1.
Nazi Germany
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Nazi Germany is the common English name for the period in German history from 1933 to 1945, when Germany was governed by a dictatorship under the control of Adolf Hitler and the Nazi Party. Under Hitlers rule, Germany was transformed into a fascist state in which the Nazi Party took totalitarian control over all aspects of life. The official name of the state was Deutsches Reich from 1933 to 1943, the period is also known under the names the Third Reich and the National Socialist Period. The Nazi regime came to an end after the Allied Powers defeated Germany in May 1945, Hitler was appointed Chancellor of Germany by the President of the Weimar Republic Paul von Hindenburg on 30 January 1933. The Nazi Party then began to eliminate all opposition and consolidate its power. Hindenburg died on 2 August 1934, and Hitler became dictator of Germany by merging the powers and offices of the Chancellery, a national referendum held 19 August 1934 confirmed Hitler as sole Führer of Germany. All power was centralised in Hitlers person, and his word became above all laws, the government was not a coordinated, co-operating body, but a collection of factions struggling for power and Hitlers favour. In the midst of the Great Depression, the Nazis restored economic stability and ended mass unemployment using heavy military spending, extensive public works were undertaken, including the construction of Autobahnen. The return to economic stability boosted the regimes popularity, racism, especially antisemitism, was a central feature of the regime. The Germanic peoples were considered by the Nazis to be the purest branch of the Aryan race, millions of Jews and other peoples deemed undesirable by the state were murdered in the Holocaust. Opposition to Hitlers rule was ruthlessly suppressed, members of the liberal, socialist, and communist opposition were killed, imprisoned, or exiled. The Christian churches were also oppressed, with many leaders imprisoned, education focused on racial biology, population policy, and fitness for military service. Career and educational opportunities for women were curtailed, recreation and tourism were organised via the Strength Through Joy program, and the 1936 Summer Olympics showcased the Third Reich on the international stage. Propaganda minister Joseph Goebbels made effective use of film, mass rallies, the government controlled artistic expression, promoting specific art forms and banning or discouraging others. Beginning in the late 1930s, Nazi Germany made increasingly aggressive territorial demands and it seized Austria and Czechoslovakia in 1938 and 1939. Hitler made a pact with Joseph Stalin and invaded Poland in September 1939. In alliance with Italy and smaller Axis powers, Germany conquered most of Europe by 1940, reichskommissariats took control of conquered areas, and a German administration was established in what was left of Poland. Jews and others deemed undesirable were imprisoned, murdered in Nazi concentration camps and extermination camps, following the German invasion of the Soviet Union in 1941, the tide gradually turned against the Nazis, who suffered major military defeats in 1943
2.
Deutsche Werft
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Deutsche Werft was a shipbuilding company in Finkenwerder, Hamburg, Germany. It was founded in 1918 by Albert Ballin and with Gutehoffnungshütte, Allgemeine Elektricitäts-Gesellschaft, in peacetime, Deutsche Werft built merchant ships, such as the HAPAG turbo-electric cargo ships Antilla and Orizaba. In World War II Deutsche Werft built 113 Type IX and XXIII U-boats for the Kriegsmarine, in 1968 Deutsche Werft was merged and became part of Howaldtswerke-Deutsche Werft
3.
Hamburg
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Hamburg, officially Freie und Hansestadt Hamburg, is the second largest city in Germany and the eighth largest city in the European Union. It is the second smallest German state by area and its population is over 1.7 million people, and the wider Hamburg Metropolitan Region covers more than 5.1 million inhabitants. The city is situated on the river Elbe, the official long name reflects Hamburgs history as a member of the medieval Hanseatic League, a free imperial city of the Holy Roman Empire, a city-state, and one of the 16 states of Germany. Before the 1871 Unification of Germany, it was a sovereign state. Prior to the changes in 1919, the civic republic was ruled by a class of hereditary grand burghers or Hanseaten. Though repeatedly destroyed by the Great Fire of Hamburg, the floods and military conflicts including WW2 bombing raids, the city managed to recover and emerge wealthier after each catastrophe. On the river Elbe, Hamburg is a port and a global service, media, logistics and industrial hub, with headquarters and facilities of Airbus, Blohm + Voss, Aurubis, Beiersdorf. The radio and television broadcaster NDR, Europes largest printing and publishing firm Gruner + Jahr, Hamburg has been an important financial centre for centuries, and is the seat of Germanys oldest stock exchange and the worlds second oldest bank, Berenberg Bank. The city is a fast expanding tourist destination for domestic and international visitors. It ranked 16th in the world for livability in 2015, the ensemble Speicherstadt and Kontorhausviertel was declared a World Heritage Site by the UNESCO in 2015. Hamburg is a major European science, research and education hub with several universities and institutes and its creative industries and major cultural venues include the renowned Elbphilharmonie and Laeisz concert halls, various art venues, music producers and artists. It is regarded as a haven for artists, gave birth to movements like Hamburger Schule. Hamburg is also known for theatres and a variety of musical shows. St. Paulis Reeperbahn is among the best known European entertainment districts, Hamburg is on the southern point of the Jutland Peninsula, between Continental Europe to the south and Scandinavia to the north, with the North Sea to the west and the Baltic Sea to the north-east. It is on the River Elbe at its confluence with the Alster, the city centre is around the Binnenalster and Außenalster, both formed by damming the River Alster to create lakes. The island of Neuwerk and two neighbouring islands Scharhörn and Nigehörn, in the Hamburg Wadden Sea National Park, are also part of Hamburg. The neighbourhoods of Neuenfelde, Cranz, Francop and Finkenwerder are part of the Altes Land region, neugraben-Fischbek has Hamburgs highest elevation, the Hasselbrack at 116.2 metres AMSL. Hamburg has a climate, influenced by its proximity to the coast
4.
United States Navy
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The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U. S. Navy is the largest, most capable navy in the world, the U. S. Navy has the worlds largest aircraft carrier fleet, with ten in service, two in the reserve fleet, and three new carriers under construction. The service has 323,792 personnel on duty and 108,515 in the Navy Reserve. It has 274 deployable combat vessels and more than 3,700 operational aircraft as of October 2016, the U. S. Navy traces its origins to the Continental Navy, which was established during the American Revolutionary War and was effectively disbanded as a separate entity shortly thereafter. It played a role in the American Civil War by blockading the Confederacy. It played the role in the World War II defeat of Imperial Japan. The 21st century U. S. Navy maintains a global presence, deploying in strength in such areas as the Western Pacific, the Mediterranean. The Navy is administratively managed by the Department of the Navy, the Department of the Navy is itself a division of the Department of Defense, which is headed by the Secretary of Defense. The Chief of Naval Operations is an admiral and the senior naval officer of the Department of the Navy. The CNO may not be the highest ranking officer in the armed forces if the Chairman or the Vice Chairman of the Joint Chiefs of Staff. The mission of the Navy is to maintain, train and equip combat-ready Naval forces capable of winning wars, deterring aggression, the United States Navy is a seaborne branch of the military of the United States. The Navys three primary areas of responsibility, The preparation of naval forces necessary for the prosecution of war. The development of aircraft, weapons, tactics, technique, organization, U. S. Navy training manuals state that the mission of the U. S. Armed Forces is to prepare and conduct prompt and sustained combat operations in support of the national interest, as part of that establishment, the U. S. Navys functions comprise sea control, power projection and nuclear deterrence, in addition to sealift duties. It follows then as certain as that night succeeds the day, that without a decisive naval force we can do nothing definitive, the Navy was rooted in the colonial seafaring tradition, which produced a large community of sailors, captains, and shipbuilders. In the early stages of the American Revolutionary War, Massachusetts had its own Massachusetts Naval Militia, the establishment of a national navy was an issue of debate among the members of the Second Continental Congress. Supporters argued that a navy would protect shipping, defend the coast, detractors countered that challenging the British Royal Navy, then the worlds preeminent naval power, was a foolish undertaking. Commander in Chief George Washington resolved the debate when he commissioned the ocean-going schooner USS Hannah to interdict British merchant ships, and reported the captures to the Congress
5.
