Militärhistorisches Museum Flugplatz Berlin-Gatow
The Militärhistorisches Museum der Bundeswehr - Flugplatz Berlin-Gatow, is the Berlin branch of the Bundeswehr Military History Museum. The museum acts as an independent military department; the museum is in Berlin at RAF Gatow. The focus is on military history the history of the post-war German Air Force; the museum has a collection of more than 200,000 items, including 155 aeroplanes, 5,000 uniforms and 30,000 books. There are displays on the history of the airfield when it was used by the RAF. Aircraft include World War I planes such as the Fokker E. III as reproductions, World War II planes such as the Bf 109, as well as at least one aircraft of every type to serve in the air forces of East and West Germany. Most of those postwar aircraft are stored outside on the tarmac and runways and many are in bad condition. There are long term restoration projects, including a Focke-Wulf Fw 190; because of that the museum is under construction, some exhibits can shortly removed for restoration, repainting or lending to other museums.
MHM Flugplatz Berlin-Gatow Förderverein des Luftwaffenmuseums der Bundeswehr e. V. Luftwaffenmuseum der Bundeswehr Berlin-Gatow Picture gallery "Arbeitsgruppe historische Luftfahrttechnik Daedalus" Video montage of site aircraft
World War II
World War II known as the Second World War, was a global war that lasted from 1939 to 1945. The vast majority of the world's countries—including all the great powers—eventually formed two opposing military alliances: the Allies and the Axis. A state of total war emerged, directly involving more than 100 million people from over 30 countries; the major participants threw their entire economic and scientific capabilities behind the war effort, blurring the distinction between civilian and military resources. World War II was the deadliest conflict in human history, marked by 50 to 85 million fatalities, most of whom were civilians in the Soviet Union and China, it included massacres, the genocide of the Holocaust, strategic bombing, premeditated death from starvation and disease, the only use of nuclear weapons in war. Japan, which aimed to dominate Asia and the Pacific, was at war with China by 1937, though neither side had declared war on the other. World War II is said to have begun on 1 September 1939, with the invasion of Poland by Germany and subsequent declarations of war on Germany by France and the United Kingdom.
From late 1939 to early 1941, in a series of campaigns and treaties, Germany conquered or controlled much of continental Europe, 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, Finland and the Baltic states. Following the onset of campaigns in North Africa and East Africa, the fall of France in mid 1940, the war continued between the European Axis powers and the British Empire. War in the Balkans, the aerial Battle of Britain, the Blitz, the long Battle of the Atlantic followed. On 22 June 1941, the European Axis powers launched an invasion of the Soviet Union, opening the largest land theatre of war in history; this Eastern Front trapped most crucially the German Wehrmacht, into a war of attrition. In December 1941, Japan launched a surprise attack on the United States as well as European colonies in the Pacific. Following an immediate U. S. declaration of war against Japan, supported by one from Great Britain, the European Axis powers declared war on the U.
S. in solidarity with their Japanese ally. Rapid Japanese conquests over much of the Western Pacific ensued, perceived by many in Asia as liberation from Western dominance and resulting in the support of several armies from defeated territories; the Axis advance in the Pacific halted in 1942. Key setbacks in 1943, which included a series of German defeats on the Eastern Front, the Allied invasions of Sicily and Italy, Allied victories in the Pacific, cost the Axis its initiative and forced it into strategic retreat on all fronts. In 1944, the Western Allies invaded German-occupied France, while the Soviet Union regained its territorial losses and turned toward Germany and its allies. During 1944 and 1945 the Japanese suffered major reverses in mainland Asia in Central China, South China and Burma, while the Allies crippled the Japanese Navy and captured key Western Pacific islands; the war in Europe concluded with an invasion of Germany by the Western Allies and the Soviet Union, culminating in the capture of Berlin by Soviet troops, the suicide of Adolf Hitler and the German unconditional surrender on 8 May 1945.
Following the Potsdam Declaration by the Allies on 26 July 1945 and the refusal of Japan to surrender under its terms, the United States dropped atomic bombs on the Japanese cities of Hiroshima and Nagasaki on 6 and 9 August respectively. With an invasion of the Japanese archipelago imminent, the possibility of additional atomic bombings, the Soviet entry into the war against Japan and its invasion of Manchuria, Japan announced its intention to surrender on 15 August 1945, cementing total victory in Asia for the Allies. Tribunals were set up by fiat by the Allies and war crimes trials were conducted in the wake of the war both against the Germans and the Japanese. World War II changed the political social structure of the globe; the United Nations was established to foster international co-operation and prevent future conflicts. The Soviet Union and United States emerged as rival superpowers, setting the stage for the nearly half-century long Cold War. In the wake of European devastation, the influence of its great powers waned, triggering the decolonisation of Africa and Asia.
