Firedamp Whistle
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Firedamp Whistle
A firedamp whistle (German: ''Schlagwetterpfeife'') is an instrument for the prophylactic indication of firedamp — flammable gases often present in coal mines. History The German Emperor Wilhelm II asked Fritz Haber in 1912, shortly after the opening of the Kaiser Wilhelm Institute for Physical Chemistry and Electrochemistry in Berlin, for the construction of a warning system for the presence of firedamp. Within a year Haber developed the methane whistle and presented it to the emperor in a lecture on October 28, 1913. Haber tried hard to market the device and eventually signed a contract with the Auergesellschaft. Unfortunately, the device did not prevail, since the calibration of the pipes under working conditions in a colliery was not practical. Mode of operation The simultaneous use of two equally-tuned pipes, of which one is blown with atmospheric air and the second with another gas, results in two only slightly different tones, called a beat. The function of t ...
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Firedamp
Firedamp is any flammable gas found in coal mines, typically coalbed methane. It is particularly found in areas where the coal is bituminous. The gas accumulates in pockets in the coal and adjacent strata and when they are penetrated the release can trigger explosions. Historically, if such a pocket was highly pressurized, it was termed a "bag of foulness". Name Damp is the collective name given to all gases (other than air) found in coal mines in Great Britain and North America. As well as firedamp, other damps include ''blackdamp'' (nonbreathable mixture of carbon dioxide, water vapour and other gases); whitedamp (carbon monoxide and other gases produced by combustion); poisonous, explosive ''stinkdamp'' (hydrogen sulfide), with its characteristic rotten-egg odour; and the insidiously lethal ''afterdamp'' (carbon monoxide and other gases) which are produced following explosions of firedamp or coal dust. Etymology Often hyphenated as fire-damp, this term for a flammabl ...
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KWI F Chemie Einweihung
Kuwait International Airport ( ar, مطار الكويت الدولي, ) is an international airport located in the Farwaniya Governorate, Kuwait, south of the centre of Kuwait City, spread over an area of . It serves as the primary hub for Kuwait Airways and Jazeera Airways. A portion of the airport complex is designated as Abdullah Al-Mubarak Air Base, which contains the headquarters of the Kuwait Air Force, as well as the Kuwait Air Force Museum. History The airport was first launched in 1927–1928. It was originally envisioned as a stop for British planes on their way to British India. The current main airport structure, designed by Kenzo Tange and opened in 1979, was executed and completed by Al Hani Construction in a joint venture with Ballast Nedam of The Netherlands. On February 27, 1991, during the final days of the Gulf War, in part of the liberation of Kuwait, the airport became the scene of a tank battle between Iraqi forces and elements of the U.S. Army Special F ...
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Wilhelm II, German Emperor
Wilhelm II (Friedrich Wilhelm Viktor Albert; 27 January 18594 June 1941) was the last German Emperor (german: Kaiser) and King of Prussia, reigning from 15 June 1888 until his abdication on 9 November 1918. Despite strengthening the German Empire's position as a great power by building a powerful navy, his tactless public statements and erratic foreign policy greatly antagonized the international community and are considered by many to be one of the underlying causes of World War I. When the German war effort collapsed after a series of crushing defeats on the Western Front in 1918, he was forced to abdicate, thereby marking the end of the German Empire and the House of Hohenzollern's 300-year reign in Prussia and 500-year reign in Brandenburg. Wilhelm II was the son of Prince Frederick William of Prussia and Victoria, German Empress Consort. His father was the son of Wilhelm I, German Emperor, and his mother was the eldest daughter of Queen Victoria of the United Kingdom and ...
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Fritz Haber
Fritz Haber (; 9 December 186829 January 1934) was a German chemist who received the Nobel Prize in Chemistry in 1918 for his invention of the Haber–Bosch process, a method used in industry to synthesize ammonia from nitrogen gas and hydrogen gas. This invention is important for the large-scale synthesis of fertilisers and explosives. It is estimated that one-third of annual global food production uses ammonia from the Haber–Bosch process, and that this supports nearly half of the world's population. Haber, along with Max Born, proposed the Born–Haber cycle as a method for evaluating the lattice energy of an ionic solid. Haber, a known German nationalist, is also considered the "father of chemical warfare" for his years of pioneering work developing and weaponising chlorine and other poisonous gases during World War I, especially his actions during the Second Battle of Ypres. His work was later also used to develop Zyklon B, used for the murder of more than 1 million of ...
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Berlin
Berlin ( , ) is the capital and largest city of Germany by both area and population. Its 3.7 million inhabitants make it the European Union's most populous city, according to population within city limits. One of Germany's sixteen constituent states, Berlin is surrounded by the State of Brandenburg and contiguous with Potsdam, Brandenburg's capital. Berlin's urban area, which has a population of around 4.5 million, is the second most populous urban area in Germany after the Ruhr. The Berlin-Brandenburg capital region has around 6.2 million inhabitants and is Germany's third-largest metropolitan region after the Rhine-Ruhr and Rhine-Main regions. Berlin straddles the banks of the Spree, which flows into the Havel (a tributary of the Elbe) in the western borough of Spandau. Among the city's main topographical features are the many lakes in the western and southeastern boroughs formed by the Spree, Havel and Dahme, the largest of which is Lake Müggelsee. Due to its l ...