Museum ship
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A museum ship, also called a memorial ship, is a ship that has been preserved and converted into a museum open to the public for educational or memorial purposes. Some are also used for training and recruitment purposes, mostly for the number of museum ships that are still operational. Many, if not most, museum ships are also associated with a maritime museum, only a few survive, sometimes because of historical significance, but more often due to luck and circumstance. The restoration and maintenance of museum ships presents problems for historians who are asked for advice, for instance, the rigging of sailing ships has almost never survived, and so the rigging plan must be reconstructed from various sources. Studying the ships also allows historians to analyze how life on and operation of the ships took place, numerous scientific papers have been written on ship restoration and maintenance, and international conferences are held discussing the latest developments. Another consideration is the distinction between a museum ship, and a ship replica. As repairs accumulate over time, less and less of the ship is of the materials. Visitors without historical background are often unable to distinguish between a historical museum ship and a ship replica, which may serve solely as a tourist attraction. Typically the visitor enters via gangplank, wanders around on the deck, then goes below, usually using the original stairways, giving a sense of how the crew got around. The interior features restored but inactivated equipment, enhanced with mementos including old photographs, explanatory displays, pages from the logs, menus. Some add recorded sound effects, audio tours or video displays to enhance the experience, in some cases, the ships radio room has been brought back into use, with volunteers operating amateur radio equipment. Often, the callsign assigned is a variation on the identification of the ship. For example, the submarine USS Cobia, which had the call NBQV, is now on the air as NB9QV. The World War II submarine USS Pampanito, berthed at the San Francisco Maritime National Historical Park, had the wartime call NJVT and is now on the air as NJ6VT, in other cases, such as the USS Missouri, a distinctive call is used. This radio work not only helps restore part of the vessel, a number of the larger museum ships have begun to offer hosting for weddings, meetings, other events, and sleepovers, and on a few ships still seaworthy, cruises. In the United States, this includes the USS Constitutions annual turnaround, a place on the deck is by invitation or lottery only, and highly prized. Many consider the appeal of an interesting old vessel on the city waterfront strong enough that any port city should showcase one or more museum ships. This may even include building a ship at great expense
6.
German Type IX submarine
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The Type IX U-boat was designed by Nazi Germanys Kriegsmarine in 1935 and 1936 as a large ocean-going submarine for sustained operations far from the home support facilities. Type IX boats were used for patrols off the eastern United States in an attempt to disrupt the stream of troops. It was derived from the Type IA, and appeared in various sub-types, Type IXs had six torpedo tubes, four at the bow and two at the stern. They carried six reloads internally and had five external torpedo containers which stored ten additional torpedoes, the total of 22 torpedoes allowed U-boat commanders to follow a convoy and strike night after night. Some of the IXC boats were fitted for operations, as mine-layers they could carry 44 TMA or 66 TMB mines. Secondary armament was provided by one 10.5 cm deck gun with 180 rounds, anti-aircraft armament differed throughout the war. They had two periscopes in the tower, types IXA and IXB had an additional periscope in the control room, which was removed in Type IXC and afterward. DeSchiMAG AG Weser of Bremen built eight Type IXA U-boats, Type IXB was an improved model with an increased range. It was the most successful version overall with each boat averaging a total of over 100,000 GRT sunk, DeSchiMAG AG Weser of Bremen built 14 Type IXB U-boats. Type IXC was a refinement of the class with storage for an additional 43 tonnes of fuel. This series omitted the control room periscope leaving the boats with two tower scopes, as mine-layers they could carry 44 TMA or 66 TMB mines, though U-162 through U-170 and U-505 through U-550, were not fitted for mine operations. The only U-boat sunk in the Gulf of Mexico, U-166, was a Type IXC, U-505 survives at the Museum of Science and Industry in Chicago, and as of 2005 has been completely renovated. DeSchiMAG AG Weser and Seebeckwerft of Bremen, and Deutsche Werft of Hamburg built 54 Type IXC submarines, Type IXC/40 was an improved Type IXC with slightly increased range and surfaced speed. The remains of U-534 are on display at Woodside Ferry Terminal, DeSchiMAG AG Weser and Seebeckwerft of Bremen, and Deutsche Werft of Hamburg, built 87 of this type. Type IXD was significantly longer and heavier than the IXC/40 and it was faster than the IXC but at the cost of slightly reduced range. They had three pairs of Daimler Benz diesels, two pairs for cruise and one for speed or battery recharge. There were three variants, the IXD1, IXD2 and IXD/42, the IXD1 had unreliable engines and they were later converted for use in surface transport vessels. The IXD2 comprised most of the class and had a range of 12,750 nautical miles, the IXD/42, was almost identical but with more engine power
7.
Submarine
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A submarine is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability, the term most commonly refers to a large, crewed vessel. It is also used historically or colloquially to refer to remotely operated vehicles and robots, as well as medium-sized or smaller vessels, such as the midget submarine. The noun submarine evolved as a form of submarine boat, by naval tradition, submarines are usually referred to as boats rather than as ships. Although experimental submarines had been built before, submarine design took off during the 19th century, Submarines were first widely used during World War I, and now figure in many navies large and small. Civilian uses for submarines include marine science, salvage, exploration and facility inspection, Submarines can also be modified to perform more specialized functions such as search-and-rescue missions or undersea cable repair. Submarines are also used in tourism, and for undersea archaeology, most large submarines consist of a cylindrical body with hemispherical ends and a vertical structure, usually located amidships, which houses communications and sensing devices as well as periscopes. In modern submarines, this structure is the sail in American usage, a conning tower was a feature of earlier designs, a separate pressure hull above the main body of the boat that allowed the use of shorter periscopes. There is a propeller at the rear, and various hydrodynamic control fins, smaller, deep-diving and specialty submarines may deviate significantly from this traditional layout. Submarines use diving planes and also change the amount of water, Submarines have one of the widest ranges of types and capabilities of any vessel. Submarines can work at greater depths than are survivable or practical for human divers, modern deep-diving submarines derive from the bathyscaphe, which in turn evolved from the diving bell. In 1578, the English mathematician William Bourne recorded in his book Inventions or Devises one of the first plans for an underwater navigation vehicle and its unclear whether he ever carried out his idea. The first submersible of whose construction there exists reliable information was designed and built in 1620 by Cornelis Drebbel and it was propelled by means of oars. By the mid-18th century, over a dozen patents for submarines/submersible boats had been granted in England, in 1747, Nathaniel Symons patented and built the first known working example of the use of a ballast tank for submersion. His design used leather bags that could fill with water to submerge the craft, a mechanism was used to twist the water out of the bags and cause the boat to resurface. In 1749, the Gentlemens Magazine reported that a design had initially been proposed by Giovanni Borelli in 1680. By this point of development, further improvement in design stagnated for over a century, until new industrial technologies for propulsion. The first military submarine was the Turtle, a hand-powered acorn-shaped device designed by the American David Bushnell to accommodate a single person and it was the first verified submarine capable of independent underwater operation and movement, and the first to use screws for propulsion
8.
Length overall
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Length overall, often abbreviated as is the maximum length of a vessels hull measured parallel to the waterline. This length is important while docking the ship and it is the most commonly used way of expressing the size of a ship, and is also used for calculating the cost of a marina berth. LOA is usually measured on the hull alone, for sailing ships, this may exclude the bowsprit and other fittings added to the hull. This is how some racing boats and tall ships use the term LOA, however, other sources may include bowsprits in LOA. Sparred length, Total length including bowsprit, Mooring length and LOA including bowsprit are other expressions that might indicate the length of a sailing ship. Often used to distinguish between the length of a vessel including projections from the length of the hull itself, the Length on Deck or LOD is often reported and this is especially useful for smaller sailing vessels, as their LOA can be significantly different from their LOD. In ISO8666 for small boats, there is a definition of LOH and this may be shorter than a vessels LOA, because it excludes other parts attached to the hull, such as bowsprits. Another measure of length is LWL which is useful in assessing a vessels performance. In some cases LWL can be shorter than LOA. Overall length in cartridges The National Register of Historic Vessels Length between perpendiculars Hayler, William B, keever, John M. American Merchant Seamans Manual. Turpin, Edward A. McEwen, William A
9.
Submarine hull
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A light hull of a submarine is the outer non-watertight hull which provides a hydrodynamically efficient shape. The pressure hull is the hull of a submarine, this holds the difference between outside and inside pressure. This design, already visible on very early submarines is called a teardrop hull and it significantly reduces the hydrodynamic drag on the sub when submerged, but decreases the sea-keeping capabilities and increases the drag while surfaced. Because of the slow submerged speeds of these submarines, usually well below 10 knots, USS Albacore was a unique research submarine that pioneered the American version of the teardrop hull form of modern submarines. All small modern submarines and submersibles, as well as the oldest ones, have a single hull, however, for large submarines, the approaches have separated. All Soviet heavy submarines are built with a hull structure. The double hull of a submarine is different from a double hull. The external hull, which forms the shape of submarine, is called the outer hull. This term is appropriate for Russian submarine construction, where the light hull is usually made of steel that is only 2 to 4 millimetres thick. The light hull can be used to mount equipment, which if attached directly to the hull could cause unnecessary stress. The double hull approach also saves space inside the hull, as the ring stiffeners. These measures help minimise the size of the hull, which is much heavier than the light hull. Also, in case the submarine is damaged, the light hull takes some of the damage and does not compromise the vessels integrity, inside the outer hull there is a strong hull, or pressure hull, which actually withstands the outside pressure and has normal atmospheric pressure inside. The pressure hull is constructed of thick high-strength steel with a complex structure and high strength reserve. The pressure and light hulls arent separated, and form a structure with increased strength. The interhull space is used for some of the equipment which doesnt require constant pressure to operate, the list significantly differs between submarines, and generally includes different water/air tanks. In case of a submarine, the light hull and the pressure hull are the same except for the bow. The constructions of a pressure hull requires a degree of precision
10.