Most countries whose industries had been damaged moved towards economic expansion. Political integration in Europe, emerged as an effort to end pre-war enmities and create a common identity; the start of the war in Europe is held to be 1 September 1939, beginning with the German invasion of Poland. The dates for the beginning of war in the Pacific include the start of the Second Sino-Japanese War on 7 July 1937, or 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 and the two wars merged in 1941; 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 fo
An arc lamp or arc light is a lamp that produces light by an electric arc. The carbon arc light, which consists of an arc between carbon electrodes in air, invented by Humphry Davy in the first decade of the 1800s, was the first practical electric light, it was used starting in the 1870s for street and large building lighting until it was superseded by the incandescent light in the early 20th century. It continued in use in more specialized applications where a high intensity point light source was needed, such as searchlights and movie projectors until after World War II; the carbon arc lamp is now obsolete for most of these purposes, but it is still used as a source of high intensity ultraviolet light. The term is now used for gas discharge lamps, which produce light by an arc between metal electrodes through an inert gas in a glass bulb; the common fluorescent lamp is a low-pressure mercury arc lamp. The xenon arc lamp, which produces a high intensity white light, is now used in many of the applications which used the carbon arc, such as movie projectors and searchlights.
An arc is the discharge. A high voltage is pulsed across the lamp to "ignite" or "strike" the arc, after which the discharge can be maintained at a lower voltage; the "strike" requires an electrical circuit with a ballast. The ballast performs two functions. First, when the power is first switched on, the igniter/starter sets up a small current through the ballast and starter; this creates a small magnetic field within the ballast windings. A moment the starter interrupts the current flow from the ballast, which has a high inductance and therefore tries to maintain the current flow; as a result, a high voltage appears across the ballast momentarily. The circuit will repeat this action; when the lamp sustains the arc, the ballast performs its second function, to limit the current to that needed to operate the lamp. The lamp and igniter are rating-matched to each other; the colour of the light emitted by the lamp changes as its electrical characteristics change with temperature and time. Lightning is a similar principle where the atmosphere is ionized by the high potential difference between earth and storm clouds.
The temperature of the arc in an arc lamp can reach several thousand degrees Celsius. The outer glass envelope can reach 500 degrees Celsius, therefore before servicing one must ensure the bulb has cooled sufficiently to handle. If these types of lamps are turned off or lose their power supply, one cannot restrike the lamp again for several minutes. However, some lamps can be restruck as soon; the Vortek water-wall plasma arc lamp, invented in 1975 by David Camm and Roy Nodwell at the University of British Columbia, Canada, made the Guinness Book of World Records in 1986 and 1993 as the most powerful continuously burning light source at over 300 kW or 1.2 million candle power. In popular use, the term arc lamp means carbon arc lamp only. In a carbon arc lamp, the electrodes are carbon rods in free air. To ignite the lamp, the rods are touched together, thus allowing a low voltage to strike the arc; the rods are slowly drawn apart, electric current heats and maintains an arc across the gap. The tips of the carbon rods are heated and the carbon vaporizes.
The carbon vapor in the arc is luminous, what produces the bright light. The rods are burnt away in use, the distance between them needs to be adjusted in order to maintain the arc. Many ingenious mechanisms were invented to effect the distance automatically based on solenoids. In one of the simplest mechanically-regulated forms the electrodes are mounted vertically; the current supplying the arc is passed in series through a solenoid attached to the top electrode. If the points of the electrodes are touching the resistance falls, the current increases and the increased pull from the solenoid draws the points apart. If the arc starts to fail the current drops and the points close up again; the Yablochkov candle is a simple arc lamp without a regulator, but it has the drawbacks that the arc cannot be restarted and a limited lifetime of only a few hours. The concept of carbon-arc lighting was first demonstrated by Sir Humphry Davy in the early 19th century, using charcoal sticks and a two thousand cell battery to create an arc across a 4-inch gap.
