised to become part of British Aerospace. The Aircraft and Shipbuilding Industries Act also led to the nationalisation of Vickers shipbuilding division as part of British Shipbuilders, Vickers Container and Packaging Machinery Division, including the Vickers Stitcher and Vickers Hardness Machine business, was bought by Fords Industrial Products, part of Barry Wehmiller in 1986. In 1991 the Vickers Hardness Machinery business was bought by the field engineers. The Vickers Stitcher was still being manufactured in India as recently as 2005, the steelmaking division became part of British Steel Corporation and the remaining interests were divested as the public company Vickers plc, whose various components were later split. The Vickers name ceased to exist in 2003 when Rolls-Royce renamed its acquisitions Vinters plc, Vickers-Armstrongs inherited the Vickers machine gun of 1912 used in World War I from Vickers Limited. An unusual machine gun also made was the Vickers Higson, Vickers produced larger weapons such as the Ordnance QF 2-pounder gun used on tanks. In 1948 Vickers bought the Australian business of Charles Ruwolt Ltd for £750,000 following Ruwolts death in 1946, during WW2 Ruwolts firm produced armaments for the Australian Government, including field artillery such as mortars and howitzer cannon. Vickers-Armstrongs was one of the most important warship manufacturers in the world and these interests were renamed as Vickers-Armstrongs Shipbuilders in 1955, changing again to Vickers Limited Shipbuilding Group in 1968. The Barrow yard was nationalised and became part of British Shipbuilders in 1977, was privatised as VSEL in 1986, the company was also known for its tank designs, starting with the widely used Vickers 6-Ton. It also produced the influential, if never actually produced, Independent A1E1 tank, one of the companys most important designs was the Valentine Infantry Tank, produced in the thousands in World War II. The military vehicle manufacturing interests were divested into Vickers plc, and would pass to Alvis Vickers, now part of BAE Systems Land
6.
Vickers K machine gun
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The high rate of fire was needed for the small period of time when the gunner would be able to fire at an attacking aircraft. The weapon was adopted for land use during World War II. The Vickers K was a development of the Vickers-Berthier light machine gun, the VB, like the Bren light machine gun, used a tilting locking breechblock. However, unlike the Bren, the VB locked its breech only at the last moment of forward travel and this enabled the development of the Vickers K also known as the Vickers Gas Operated or Vickers GO. With lighter moving parts and the VB locking design, the Vickers K had a rate of fire between 950 and 1,200 rounds per minute, faster than the German MG34. The weapon was adopted for British service as the VGO and it was test-flown with a large 300-round pan magazine, and beat the.303 Browning in reliability. However, the pan would have caused problems to accommodate. When the belt-fed Browning Mark II was selected as the standard armament for RAF aircraft. It continued to be used by the Fleet Air Arm until 1945, some were made in 7. 7mm for the Belgians before the war and at least one example survives in a European museum. The Vickers class K/Vickers G. O. machine gun is a gas operated weapon and its gas cylinder is located below the barrel, and a long stroke gas piston operates a vertically tilting bolt. Feed is from top-mounted flat pan magazines with a capacity of 100 rounds. The gun is fitted with a spade grip at the rear of receiver. In ground use, it was mounted on single or twin pintle mounts on various jeeps. Originally intended for RAF airfield defence units, these guns were remanufactured from original Vickers G. O. No.1 Mk.1 aircraft guns, a number of these ‘Vickers G. O. Land Service’ machine guns found their way to a variety of British Commando, the Land variant has the spade grip replaced with a semi bullpup short stock at the rear and a pistol grip with trigger below the receiver. A short forend or a carrying handle are added below the gas cylinder. New iron sights are provided on folding bases, a camera gun version was made for training. The body was of cast metal, the grip and trigger mechanism were realistic
7.
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
8.
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
9.
.303 British
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The.303 British or 7. 7×56mmR, is a. 303-inch calibre rimmed rifle cartridge first developed in Britain as a black-powder round put into service in December 1888 for the Lee–Metford rifle. In 1891 the cartridge was adapted to use smokeless powder and it was the standard British and Commonwealth military cartridge from 1889 until the 1950s when it was replaced by the 7. 62×51mm NATO. The.303 British has 3.64 ml cartridge case capacity, americans would define the shoulder angle at alpha/2 ≈17 degrees. The common rifling twist rate for this cartridge is 254 mm,5 grooves, Ø lands =7.70 millimetres, Ø grooves =7.92 millimetres, land width =2.12 millimetres and the primer type is Berdan or Boxer. Rulings the.303 British can handle up to 365.00 MPa Pmax piezo pressure, regulated countries every rifle cartridge combo has to be proofed at 125% of this maximum C. I. P. pressure to certify for sale to consumers. This means that.303 British chambered arms in C. I. P, regulated countries are currently proof tested at 456.00 MPa PE piezo pressure. The SAAMI Maximum Average Pressure for this cartridge is 49,000 psi piezo pressure, the measurement. 303-inch is the nominal size of the bore measured between the lands which follows the older black powder nomenclature. Measured between the grooves, the size of the bore is. 311-inch. Bores for many.303 military surplus rifles are found ranging from around. 309-inch up to. 318-inch. Recommended bullet diameter for standard.303 British cartridges is. 312-inch, the bolt thrust of the.303 British is relatively low compared to many other service rounds used in the early 20th century. The original.303 British service cartridge employed black powder as a propellant, and was adopted for the Lee–Metford rifle, ballistite was a stick-type smokeless powder composed of soluble nitrocellulose and nitroglycerine. Unlike Cordite, Riflelite was a powder, and contained no nitroglycerine. After extensive testing, the Committee on Explosives selected Cordite for use in the Mark II.303 British service cartridge, the initial.303 Mark I and Mk II service cartridges employed a 215-grain, round-nosed, copper-nickel full-metal-jacketed bullet with a lead core. After tests determined that the bullet had too thin a jacket when used with cordite. This led to the introduction of the Cartridge S. A. Ball.303 inch Cordite Mark III, similar hollow-point bullets were used in the Mk IV and Mk V loadings, which were put into mass production. The design of the Mk IV hollow-point bullet shifted bullet weight rearwards, improving stability, the remaining stocks were used for target practice. The concern about expanding bullets was brought up at the 1899 Hague Convention by Swiss, the British and American defense was that they should not focus on specific bullet designs, like hollow-points, but instead on rounds that caused superfluous injury. The parties in the end agreed to abstain from using expanding bullets, as a result, the Mark III and other expanding versions of the.303 were not issued during the Second Boer War