Diesel engine
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Diesel engines work by compressing only the air. This increases the air temperature inside the cylinder to such a degree that it ignites atomised diesel fuel that is injected into the combustion chamber. This contrasts with spark-ignition engines such as an engine or gas engine. In diesel engines, glow plugs may be used to aid starting in cold weather, or when the engine uses a lower compression-ratio, the original diesel engine operates on the constant pressure cycle of gradual combustion and produces no audible knock. Low-speed diesel engines can have an efficiency that exceeds 50%. Diesel engines may be designed as either two-stroke or four-stroke cycles and they were originally used as a more efficient replacement for stationary steam engines. Since the 1910s they have used in submarines and ships. Use in locomotives, trucks, heavy equipment and electricity generation plants followed later, in the 1930s, they slowly began to be used in a few automobiles. Since the 1970s, the use of engines in larger on-road and off-road vehicles in the US increased. According to the British Society of Motor Manufacturing and Traders, the EU average for diesel cars accounts for 50% of the total sold, including 70% in France and 38% in the UK. The worlds largest diesel engine is currently a Wärtsilä-Sulzer RTA96-C Common Rail marine diesel, the definition of a Diesel engine to many has become an engine that uses compression ignition. To some it may be an engine that uses heavy fuel oil, to others an engine that does not use spark ignition. However the original cycle proposed by Rudolf Diesel in 1892 was a constant temperature cycle which would require higher compression than what is needed for compression ignition. Diesels idea was to compress the air so tightly that the temperature of the air would exceed that of combustion, to make this more clear, let it be assumed that the subsequent combustion shall take place at a temperature of 700°. Then in that case the pressure must be sixty-four atmospheres, or for 800° centigrade the pressure must be ninety atmospheres. In later years Diesel realized his original cycle would not work, Diesel describes the cycle in his 1895 patent application. Notice that there is no longer a mention of compression temperatures exceeding the temperature of combustion, now all that is mentioned is the compression must be high enough for ignition. In 1806 Claude and Nicéphore Niépce developed the first known internal combustion engine, the Pyréolophore fuel system used a blast of air provided by a bellows to atomize Lycopodium
11.
Nautical mile
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A nautical mile is a unit of measurement defined as exactly 1852 meters. Historically, it was defined as one minute of latitude, which is equivalent to one sixtieth of a degree of latitude. Today it is an SI derived unit, being rounded to a number of meters. The derived unit of speed is the knot, defined as one mile per hour. The geographical mile is the length of one minute of longitude along the Equator, there is no internationally agreed symbol. M is used as the abbreviation for the mile by the International Hydrographic Organization and by the International Bureau of Weights. NM is used by the International Civil Aviation Organization, nm is used by the U. S. National Oceanic and Atmospheric Administration. Nmi is used by the Institute of Electrical and Electronics Engineers, the word mile is from the Latin word for a thousand paces, mīlia. In 1617 the Dutch scientist Snell assessed the circumference of the Earth at 24,630 Roman miles, around that time British mathematician Edmund Gunter improved navigational tools including a new quadrant to determine latitude at sea. He reasoned that the lines of latitude could be used as the basis for a unit of measurement for distance, as one degree is 1/360 of a circle, one minute of arc is 1/21600 of a circle. These sexagesimal units originated in Babylonian astronomy, Gunter used Snells circumference to define a nautical mile as 6,080 feet, the length of one minute of arc at 48 degrees latitude.3 metres. Other countries measure the minute of arc at 45 degrees latitude, in 1929, the international nautical mile was defined by the First International Extraordinary Hydrographic Conference in Monaco as 1,852 meters. Imperial units and United States customary units used a definition of the nautical mile based on the Clarke Spheroid, the United States nautical mile was defined as 6,080.20 feet based in the Mendenhall Order foot of 1893. It was abandoned in favour of the nautical mile in 1954.181 meters. It was abandoned in 1970 and, legally, references to the unit are now converted to 1,853 meters. Conversion of units Orders of magnitude
12.
Torpedo tube
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A torpedo tube is a cylinder shaped device for launching torpedoes. There are two types of torpedo tube, underwater tubes fitted to submarines and some surface ships. Thus a submarine torpedo tube operates on the principle of an airlock, the diagram on the right illustrates the operation of a submarine torpedo tube. The diagram is somewhat simplified but does show the working of a torpedo launch. A torpedo tube has a number of interlocks for safety reasons. For example, an interlock prevents the door and muzzle door from opening at the same time. The submarine torpedo launch sequence is, in simplified form, Open the breech door in the torpedo room, load the torpedo into the tube. Hook up the connection and the torpedo power cable. Shut and lock the breech door, turn on power to the torpedo. A minimum amount of time is required for torpedo warmup, fire control programs are uploaded to the torpedo. This may be manually or automatically, from sea or from tanks. The tube must be vented during this process to allow for complete filling, Open the equalizing valve to equalize pressure in the tube with ambient sea pressure. If the tube is set up for Impulse Mode the slide valve will open with the muzzle door, if Swim Out Mode is selected, the slide valve remains closed. The slide valve allows water from the pump to enter the tube. Modern torpedoes have a safety mechanism that prevents activation of the torpedo unless the torpedo senses the required amount of G-force, the power cable is severed at launch. However, if a wire is used, it remains connected through a drum of wire in the tube. Torpedo propulsion systems vary but electric torpedoes swim out of the tube on their own and are of a smaller diameter,21 weapons with fuel-burning engines usually start outside of the tube. Once outside the tube the torpedo begins its run toward the target as programmed by the control system
13.
Torpedo
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Historically, it was called an automotive, automobile, locomotive or fish torpedo, colloquially called a fish. The term torpedo was originally employed for a variety of devices, from about 1900, torpedo has been used strictly to designate an underwater self-propelled weapon. Todays torpedoes can be divided into lightweight and heavyweight classes, and into straight-running, autonomous homers and they can be launched from a variety of platforms. The word torpedo comes from the name of a genus of rays in the order Torpediniformes. In naval usage, the American Robert Fulton introduced the name to refer to a gunpowder charge used by his French submarine Nautilus to demonstrate that it could sink warships. The concept of a torpedo existed many centuries before it was successfully developed. In 1275, Hasan al-Rammah described. an egg which moves itself, in modern language, a torpedo is an underwater self-propelled explosive, —but historically, the term also applied to primitive naval mines. These were used on an ad hoc basis during the modern period up to the late 19th century. An early submarine, the Turtle, attempted to lay a bomb with a fuse on the hull of HMS Eagle during the American Revolutionary War. In the early 1800s, the American inventor Robert Fulton, while in France and he coined the term torpedo in reference to the explosive charges he outfitted his submarine Nautilus. However, both the French and the Dutch governments were uninterested in the submarine, Fulton then concentrated on developing the torpedo independent of a submarine deployment. However, the British government refused to purchase the invention, stating they did not wish to introduce into naval warfare a system that would give advantage to weaker maritime nations. Fulton carried out a demonstration for the US government on 20 July 1807. Further development languished as Fulton focused on his steam-boat matters, during the War of 1812, torpedoes were employed in attempts to destroy British vessels and protect American harbors. In fact a submarine deployed torpedo was used in an attempt to destroy HMS Ramillies while in New Londons harbor. Hardy to warn the Americans to cease efforts with the use of any boat in this cruel and unheard-of warfare. Torpedoes were used by the Russian Empire during the Crimean War in 1855 against British warships in the Gulf of Finland and they used an early form of chemical detonator. During the American Civil War, the torpedo was used for what is today called a contact mine
14.
10.5 cm SK C/32 naval gun
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The 10.5 cm SK C/32 (SK - Schnelladekanone C - Construktionsjahr, was a widely used German naval gun on a variety of Kriegsmarine ships during World War II. Originally designed as a weapon it was used in a number of other roles such as anti-aircraft, coastal defence. The 10.5 cm SK C/32 was a gun,45 calibers long, with a jacket. The gun fired 10.5 centimeters fixed ammunition, which was 1.51 metres long, useful life expectancy was 4,100 effective full charges per barrel. The 10.5 cm SK C/32 was widely deployed on three different types of single mounts, the high-angle MPLC/30 was a modified 8.8 cm mount. The low-angle MPLC/32 was used on Type 35 torpedo boats, Type 37 torpedo boats, f-boats, the high-angle MPLC/32 gE was used on the cruiser Emden, the battleship Schlesien, the battleship Schleswig-Holstein, Type 39 torpedo boats, Type 35 minesweepers and Type 43 minesweepers. The 10.5 cm SK C/32 was the standard deck gun mounted forward of the conning tower in type I, type IX. The Ubts LC/32 mounting used in type I and early type IX U-boats weighed about 5 tonnes, later type IX and type XB U-boats used the lighter Ubts LC/36 mounting with a maximum elevation of +30°. During the early war years, these guns were used to encourage surrender of independently routed merchant ships or to sink ships damaged by torpedoes, norway used this gun in coastal defence batteries until 2002. List of naval guns QF4 inch Mk XII & Mk XXII guns, Slightly less powerful British equivalent submarine guns Blair, hitlers U-Boat War, The Hunters 1939-1942. Naval Weapons of World War Two, German Warships of the Second World War. Tony DiGiulian, Germany 10.5 cm/45 SK C/32
15.