He mounted his electrodes horizontally and noted that, because of the strong convection flow of air, the arc formed the shape of an arch. He coined the term "arch lamp", contracted to "arc lamp" when the devices came into common usage. In the late nineteenth century, electric arc lighting was in wide use for public lighting; the tendency of electric arcs to flicker and hiss was a major problem. In 1895, Hertha Ayrton wrote a series of articles for the Electrician, explaining that these phenomena were the result of oxygen coming into contact with the carbon rods used to create the arc. In 1899, she was the firs
Radar is a detection system that uses radio waves to determine the range, angle, or velocity of objects. It can be used to detect aircraft, spacecraft, guided missiles, motor vehicles, weather formations, terrain. A radar system consists of a transmitter producing electromagnetic waves in the radio or microwaves domain, a transmitting antenna, a receiving antenna and a receiver and processor to determine properties of the object. Radio waves from the transmitter reflect off the object and return to the receiver, giving information about the object's location and speed. Radar was developed secretly for military use by several nations in the period before and during World War II. A key development was the cavity magnetron in the UK, which allowed the creation of small systems with sub-meter resolution; the term RADAR was coined in 1940 by the United States Navy as an acronym for RAdio Detection And Ranging The term radar has since entered English and other languages as a common noun, losing all capitalization.
The modern uses of radar are diverse, including air and terrestrial traffic control, radar astronomy, air-defense systems, antimissile systems, marine radars to locate landmarks and other ships, aircraft anticollision systems, ocean surveillance systems, outer space surveillance and rendezvous systems, meteorological precipitation monitoring and flight control systems, guided missile target locating systems, ground-penetrating radar for geological observations, range-controlled radar for public health surveillance. High tech radar systems are associated with digital signal processing, machine learning and are capable of extracting useful information from high noise levels. Radar is a key technology that the self-driving systems are designed to use, along with sonar and other sensors. Other systems similar to radar make use of other parts of the electromagnetic spectrum. One example is "lidar". With the emergence of driverless vehicles, Radar is expected to assist the automated platform to monitor its environment, thus preventing unwanted incidents.
As early as 1886, German physicist Heinrich Hertz showed that radio waves could be reflected from solid objects. In 1895, Alexander Popov, a physics instructor at the Imperial Russian Navy school in Kronstadt, developed an apparatus using a coherer tube for detecting distant lightning strikes; the next year, he added a spark-gap transmitter. In 1897, while testing this equipment for communicating between two ships in the Baltic Sea, he took note of an interference beat caused by the passage of a third vessel. In his report, Popov wrote that this phenomenon might be used for detecting objects, but he did nothing more with this observation; the German inventor Christian Hülsmeyer was the first to use radio waves to detect "the presence of distant metallic objects". In 1904, he demonstrated the feasibility of detecting a ship in dense fog, but not its distance from the transmitter, he obtained a patent for his detection device in April 1904 and a patent for a related amendment for estimating the distance to the ship.
He got a British patent on September 23, 1904 for a full radar system, that he called a telemobiloscope. It operated on a 50 cm wavelength and the pulsed radar signal was created via a spark-gap, his system used the classic antenna setup of horn antenna with parabolic reflector and was presented to German military officials in practical tests in Cologne and Rotterdam harbour but was rejected. In 1915, Robert Watson-Watt used radio technology to provide advance warning to airmen and during the 1920s went on to lead the U. K. research establishment to make many advances using radio techniques, including the probing of the ionosphere and the detection of lightning at long distances. Through his lightning experiments, Watson-Watt became an expert on the use of radio direction finding before turning his inquiry to shortwave transmission. Requiring a suitable receiver for such studies, he told the "new boy" Arnold Frederic Wilkins to conduct an extensive review of available shortwave units. Wilkins would select a General Post Office model after noting its manual's description of a "fading" effect when aircraft flew overhead.
Across the Atlantic in 1922, after placing a transmitter and receiver on opposite sides of the Potomac River, U. S. Navy researchers A. Hoyt Taylor and Leo C. Young discovered that ships passing through the beam path caused the received signal to fade in and out. Taylor submitted a report, suggesting that this phenomenon might be used to detect the presence of ships in low visibility, but the Navy did not continue the work. Eight years Lawrence A. Hyland at the Naval Research Laboratory observed similar fading effects from passing aircraft. Before the Second World War, researchers in the United Kingdom, Germany, Japan, the Netherlands, the Soviet Union, the United States, independently and in great secrecy, developed technologies that led to the modern version of radar. Australia, New Zealand, South Africa followed prewar Great Britain's radar development, Hungary generated its radar technology during the war. In France in 1934, following systematic studies on the split-anode magnetron, the research branch of the Compagnie Générale de Télégraphie Sans Fil headed by Maurice Ponte with Henri Gutton, Sylvain Berline and M. Hugon, began developing an obstacle-locatin
Carbon is a chemical element with symbol C and atomic number 6. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds, it belongs to group 14 of the periodic table. Three isotopes occur 12C and 13C being stable, while 14C is a radionuclide, decaying with a half-life of about 5,730 years. Carbon is one of the few elements known since antiquity. Carbon is the 15th most abundant element in the Earth's crust, the fourth most abundant element in the universe by mass after hydrogen and oxygen. Carbon's abundance, its unique diversity of organic compounds, its unusual ability to form polymers at the temperatures encountered on Earth enables this element to serve as a common element of all known life, it is the second most abundant element in the human body by mass after oxygen. The atoms of carbon can bond together in different ways, termed allotropes of carbon; the best known are graphite and amorphous carbon. The physical properties of carbon vary with the allotropic form.