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Auergesellschaft
The industrial firm ''Auergesellschaft'' was founded in 1892 with headquarters in Berlin. Up to the end of World War II, ''Auergesellschaft'' had manufacturing and research activities in the areas of gas mantles, luminescence, rare earths, radioactivity, and uranium and thorium compounds. In 1934, the corporation was acquired by the German corporation Degussa. In 1939, their Oranienburg plant began the development of industrial-scale, high-purity uranium oxide production. Special Soviet search teams, at the close of World War II, sent ''Auergesellschaft'' equipment, material, and staff to the Soviet Union for use in their nuclear weapon project. In 1958 ''Auergesellschaft'' merged with the Mine Safety Appliances Corporation, a multinational US corporation. Auergesellschaft became a limited corporation in 1960. History The ''Deutsche Gasglühlicht AG'' (Degea, German Gas Light Company), was founded in 1892 through the combined efforts of the Jewish entrepreneur and banker Geheimrat ...
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Coal Mining
Coal mining is the process of extracting coal from the ground. Coal is valued for its energy content and since the 1880s has been widely used to generate electricity. Steel and cement industries use coal as a fuel for extraction of iron from iron ore and for cement production. In the United Kingdom and South Africa, a coal mine and its structures are a colliery, a coal mine is called a 'pit', and the above-ground structures are a 'pit head'. In Australia, "colliery" generally refers to an underground coal mine. Coal mining has had many developments in recent years, from the early days of men tunneling, digging and manually extracting the coal on carts to large open-cut and longwall mines. Mining at this scale requires the use of draglines, trucks, conveyors, hydraulic jacks and shearers. The coal mining industry has a long history of significant negative environmental impacts on local ecosystems, health impacts on local communities and workers, and contributes heavily to th ...
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Beat (acoustics)
In acoustics, a beat is an interference pattern between two sounds of slightly different frequencies, ''perceived'' as a periodic variation in volume whose rate is the difference of the two frequencies. With tuning instruments that can produce sustained tones, beats can be readily recognized. Tuning two tones to a unison will present a peculiar effect: when the two tones are close in pitch but not identical, the difference in frequency generates the beating. The volume varies like in a tremolo as the sounds alternately interfere constructively and destructively. As the two tones gradually approach unison, the beating slows down and may become so slow as to be imperceptible. As the two tones get further apart, their beat frequency starts to approach the range of human pitch perception, the beating starts to sound like a note, and a combination tone is produced. This combination tone can also be referred to as a missing fundamental, as the beat frequency of any two tones is equivalen ...
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Speed Of Sound
The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. At , the speed of sound in air is about , or one kilometre in or one mile in . It depends strongly on temperature as well as the medium through which a sound wave is propagating. At , the speed of sound in air is about . The speed of sound in an ideal gas depends only on its temperature and composition. The speed has a weak dependence on frequency and pressure in ordinary air, deviating slightly from ideal behavior. In colloquial speech, ''speed of sound'' refers to the speed of sound waves in air. However, the speed of sound varies from substance to substance: typically, sound travels most slowly in gases, faster in liquids, and fastest in solids. For example, while sound travels at in air, it travels at in water (almost 4.3 times as fast) and at in iron (almost 15 times as fast). In an exceptionally stiff material such as diamond, sound travels a ...
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Methane
Methane ( , ) is a chemical compound with the chemical formula (one carbon atom bonded to four hydrogen atoms). It is a group-14 hydride, the simplest alkane, and the main constituent of natural gas. The relative abundance of methane on Earth makes it an economically attractive fuel, although capturing and storing it poses technical challenges due to its gaseous state under normal conditions for temperature and pressure. Naturally occurring methane is found both below ground and under the seafloor and is formed by both geological and biological processes. The largest reservoir of methane is under the seafloor in the form of methane clathrates. When methane reaches the surface and the atmosphere, it is known as atmospheric methane. The Earth's atmospheric methane concentration has increased by about 150% since 1750, and it accounts for 20% of the total radiative forcing from all of the long-lived and globally mixed greenhouse gases. It has also been detected on other plane ...
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Mine Safety
Mine safety is a broad term referring to the practice of controlling and managing a wide range of hazards associated with the life cycle of mining-related activities. Mine safety practice involves the implementation of recognised hazard controls and/or reduction of risks associated with mining activities to legally, socially and morally acceptable levels. While the fundamental principle of mine safety is to remove health and safety risks to mine workers, mining safety practice may also focus on the reduction of risks to plant (machinery) together with the structure and orebody of the mine. Safety has long been a concern in the mining business, especially in underground mining. The Courrières mine disaster, Europe's worst mining accident, involved the death of 1,099 miners in Northern France on March 10, 1906. This disaster was surpassed only by the Benxihu Colliery accident in China on April 26, 1942, which killed 1,549 miners. While mining today is substantially safer than it was ...
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