Deck gun
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Deck gun can also mean a type of big water nozzle used for firefighting. A deck gun is a type of artillery mounted on the deck of a submarine. Similar unenclosed guns are often found on ships as secondary or defensive armament. Most submarine deck guns were open, however a few larger submarines placed these guns in a turret, the deck gun was used as a defensive weapon against smaller boats or ships and in certain cases where torpedo use was limited. Typically a crew of three, gunner, loader and layer, operated the gun, while others were tasked with supplying ammunition, a small locker box held a few ready-use rounds. With a well-drilled, experienced crew, the rate of fire of a gun could be 15 to 18 aimed shots per minute. The deck gun was introduced in all submarine forces prior to World War I, although technically not a deck gun, USS Holland, the first American submarine, was equipped with a pneumatic dynamite gun built into the bow in 1900. The deck gun was first used by the Germans in World War I, lothar von Arnauld de la Perière used a deck gun or a dynamiting team on 171 of his 194 sinkings. In early World War II, German submarine commanders favored the deck gun because of the unreliability of torpedoes, the deck gun became less effective as convoys became larger and better equipped, and merchant ships were armed. Surfacing also became dangerous in the vicinity of a convoy because of improvements in radar, German U-boat deck guns were eventually removed on the order of the supreme commander of the U-boat Arm during World War II, and those deck guns that remained were no longer manned. Two notable deck guns from German U-boats used in World War II were the 8.8 cm SK C/35, the 88 mm had ammunition that weighed about 30 lb and was of the projectile and cartridge type. It had the controls on both sides of the gun so that the two crewmen that were in charge of firing it could control the gun from either side. The 105 mm evolved from the 88 mm in the sense that it was accurate and had more power due to the 51 lb ammunition it fired. In the US Navy, deck guns were used through the end of World War II, many targets in the Pacific War were sampans or other small vessels that were not worth a torpedo. The unreliability of the Mark 14 torpedo through mid-1943 also promoted the use of the deck gun, most US submarines started the war with a single 3 inch /50 caliber deck gun, adopted in the 1930s to discourage commanders from engaging heavily-armed escorts. However, the aging S-boats were equipped with a 4 inch /50 caliber gun, by 1944 most front-line submarines had been refitted with a 5 inch /25 caliber gun, and some were equipped with two 5 inch guns. The USS Argonaut, Narwhal and Nautilus were each fitted with two 6/53 caliber guns Mark 18, the largest deck gun to be fitted on any United States submarine. Japanese submarine cruisers used 14 cm/40 11th Year Type naval guns to shell California, British Columbia, the French submarine Surcouf was launched in 1929 with two 203mm/50 Modèle 1924 guns in a turret forward of the conning tower
16.
3.7 cm SK C/30
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The 3.7 cm SK C/30 was the German Kriegsmarines primary 3.7 cm anti-aircraft gun during the Second World War. It was superseded by the fully automatic 3.7 cm FlaK43 late in the war and its muzzle velocity was on the other hand far superior, which greatly eased the aiming. The SK C/30U gun was modified for use by submarines, All mountings were suitable for use against both air and soft surface targets. The Doppellafette C/30 was a mount with each gun in a separate cradle. It had a crew on the mount itself plus additional ammunition handlers. The mounting was manually traversed and elevated and was gyro-stabilized up to a limit of 19. 5° degrees to counteract the roll, most German ships, fleet torpedo boat or larger, carried at least one Dopp L C/30 mounting. The Einheitslafette C/34 was a gun mounted on a pedestal with a two-man crew. Some mounts were fitted with a 8 millimetres gun shield and it was used on the smaller Kriegsmarine ships like the Schnellboot. A number were used on land to supplement the anti-aircraft defenses of ports, the Ubts L C/39 submarine mount used the SK C/30U gun. It was a pedestal mount with a two-man crew, one of whom trained the gun with the shoulder stirrup. The SK C/30 used two types of tracer rounds. The 3.7 cm Br Sprgr Patr 40 L/4.1 Lh 37M was a round with an incendiary filling while the 3.7 cm Sprgr Patr 40 L/4.1 Lh 37 lacked the incendiary fill. Tracers were available in red, yellow or white and were marked on the shell by a band of the appropriate color. A complete round weighed 1.78 kilograms, naval Weapons of World War Two. Weapons of the Third Reich, An Encyclopedic Survey of All Small Arms, Artillery, hogg, Ian V. German Artillery of World War Two. Leichte und mittlere Artillerie auf deutschen Kriegsschiffen
17.
2 cm Flak 30/38/Flakvierling
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The Flak 30 and improved Flak 38 were 20 mm anti-aircraft guns used by various German forces throughout World War II. It was not only the primary German light anti-aircraft gun, and it was produced in a variety of models, notably the Flakvierling 38 which combined four Flak 38 autocannons onto a single carriage. The Germans fielded the unrelated early 2 cm Flak 28 just after World War I, the original Flak 30 design was developed from the Solothurn ST-5 as a project for the Kriegsmarine, which produced the 20 mm C/30. The gun fired the Long Solothurn, a 20 ×138 mm belted cartridge that had developed for the ST-5 and was one of the most powerful 20 mm rounds in existence. The C/30, featuring a length of 65 calibres, had a rate of about 120 rounds per minute. Disappointingly, it proved to have feeding problems and would often jam, nevertheless, the C/30 became the primary shipborne light AA weapon and equipped a large variety of German ships. Rheinmetall then started an adaptation of the C/30 for Army use, generally similar to the C/30, the main areas of development were the mount, which was fairly compact. Set-up could be accomplished by dropping the gun to the ground off its two-wheeled carriage, the result was a triangular base that allowed fire in all directions. But the main problem with the design remained unsolved, the rate of fire of 120 RPM was not particularly fast for a weapon of this calibre. Rheinmetall responded with the 2 cm Flak 38, which was similar but increased the rate of fire to 220 RPM. The Flak 38 was accepted as the standard Army gun in 1939, in order to provide airborne and mountain troops with AA capabilities, Mauser was contracted to produce a lighter version of the Flak 38, which they introduced as the 2 cm Gebirgsflak 38. It featured a dramatically simplified mount using a tripod that raised the gun off the ground. These changes reduced the weight of the gun to a mere 276.0 kg. Production started in 1941 and entered service in 1942, a wide variety of 20x138B ammunition was manufactured to be used in 2 cm Flak weapons, some of the more commonly used types are listed on the following table. Other kinds than in existence included numerous practice rounds and a number of different AP types, a high-velocity PzGr 40 round with a tungsten carbide core in an aluminium body existed in 20x138B caliber. This meant it could keep enemy aircraft under fire over longer time spans, the 20 mm weapons had always had weak development perspectives, often being reconfigured or redesigned just enough to allow the weapons to find use. Indeed, it came as a surprise when Rheinmetall introduced the 2 cm Flakvierling 38, the term Vierling literally translates to quadruplet and refers to the four 20 mm gun constituting the design. The Flakvierling weapon consisted of quad-mounted 2 cm Flak 38 AA guns with collapsing seats, folding handles, the mount had a triangular base with a jack at each leg for levelling the gun
18.