For example, graphite is opaque and black while diamond is transparent. Graphite is soft enough to form a streak on paper, while diamond is the hardest occurring material known. Graphite is a good electrical conductor. Under normal conditions, carbon nanotubes, graphene have the highest thermal conductivities of all known materials. All carbon allotropes are solids under normal conditions, with graphite being the most thermodynamically stable form at standard temperature and pressure, they are chemically resistant and require high temperature to react with oxygen. The most common oxidation state of carbon in inorganic compounds is +4, while +2 is found in carbon monoxide and transition metal carbonyl complexes; the largest sources of inorganic carbon are limestones and carbon dioxide, but significant quantities occur in organic deposits of coal, peat and methane clathrates. Carbon forms a vast number of compounds, more than any other element, with ten million compounds described to date, yet that number is but a fraction of the number of theoretically possible compounds under standard conditions.
For this reason, carbon has been referred to as the "king of the elements". The allotropes of carbon include graphite, one of the softest known substances, diamond, the hardest occurring substance, it bonds with other small atoms, including other carbon atoms, is capable of forming multiple stable covalent bonds with suitable multivalent atoms. Carbon is known to form ten million different compounds, a large majority of all chemical compounds. Carbon has the highest sublimation point of all elements. At atmospheric pressure it has no melting point, as its triple point is at 10.8±0.2 MPa and 4,600 ± 300 K, so it sublimes at about 3,900 K. Graphite is much more reactive than diamond at standard conditions, despite being more thermodynamically stable, as its delocalised pi system is much more vulnerable to attack. For example, graphite can be oxidised by hot concentrated nitric acid at standard conditions to mellitic acid, C66, which preserves the hexagonal units of graphite while breaking up the larger structure.
Carbon sublimes in a carbon arc, which has a temperature of about 5800 K. Thus, irrespective of its allotropic form, carbon remains solid at higher temperatures than the highest-melting-point metals such as tungsten or rhenium. Although thermodynamically prone to oxidation, carbon resists oxidation more than elements such as iron and copper, which are weaker reducing agents at room temperature. Carbon is the sixth element, with a ground-state electron configuration of 1s22s22p2, of which the four outer electrons are valence electrons, its first four ionisation energies, 1086.5, 2352.6, 4620.5 and 6222.7 kJ/mol, are much higher than those of the heavier group-14 elements. The electronegativity of carbon is 2.5 higher than the heavier group-14 elements, but close to most of the nearby nonmetals, as well as some of the second- and third-row transition metals. Carbon's covalent radii are taken as 77.2 pm, 66.7 pm and 60.3 pm, although these may vary depending on coordination number and what the carbon is bonded to.
In general, covalent radius decreases with higher bond order. Carbon compounds form the basis of all known life on Earth, the carbon–nitrogen cycle provides some of the energy produced by the Sun and other stars. Although it forms an extraordinary variety of compounds, most forms of carbon are comparatively unreactive under normal conditions. At standard temperature and pressure, it resists all but the strongest oxidizers, it does not react with hydrochloric acid, chlorine or any alkalis. At elevated temperatures, carbon reacts with oxygen to form carbon oxides and will rob oxygen from metal oxides to leave the elemental metal; this exothermic reaction is used in the iron and steel industry to smelt iron and to control the carbon content of steel: Fe3O4 + 4 C → 3 Fe + 4 COCarbon monoxide can be recycled to smelt more iron: Fe3O4 + 4 CO → 3 Fe + 4 CO2with sulfur to form carbon disulfide and with steam in the coal-gas reaction: C + H2O → CO + H2. Carbon combines with some metals at high temperatures to form metallic carbides, such as the iron carbide cementite in steel and tungsten carbide used as an abrasive and for making hard tips for cutting tools.