Kriegsmarine
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The Kriegsmarine was the navy of Nazi Germany from 1935 to 1945. It superseded the Imperial German Navy of the German Empire and the inter-war Reichsmarine, the Kriegsmarine was one of three official branches—along with the Heer and the Luftwaffe —of the Wehrmacht, the armed forces of Nazi Germany. The Kriegsmarine grew rapidly during German naval rearmament in the 1930s, Kriegsmarine ships were deployed to the waters around Spain during the Spanish Civil War, under the guise of enforcing non-intervention, but in reality supporting the Franco side of the war. In January 1939 Plan Z was ordered, calling for naval parity with the Royal Navy by 1944, however, when World War II broke out in September 1939, Plan Z was shelved in favour of building submarines and prioritizing land and air forces. The Commander-in-Chief of the Kriegsmarine was Adolf Hitler, who exercised his authority through the Oberkommando der Marine, the Kriegsmarines most famous ships were the U-boats, most of which were constructed after Plan Z was abandoned at the beginning of World War II. However, the adoption of convoy escorts, especially in the Atlantic, after the Second World War, the Kriegsmarines remaining ships were divided up amongst the Allied powers and were used for various purposes including minesweeping. Adolf Hitler was the Commander-in-Chief of all German armed forces, including the Kriegsmarine and his authority was exercised through the Oberkommando der Marine, or OKM, with a Commander-in-Chief, a Chief of Naval General Staff and a Chief of Naval Operations. The first Commander-in-Chief of the OKM was Erich Raeder who was the Commander-in-Chief of the Reichsmarine when it was renamed and reorganized in 1935, Raeder held the post until falling out with Hitler after the German failure in the Battle of the Barents Sea. He was replaced by Karl Dönitz on 30 January 1943 who held the command until he was appointed President of Germany upon Hitlers suicide in April 1945, hans-Georg von Friedeburg was then Commander-in-Chief of the OKM for the short period of time until Germany surrendered in May 1945. Subordinate to these were regional, squadron and temporary flotilla commands, regional commands covered significant naval regions and were themselves sub-divided, as necessary. They were commanded by a Generaladmiral or an Admiral, there was a Marineoberkommando for the Baltic Fleet, Nord, Nordsee, Norwegen, Ost/Ostsee, Süd and West. The Kriegsmarine used a form of encoding called Gradnetzmeldeverfahren to denote regions on a map, each squadron also had a command structure with its own Flag Officer. The commands were Battleships, Cruisers, Destroyers, Submarines, Torpedo Boats, Minesweepers, Reconnaissance Forces, Naval Security Forces, Big Guns and Hand Guns, major naval operations were commanded by a Flottenchef. The Flottenchef controlled a flotilla and organized its actions during the operation, the commands were, by their nature, temporary. As a result the German surface fleet was plagued by design flaws throughout the war, military aircraft were also banned, so Germany could have no naval aviation. Under the treaty Germany could only build new ships to replace old ones, All the ships allowed and personnel were taken over from the Kaiserliche Marine, renamed Reichsmarine. From the outset, Germany worked to circumvent the restrictions of the Treaty of Versailles. The launching of the first pocket battleship, Deutschland in 1931 was a step in the formation of a modern German fleet, modern destroyers and light cruisers were also built
19.
2nd U-boat Flotilla
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The 2nd U-boat Flotilla, also known as the Saltzwedel Flotilla, was the second operational U-boat unit in Nazi Germanys Kriegsmarine. Founded on 1 September 1936 under the command of Fregattenkapitän Werner Scheer, Saltzwedel, a U-boat commander during World War I, died on 2 December 1917, when his submarine UB-81 was sunk by a mine in the English Channel. The flotilla was based in Kiel for the first few weeks after its formation, but was moved to Wilhelmshaven. In June 1940, the flotilla was moved to Lorient in France until it was disbanded in August 1944, uboat. net – comprehensive website dedicated to U-boat history
20.
Captain lieutenant
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Captain lieutenant or captain-lieutenant is a military rank, used in a number of navies worldwide and formerly in the British Army. It is generally equivalent to the Commonwealth or US rank of lieutenant, the same rank is used in the navies of Finland, Denmark and Norway. The Norwegian Navy goes a step further in ranking the kapteinløytnant as OF-3 when serving afloat, in the Estonian Navy the similarly sounding rank of kaptenleitnant is an officer rank classified as NATO OF-4, i. e. equal to commander in the Royal Navy and United States Navy. As the commander of the Estonian Navy is a captain, this is the de facto second highest rank in the Estonian Navy, the French Army of the Ancien Régime used a rank of capitaine-lieutenant very similar to the British one. It was mostly encountered in the Royal Guard, where the king was officially captain of most of the guard companies, dArtagnan is perhaps the most famous captain-lieutenant in French history, as commander of the first mousquetaire company. Kapitänleutnant is an OF2 rank equivalent to the Hauptmann in the German Army, see also In the Royal Netherlands Navy, a kapitein-luitenant ter zee is equivalent to a US Navy or Royal Navy commander. In the Portuguese Navy, a capitão-tenente is the equivalent naval rank to a British or American lieutenant commander, the Brazilian Navy uses the rank of capitão-tenente, in the same manner as the Navy of Portugal, but in contrast to those of other South American countries. It is equivalent to the USN and RN lieutenant, kapitan-leytenant is a rank in the Russian Navy, previously the Red Fleet/Soviet Navy and Imperial Russian Navy. It is the rank below a captain of the 3rd rank, in Soviet times, it may be achieved as early as an officers 5th year of service. In Russian and other East-European navies it is the most senior officer rank. The Russian Navy assigns this rank the two-and-a-half stripe insignia used in Britain, on the other hand, the US Navy considers this rank equivalent to lieutenant. In terms of responsibilities, officers of rank may serve as department heads on larger warships. Unlike the equivalent OF2-rank Kapitänleutnant in the German Navy, submarines are at least nominally not on the list of eligible positions, in the past, when the boats were smaller, captain-lieutenants were eligible for the submarine command. However, in current Soviet/Russian ship ranking no modern submarine is given 3rd rank and this reflects the high status of submarines, as all nuclear submarines are considered 1st rank and large and medium diesels 2nd rank, while smaller 3rd rank submarines simply arent built. Rank insignia IRA, Soviet Navy, RF Navy The rank is used by the navies of several ex-Soviet republics. It is used in the navies of Ukraine, Bulgaria and Latvia, captain-lieutenant was formerly a rank in the British Army, the senior subaltern rank, above lieutenant and below captain. A regiments field officers - its colonel, lieutenant colonel, and major - originally commanded their own companies and this left the colonels company without a captain. The lieutenant of this company thus became its acting captain and this state of affairs was formally recognised with the creation of the rank of captain-lieutenant, with its own entry in the table of prices for the purchase of commissions
21.
German submarine U-505
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U-505 is a German Type IXC U-boat built for Nazi Germanys Kriegsmarine during World War II. She was captured on 4 June 1944 by United States Navy Task Group 22.3 and her codebooks, Enigma machine, and other secret materials found on board helped the Allied codebreakers. All but one of U-505s crew were rescued by the Navy task group, the submarine was towed to Bermuda in secret and her crew was interned at a US prisoner-of-war camp where they were denied access to International Red Cross visits. The Navy classified the capture as top secret and prevented its discovery by the Germans, in 1954, U-505 was donated to the Museum of Science and Industry in Chicago, Illinois and is now a museum ship. She is one of six U-boats that were captured by Allied forces during World War II, U-505 is one of four German World War II U-boats that survive as museum ships, and one of two Type IXCs still in existence, the other being U-534. German Type IXC submarines were larger than the original Type IXBs. U-505 had a displacement of 1,120 tonnes when at the surface and 1,232 tonnes while submerged. The U-boat had a length of 76.76 m, a pressure hull length of 58.75 m, a beam of 6.76 m, a height of 9.60 m. She had two shafts and two 1.92 m propellers, the boat was capable of operating at depths of up to 230 meters. The submarine had a surface speed of 18.3 knots. When submerged, the boat could operate for 63 nautical miles at 4 knots, when surfaced, she could travel 13,450 nautical miles at 10 knots. U-505 was fitted with six 53.3 cm torpedo tubes,22 torpedoes, one 10.5 cm SK C/32 naval gun,180 rounds, the boat had a complement of forty-eight. U-505s keel was laid down on 12 June 1940 by Deutsche Werft in Hamburg and she was launched on 25 May 1941 and commissioned on 26 August with Kapitänleutnant Axel-Olaf Loewe in command. On 6 September 1942, Loewe was relieved by Kptlt, on 24 October 1943, Oberleutnant zur See Paul Meyer took command for about two weeks until he was relieved on 8 November by Oblt. z. S. Lange then commanded the boat until her capture on 4 June 1944 and she conducted twelve patrols in her career, sinking eight ships totaling 44,962 gross register tons. Three of these were American, two British, one Norwegian, one Dutch, and one Colombian, following training exercises with the 4th U-boat Flotilla from 26 August 1941 to 31 January 1942, U-505 was assigned as an operational boat to the 2nd U-boat Flotilla on 1 February. She began her first patrol from Kiel on 19 January while still undergoing training. For 16 days, she circumnavigated the British Isles, and docked at Lorient, during her first patrol, U-505 engaged no enemy vessels and was not attacked
22.