The system of carbon allotropes spans a range of extremes: Atomic carbon is a ver
Overloon War Museum
The Overloon War Museum is located in Overloon, Netherlands. The museum was opened on May 25th 1946, making it one of the oldest museums in Europe dedicated to the Second World War; the museum is located on the site of the Battle of Overloon, a World War II tank and infantry battle between Allied and German forces that occurred in September and October 1944, in the aftermath of Operation Market Garden. The museum is set in 14 hectares of woodland. A feature of the museum is the large number of military vehicles and equipment on display, both German and Allied. For years these have been kept in the open air, but have been moved indoors in order to help preserve them. Many of the exhibited vehicles took part in the Battle of Overloon. In 2006 the collection was expanded with a large number of vehicles from a private collection. Verzetsmuseum, Amsterdam Overloon War Museum
Treaty of Versailles
The Treaty of Versailles was the most important of the peace treaties that brought World War I to an end. The Treaty ended the state of war between the Allied Powers, it was signed on 28 June 1919 in Versailles five years after the assassination of Archduke Franz Ferdinand, which had directly led to World War I. The other Central Powers on the German side of World War I signed separate treaties. Although the armistice, signed on 11 November 1918, ended the actual fighting, it took six months of Allied negotiations at the Paris Peace Conference to conclude the peace treaty; the treaty was registered by the Secretariat of the League of Nations on 21 October 1919. Of the many provisions in the treaty, one of the most important and controversial required "Germany accept the responsibility of Germany and her allies for causing all the loss and damage" during the war; this article, Article 231 became known as the War Guilt clause. The treaty required Germany to disarm, make ample territorial concessions, pay reparations to certain countries that had formed the Entente powers.
In 1921 the total cost of these reparations was assessed at 132 billion marks. At the time economists, notably John Maynard Keynes, predicted that the treaty was too harsh—a "Carthaginian peace"—and said the reparations figure was excessive and counter-productive, views that, since have been the subject of ongoing debate by historians and economists from several countries. On the other hand, prominent figures on the Allied side such as French Marshal Ferdinand Foch criticized the treaty for treating Germany too leniently; the result of these competing and sometimes conflicting goals among the victors was a compromise that left no one content: Germany was neither pacified nor conciliated, nor was it permanently weakened. The problems that arose from the treaty would lead to the Locarno Treaties, which improved relations between Germany and the other European powers, the re-negotiation of the reparation system resulting in the Dawes Plan, the Young Plan, the indefinite postponement of reparations at the Lausanne Conference of 1932.
Although it is referred to as the "Versailles Conference", only the actual signing of the treaty took place at the historic palace. Most of the negotiations were in Paris, with the "Big Four" meetings taking place at the Quai d'Orsay. On 28 June 1914 the Bosnian-Serbs assassinated the heir to the throne of Austria-Hungary in the name of Serbian nationalism; this caused a escalating July Crisis resulting in Austria-Hungary declaring war on Serbia, followed by the entry of most European powers into First World War. Two alliances faced off, the Triple Entente. Other countries entered as fighting ranged across Europe, as well as the Middle East and Asia. In 1917, two revolutions occurred within the Russian Empire; the new Bolshevik government under Vladimir Lenin in March 1918 signed the Treaty of Brest-Litovsk, favourable to Germany. Sensing victory before American armies could be ready, Germany now shifted forced to the Western Front and tried to overwhelm the Allies, it failed. Instead the Allies won decisively on the battlefield and forced an armistice in November 1918 that resembled a surrender.
On 6 April 1917, the United States entered the war against the Central Powers. The motives were twofold: German submarine warfare against merchant ships trading with France and Britain, which led to the sinking of the RMS Lusitania and the loss of 128 American lives; the American war aim was to detach the war from nationalistic disputes and ambitions after the Bolshevik disclosure of secret treaties between the Allies. The existence of these treaties tended to discredit Allied claims that Germany was the sole power with aggressive ambitions. On 8 January 1918, President Woodrow Wilson issued the Fourteen Points, it outlined a policy of free trade, open agreements, democracy. While the term was not used self-determination was assumed, it called for a negotiated end to the war, international disarmament, the withdrawal of the Central Powers from occupied territories, the creation of a Polish state, the redrawing of Europe's borders along ethnic lines, the formation of a League of Nations to guarantee the political independence and territorial integrity of all states.
It called for a democratic peace uncompromised by territorial annexations. The Fourteen Points were based on the research of the Inquiry, a team of about 150 advisors led by foreign-policy advisor Edward M. House, into the topics to arise in the expected peace conference. After the Central Powers launched Operation Faustschlag on the Eastern Front, the new Soviet Government of Russia signed the Treaty of Brest-Litovsk with Germany on 3 March 1918; this treaty ended the war between Russia and the Central powers and annexed 1,300,000 square miles of territory and 62 million people. This loss equated to a third of the Russian population, a quarter of its territory, around a third of the country's arable land, three-quarters of its coal and iron, a third of its factories, a quarter of its railroads. During the autumn of 1918, the Central Powers began to collapse. Desertion rates within the German army began to increase, civilian strikes drastically reduced