National Register of Historic Places
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The National Register of Historic Places is the United States federal governments official list of districts, sites, buildings, structures, and objects deemed worthy of preservation. The passage of the National Historic Preservation Act in 1966 established the National Register, of the more than one million properties on the National Register,80,000 are listed individually. The remainder are contributing resources within historic districts, each year approximately 30,000 properties are added to the National Register as part of districts or by individual listings. For most of its history the National Register has been administered by the National Park Service and its goals are to help property owners and interest groups, such as the National Trust for Historic Preservation, coordinate, identify, and protect historic sites in the United States. While National Register listings are mostly symbolic, their recognition of significance provides some financial incentive to owners of listed properties, protection of the property is not guaranteed. During the nomination process, the property is evaluated in terms of the four criteria for inclusion on the National Register of Historic Places, the application of those criteria has been the subject of criticism by academics of history and preservation, as well as the public and politicians. Occasionally, historic sites outside the proper, but associated with the United States are also listed. Properties can be nominated in a variety of forms, including individual properties, historic districts, the Register categorizes general listings into one of five types of properties, district, site, structure, building, or object. National Register Historic Districts are defined geographical areas consisting of contributing and non-contributing properties, some properties are added automatically to the National Register when they become administered by the National Park Service. These include National Historic Landmarks, National Historic Sites, National Historical Parks, National Military Parks/Battlefields, National Memorials, on October 15,1966, the Historic Preservation Act created the National Register of Historic Places and the corresponding State Historic Preservation Offices. Initially, the National Register consisted of the National Historic Landmarks designated before the Registers creation, approval of the act, which was amended in 1980 and 1992, represented the first time the United States had a broad-based historic preservation policy. To administer the newly created National Register of Historic Places, the National Park Service of the U. S. Department of the Interior, hartzog, Jr. established an administrative division named the Office of Archeology and Historic Preservation. Hartzog charged OAHP with creating the National Register program mandated by the 1966 law, ernest Connally was the Offices first director. Within OAHP new divisions were created to deal with the National Register, the first official Keeper of the Register was William J. Murtagh, an architectural historian. During the Registers earliest years in the late 1960s and early 1970s, organization was lax and SHPOs were small, understaffed, and underfunded. A few years later in 1979, the NPS history programs affiliated with both the U. S. National Parks system and the National Register were categorized formally into two Assistant Directorates. Established were the Assistant Directorate for Archeology and Historic Preservation and the Assistant Directorate for Park Historic Preservation, from 1978 until 1981, the main agency for the National Register was the Heritage Conservation and Recreation Service of the United States Department of the Interior. In February 1983, the two assistant directorates were merged to promote efficiency and recognize the interdependency of their programs, jerry L. Rogers was selected to direct this newly merged associate directorate
23.
National Historic Landmark
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A National Historic Landmark is a building, district, object, site, or structure that is officially recognized by the United States government for its outstanding historical significance. Of over 85,000 places listed on the countrys National Register of Historic Places, a National Historic Landmark District may include contributing properties that are buildings, structures, sites or objects, and it may include non-contributing properties. Contributing properties may or may not also be separately listed, prior to 1935, efforts to preserve cultural heritage of national importance were made by piecemeal efforts of the United States Congress. The first National Historic Site designation was made for the Salem Maritime National Historic Site on March 17,1938. In 1960, the National Park Service took on the administration of the data gathered under this legislation. Because listings often triggered local preservation laws, legislation in 1980 amended the procedures to require owner agreement to the designations. On October 9,1960,92 properties were announced as designated NHLs by Secretary of the Interior Fred A. Seaton, more than 2,500 NHLs have been designated. Most, but not all, are in the United States, there are NHLs in all 50 states and the District of Columbia. Three states account for nearly 25 percent of the nations NHLs, three cities within these states all separately have more NHLs than 40 of the 50 states. In fact, New York City alone has more NHLs than all but five states, Virginia, California, Pennsylvania, Massachusetts, there are 74 NHLs in the District of Columbia. Some NHLs are in U. S. commonwealths and territories, associated states, and foreign states. There are 15 in Puerto Rico, the Virgin Islands, and other U. S. commonwealths and territories,5 in U. S. -associated states such as Micronesia, over 100 ships or shipwrecks have been designated as NHLs. About half of the National Historic Landmarks are privately owned, the National Historic Landmarks Program relies on suggestions for new designations from the National Park Service, which also assists in maintaining the landmarks. A friends group of owners and managers, the National Historic Landmark Stewards Association, works to preserve, protect, if not already listed on the National Register of Historic Places, an NHL is automatically added to the Register upon designation. About three percent of Register listings are NHLs, american Water Landmark List of U. S
24.
Geographic coordinate system
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A geographic coordinate system is a coordinate system used in geography that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are chosen such that one of the numbers represents a vertical position. A common choice of coordinates is latitude, longitude and elevation, to specify a location on a two-dimensional map requires a map projection. The invention of a coordinate system is generally credited to Eratosthenes of Cyrene. Ptolemy credited him with the adoption of longitude and latitude. Ptolemys 2nd-century Geography used the prime meridian but measured latitude from the equator instead. Mathematical cartography resumed in Europe following Maximus Planudes recovery of Ptolemys text a little before 1300, in 1884, the United States hosted the International Meridian Conference, attended by representatives from twenty-five nations. Twenty-two of them agreed to adopt the longitude of the Royal Observatory in Greenwich, the Dominican Republic voted against the motion, while France and Brazil abstained. France adopted Greenwich Mean Time in place of local determinations by the Paris Observatory in 1911, the latitude of a point on Earths surface is the angle between the equatorial plane and the straight line that passes through that point and through the center of the Earth. Lines joining points of the same latitude trace circles on the surface of Earth called parallels, as they are parallel to the equator, the north pole is 90° N, the south pole is 90° S. The 0° parallel of latitude is designated the equator, the plane of all geographic coordinate systems. The equator divides the globe into Northern and Southern Hemispheres, the longitude of a point on Earths surface is the angle east or west of a reference meridian to another meridian that passes through that point. All meridians are halves of great ellipses, which converge at the north and south poles, the prime meridian determines the proper Eastern and Western Hemispheres, although maps often divide these hemispheres further west in order to keep the Old World on a single side. The antipodal meridian of Greenwich is both 180°W and 180°E, the combination of these two components specifies the position of any location on the surface of Earth, without consideration of altitude or depth. The grid formed by lines of latitude and longitude is known as a graticule, the origin/zero point of this system is located in the Gulf of Guinea about 625 km south of Tema, Ghana. To completely specify a location of a feature on, in, or above Earth. Earth is not a sphere, but a shape approximating a biaxial ellipsoid. It is nearly spherical, but has an equatorial bulge making the radius at the equator about 0. 3% larger than the radius measured through the poles, the shorter axis approximately coincides with the axis of rotation
25.
U-boat
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U-boat is the anglicised version of the German word U-Boot, a shortening of Unterseeboot, literally undersea boat. While the German term refers to any submarine, the English one refers specifically to military submarines operated by Germany, particularly in the First and Second World Wars. Although at times they were efficient fleet weapons against enemy warships, they were most effectively used in an economic warfare role. Austro-Hungarian navy submarines were known as U-boats. The first submarine built in Germany, the three-man Brandtaucher, sank to the bottom of Kiel harbor on 1 February 1851 during a test dive, the inventor and engineer Wilhelm Bauer had designed this vessel in 1850, and Schweffel & Howaldt constructed it in Kiel. Dredging operations in 1887 rediscovered Brandtaucher, it was raised and put on display in Germany, there followed in 1890 the boats WW1 and WW2, built to a Nordenfelt design. The SM U-1 was a completely redesigned Karp-class submarine and only one was built, the Imperial German Navy commissioned it on 14 December 1906. It had a hull, a Körting kerosene engine. The 50%-larger SM U-2 had two torpedo tubes, the U-19 class of 1912–13 saw the first diesel engine installed in a German navy boat. At the start of World War I in 1914, Germany had 48 submarines of 13 classes in service or under construction, during that war the Imperial German Navy used SM U-1 for training. Retired in 1919, it remains on display at the Deutsches Museum in Munich, on 5 September 1914, HMS Pathfinder was sunk by SM U-21, the first ship to have been sunk by a submarine using a self-propelled torpedo. On 22 September, U-9 sank the obsolete British warships HMS Aboukir, HMS Cressy, for the first few months of the war, U-boat anticommerce actions observed the prize rules of the time, which governed the treatment of enemy civilian ships and their occupants. On 20 October 1914, SM U-17 sank the first merchant ship, surface commerce raiders were proving to be ineffective, and on 4 February 1915, the Kaiser assented to the declaration of a war zone in the waters around the British Isles. This was cited as a retaliation for British minefields and shipping blockades, under the instructions given to U-boat captains, they could sink merchant ships, even potentially neutral ones, without warning. In February 1915, a submarine U-6 was rammed and both periscopes were destroyed off Beachy Head by the collier SS Thordis commanded by Captain John Bell RNR after firing a torpedo, on 7 May 1915, SM U-20 sank the liner RMS Lusitania. The sinking claimed 1,198 lives,128 of them American civilians, munitions that it carried were thousands of crates full of ammunition for rifles, 3-inch artillery shells, and also various other standard ammunition used by infantry. The sinking of the Lusitania was widely used as propaganda against the German Empire, a widespread reaction in the U. S was not seen until the sinking of the ferry SS Sussex. The sinking occurred in 1915 and the United States entered the war in 1917, the initial U. S. response was to threaten to sever diplomatic ties, which persuaded the Germans to issue the Sussex pledge that reimposed restrictions on U-boat activity
26.
Task Force 20
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Task Force 20 was a task force for the now-deactivated United States Second Fleet, as well as a now-inactive task force for the United States Fleet Forces Command. In its Second Fleet role, TF-20 served as that fleets Battle Force and this was the documented case from 1978–87, and from probably much earlier. The task force was intended primarily at that time to undertake attacks on Soviet Navy bases on the Kola Peninsula in the event of a general war. From 21–27 November 1946, USS Missouri was en route to Davis Strait as part of Task Group 20.2, which also included the cruiser Little Rock and destroyer USS Fechteler. Between 27 November and 4 December, she participated in exercises in Davis Strait. An incident during that cruise involving the USS Little Rock and she was off the port side firing 5-inch star shells for illumination, to spot icebergs, when there was a misfire. According to standard procedure the gunner began to point the barrel toward the water to wait out a hangfire, however, the round cooked off halfway down. The round hit the Missouri on the bridge, killing Coxswain Robert Fountain. One or two officers cabins were destroyed as well, Missouri did not get back to Norfolk until 13 December 1946. Commander Carrier Group 6 served as CTG20.2 for a Mediterranean deployment aboard USS America in April 1984. In late October 1983, USS Independence s battle group, assigned to the Second Fleet, became the core of Task Group 20.5, on 25 October 1983, aircraft from Independences embarked air wing flew missions supporting the invasion. S. Fleet Forces Command and the director of Combined Joint Operations From The Sea, Task Force 20 was commanded by Vice Admiral David H. Buss) from 30 September 2011 until its disestablishment on 24 August 2012. In effect, the tasks of the Second Fleet commander and staff were reassigned to Commander and these two individuals will report directly to me for their respective portfolios. Task Force 20 was disestablished effective 1 October 2012, and its functions transferred to Task Force 80
27.
Bermuda
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Bermuda is a British Overseas Territory in the North Atlantic Ocean. It is approximately 1,070 km east-southeast of Cape Hatteras, North Carolina,1,236 km south of Cape Sable Island, Nova Scotia, Bermuda is an associate member of Caribbean Community. The first person known to have reached Bermuda was the Spanish sea captain Juan de Bermúdez in 1503 and he claimed the islands for the Spanish Empire. Bermúdez never landed on the islands, but made two visits to the archipelago, of which he created a recognisable map, shipwrecked Portuguese mariners are now thought to have been responsible for the 1543 inscription on Portuguese Rock. Subsequent Spanish or other European parties are believed to have released pigs there, the island was administered as an extension of Virginia by the Company until 1614. Its spin-off, the Somers Isles Company, took over in 1615, at that time, the companys charter was revoked, and the English Crown took over administration. The islands became a British colony following the 1707 unification of the parliaments of Scotland and England, after 1949, when Newfoundland became part of Canada, Bermuda became the oldest remaining British Overseas Territory. Since the return of Hong Kong to China in 1997, it is the most populous Territory and its first capital, St. Georges, was established in 1612 and is the oldest continuously inhabited English town in the New World. Bermudas economy is based on insurance and reinsurance, and tourism. Bermuda had one of the worlds highest GDP per capita for most of the 20th century, recently, its economic status has been affected by the global recession. The island is in the belt and prone to severe weather. However, it is protected from the full force of a hurricane by the coral reef that surrounds the island. It is 898 nautical miles northeast of Miami, Florida, and 667 nautical miles from Cape Sable Island, in Nova Scotia, Canada. The islands lie due east of Fripp Island, South Carolina, west-northwest of Cape Verde, southeast of New York City, New York, north-northwest of Brazil and north of San Juan, Puerto Rico. The archipelago is formed by points on the rim of the caldera of a submarine volcano that forms a seamount. The volcano is one part of a range that was formed as part of the process that formed the floor of the Atlantic. It has 103 km of coastline, the two incorporated municipalities in Bermuda are the City of Hamilton and the Town of St George. Bermuda is divided into nine parishes, which have some localities called villages, such as Flatts Village, although usually referred to in the singular, the territory consists of 181 islands, with a total area of 53.3 square kilometres
28.
International Committee of the Red Cross
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The International Committee of the Red Cross is a humanitarian institution based in Geneva, Switzerland and a three-time Nobel Prize Laureate. State parties to the four Geneva Conventions of 1949 and their Additional Protocols of 1977 and 2005 have given the ICRC a mandate to protect victims of international and internal armed conflicts, such victims include war wounded, prisoners, refugees, civilians, and other non-combatants. The ICRC is part of the International Red Cross and Red Crescent Movement along with the International Federation of Red Cross and Red Crescent Societies and 190 National Societies. It is the oldest and most honoured organization within the Movement and one of the most widely recognized organizations in the world, having won three Nobel Peace Prizes in 1917,1944, and 1963. When he arrived in the town of Solferino on the evening of 24 June, he witnessed the Battle of Solferino. In a single day, about 40,000 soldiers on both sides died or were wounded on the field. Henry Dunant was shocked by the aftermath of the battle, the suffering of the wounded soldiers. He completely abandoned the original intent of his trip and for days he devoted himself to helping with the treatment. He succeeded in organizing an overwhelming level of assistance by motivating the local population to aid without discrimination. Back in his home in Geneva, he decided to write a book entitled A Memory of Solferino which he published with his own money in 1862 and he sent copies of the book to leading political and military figures throughout Europe. In addition, he called for the development of international treaties to guarantee the neutrality and protection of wounded on the battlefield as well as medics. On 9 February 1863 in Geneva, Henry Dunant founded the Committee of the Five as a commission of the Geneva Society for Public Welfare. Their aim was to examine the feasibility of Dunants ideas and to organize a conference about their possible implementation. Eight days later, the five men decided to rename the committee to the International Committee for Relief to the Wounded, in October 1863, the international conference organized by the committee was held in Geneva to develop possible measures to improve medical services on the battle field. The states and kingdoms represented by delegates were Baden, Bavaria, France, Britain, Hanover, Hesse, Italy, the Netherlands, Austria, Prussia, Russia, Saxony, Sweden. Only one year later, the Swiss government invited the governments of all European countries, as well as the United States, Brazil, sixteen countries sent a total of twenty-six delegates to Geneva. On 22 August 1864, the conference adopted the first Geneva Convention for the Amelioration of the Condition of the Wounded in Armies in the Field. Representatives of 12 states and kingdoms signed the convention, Baden, Belgium, Denmark, France, Hesse, Italy, the Netherlands, Portugal, Prussia, Switzerland, Spain, and Württemberg
29.
Classified information
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Classified information is material that a government body claims is sensitive information that requires protection of confidentiality, integrity, or availability. Access is restricted by law or regulation to particular groups of people, a formal security clearance is often required to handle classified documents or access classified data. The clearance process requires a satisfactory background investigation. Documents and other assets are typically marked with one of several levels of sensitivity—e. g. Restricted, confidential, secret and top secret and this often includes security clearances for personnel handling the information. Although classified information refers to the formal categorization and marking of material by level of sensitivity, a distinction is often made between formal security classification and privacy markings such as commercial in confidence. Classifications can be used with additional keywords that give more detailed instructions on how data should be used or protected, with the passage of time much classified information becomes much less sensitive, and may be declassified and made public. Sometimes documents are released with information still considered confidential obscured, as in the example at right, the purpose of classification is to protect information. Higher classifications protect information that might endanger national security, Classification formalises what constitutes a state secret and accords different levels of protection based on the expected damage the information might cause in the wrong hands. However, classified information is leaked to reporters by officials for political purposes. Several U. S. presidents have leaked information to get their point across to the public. Although the classification systems vary from country to country, most have levels corresponding to the following British definitions Top Secret is the highest level of classified information. Information is further compartmented so that specific access using a word after top secret is a legal way to hide collective. Such material would cause exceptionally grave damage to security if made publicly available. The Washington Post reports in an investigation entitled Top Secret America, hold top-secret security clearances in the United States. Secret material would cause damage to national security if it were publicly available. In the United States, operational Secret information can be marked with an additional LIMDIS, Confidential material would cause damage or be prejudicial to national security if publicly available. Restricted material would cause undesirable effects if publicly available, some countries do not have such a classification, in public sectors, such as commercial industries, such a level is also called and known as Private Information
30.
Enigma machine
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The Enigma machines were a series of electro-mechanical rotor cipher machines developed and used in the early- to mid-twentieth century to protect commercial, diplomatic and military communication. Enigma was invented by the German engineer Arthur Scherbius at the end of World War I, early models were used commercially from the early 1920s, and adopted by military and government services of several countries, most notably Nazi Germany before and during World War II. Several different Enigma models were produced, but the German military models, however, Japanese and Italian models were also in use. Rejewski did that without knowing the machine wiring, so the result did not allow the Poles to read any messages, however, the French had a spy with access to German cipher materials that included the daily keys used in September and October 1932. Those keys included the plugboard settings, the French gave the material to the Poles, and Rejewski used some of that material and the message traffic in September and October to solve for the unknown rotor wiring. Consequently, the Poles were able to build their own Enigma machines, Rejewski was aided by cryptanalysts Jerzy Różycki and Henryk Zygalski, both of whom had been recruited with Rejewski from Poznań University. The Polish Cipher Bureau developed techniques to defeat the plugboard and find all components of the daily key, over time, the German cryptographic procedures improved, and the Cipher Bureau developed techniques and designed mechanical devices to continue breaking the Enigma traffic. In 1938, the Germans added complexity to the Enigma machines that finally became too expensive for the Poles to counter. The Poles had six bomby, but when the Germans added two more rotors, ten times as many bomby were needed, but the Poles did not have the resources, the demonstration represented a vital basis for the later British continuation and effort. During the war, British cryptologists decrypted a vast number of messages enciphered on Enigma, the intelligence gleaned from this source, codenamed Ultra by the British, was a substantial aid to the Allied war effort. Like other rotor machines, the Enigma machine is a combination of mechanical and electrical subsystems, the mechanical parts act in such a way as to form a varying electrical circuit. When a key is pressed, one or more move to form a new rotor configuration. Current flows through various components in the new configuration, ultimately lighting one display lamp, which shows the output letter. For example, when encrypting a message starting ANX. the operator would first press the A key, the operator would next press N, and then X in the same fashion, and so on. Current flowed from the battery through a depressed bi-directional keyboard switch to the plugboard, next, it passed through the plug A via the entry wheel, through the wiring of the three or four installed rotors, and entered the reflector. The repeated changes of electrical path through an Enigma scrambler implemented a polyalphabetic substitution cipher that provided Enigmas security, the diagram on the right shows how the electrical pathway changed with each key depression, which caused rotation of at least the right-hand rotor. Current passed into the set of rotors, into and back out of the reflector, the greyed-out lines are other possible paths within each rotor, these are hard-wired from one side of each rotor to the other. The letter A encrypts differently with consecutive key presses, first to G and this is because the right-hand rotor has stepped, sending the signal on a completely different route
31.
Cryptanalysis
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Cryptanalysis is the study of analyzing information systems in order to study the hidden aspects of the systems. Cryptanalysis is used to breach cryptographic security systems and gain access to the contents of encrypted messages, methods for breaking modern cryptosystems often involve solving carefully constructed problems in pure mathematics, the best-known being integer factorization. Given some encrypted data, the goal of the cryptanalyst is to gain as much information as possible about the original, attacks can be classified based on what type of information the attacker has available. Ciphertext-only, the cryptanalyst has access only to a collection of ciphertexts or codetexts, known-plaintext, the attacker has a set of ciphertexts to which he knows the corresponding plaintext. Chosen-plaintext, the attacker can obtain the corresponding to an arbitrary set of plaintexts of his own choosing. Adaptive chosen-plaintext, like an attack, except the attacker can choose subsequent plaintexts based on information learned from previous encryptions. Related-key attack, Like a chosen-plaintext attack, except the attacker can obtain ciphertexts encrypted under two different keys, the keys are unknown, but the relationship between them is known, for example, two keys that differ in the one bit. Attacks can also be characterised by the resources they require and those resources include, Time — the number of computation steps which must be performed. Memory — the amount of required to perform the attack. Data — the quantity and type of plaintexts and ciphertexts required for a particular approach and its sometimes difficult to predict these quantities precisely, especially when the attack isnt practical to actually implement for testing. But academic cryptanalysts tend to provide at least the estimated order of magnitude of their attacks difficulty, saying, for example, the results of cryptanalysis can also vary in usefulness. Global deduction — the attacker discovers a functionally equivalent algorithm for encryption and decryption, instance deduction — the attacker discovers additional plaintexts not previously known. Information deduction — the attacker gains some Shannon information about plaintexts not previously known, distinguishing algorithm — the attacker can distinguish the cipher from a random permutation. Academic attacks are often against weakened versions of a cryptosystem, such as a cipher or hash function with some rounds removed. In academic cryptography, a weakness or a break in a scheme is defined quite conservatively, it might require impractical amounts of time, memory. Furthermore, it might reveal a small amount of information, enough to prove the cryptosystem imperfect. Finally, an attack might only apply to a version of cryptographic tools, like a reduced-round block cipher. In practice, they are viewed as two sides of the coin, secure cryptography requires design against possible cryptanalysis
32.
Museum of Science and Industry (Chicago)
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The Museum of Science and Industry is located in Chicago, Illinois, in Jackson Park, in the Hyde Park neighborhood between Lake Michigan and The University of Chicago. It is housed in the former Palace of Fine Arts from the 1893 Worlds Columbian Exposition, based on 2009 attendance, the Museum of Science and Industry was the second largest cultural attraction in Chicago. David R. Mosena has been President and CEO of the Museum since 1998, the Palace of Fine Arts at the 1893 Worlds Columbian Exposition was designed by Charles B. Atwood for D. H. Burnham & Co, unlike the other White City buildings, it was constructed with a brick substructure under its plaster facade. After the Worlds Fair, it housed the Columbian Museum. When the Field Museum moved to a new building near downtown Chicago in 1920, Art Institute of Chicago professor Lorado Taft led a public campaign to restore the building and turn it into another art museum, one devoted to sculpture. However, after a few years, the building was selected as the site for a new science museum, at this time, the Commercial Club of Chicago was interested in establishing a science museum in Chicago. Julius Rosenwald, the Sears, Roebuck and Company president and philanthropist, during its conversion into the MSI, the buildings exterior was re-cast in limestone to retain its 1893 Beaux Arts look. The interior was replaced with a new one in Art Moderne style designed by Alfred P. Shaw, Rosenwald established the museum organization in 1926 but declined to have his name on the building. For the first few years, the museum was called the Rosenwald Industrial Museum. In 1928, the name of the museum was changed to the Museum of Science. Rosenwalds vision was to create a museum in the style of the Deutsches Museum in Munich, sewell Avery, another businessman, had supported the museum within the Commercial Club and was selected as its first president of the board of directors. The museum conducted a search for the first director. MSIs Board of Directors selected Waldemar Kaempffert, then the editor of The New York Times. He assembled the museums staff and directed the organizing and constructing the exhibits. In order to prepare the museum, Kaempffert and his staff visited the Deutsches Museum in Munich, the Science Museum in Kensington, Kaempffert was instrumental in developing close ties with the science departments of the University of Chicago, which supplied much of the scholarship for the exhibits. The new Museum of Science and Industry opened to the public in three stages between 1933 and 1940, the first opening ceremony took place during the Century of Progress Exposition. Two of the presidents, a number of curators and other staff members
33.
German submarine U-534
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German submarine U-534 is a Type IXC/40 U-boat of Nazi Germanys Kriegsmarine built for service during World War II. She was built in 1942 in Hamburg-Finkenwerder by Deutsche Werft AG as yard number 352 and she was launched on 23 September 1942 and commissioned on 23 December with Oberleutnant zur See Herbert Nollau in command. The U-boat is one of only four German World War II submarines in preserved condition remaining in the world, another being the IXC boat U-505 in Chicagos Museum of Science, U-534 was used mainly for training duties, and during her service she sank no other ships. A Royal Air Force bomber sank her on 5 May 1945 in the Kattegat 20 kilometres northeast of the Danish island of Anholt, U-534 was salvaged in 1993 and since February 2009 has been on display in Birkenhead, England as part of the U-boat Story. German Type IXC/40 submarines were larger than the original Type IXCs. U-534 had a displacement of 1,144 tonnes when at the surface and 1,257 tonnes while submerged. The U-boat had a length of 76.76 m, a pressure hull length of 58.75 m, a beam of 6.86 m, a height of 9.60 m. She had two shafts and two 1.92 m propellers, the boat was capable of operating at depths of up to 230 metres. The submarine had a surface speed of 18.3 knots. When submerged, the boat could operate for 63 nautical miles at 4 knots, when surfaced, she could travel 13,850 nautical miles at 10 knots. U-534 was fitted with six 53.3 cm torpedo tubes,22 torpedoes, one 10.5 cm SK C/32 naval gun,180 rounds, the boat had a complement of forty-eight. She was then reconfigured and in June 1943 transferred to the 2nd flotilla based in Saltzwedel, the U-534 headed for Bergen and arrived on 6 May 1944. Two days later she left on duty, along with the U-853 and U-857. Her first war patrol was plagued by an oil leak and bad weather in the North Atlantic, on 11 August she was attacked by an aircraft but escaped undamaged. Two days later she, along with the U-857 and U-437, was attacked by two Halifax bombers. The aircraft, E of No.58 Squadron RAF and K of No.502 Squadron RAF suffered heavy damage, and the U-534 arrived safely at Bordeaux. On the second patrol, from 25 August 1944 to 24 October, on 25 August the U-534 left Bordeaux and the new Schnorchel was used for the first time. Exhaust gases leaked into the boat and several crew members collapsed, surfacing for air, she was spotted and attacked by a Wellington bomber, B of No.172 Squadron RAF, which her gunners shot down on 27 August
34.
German Type IXB submarine
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The German Type IXB submarine was a sub-class of the German Type IX submarine built for Nazi Germanys Kriegsmarine between 1938 and 1940. The U-boats themselves were designed to be fairly large ocean-going submarines, the inspiration for the Type IXB submarine came from the earlier original Type IX submarine, the Type IXA submarine. The design of the IXA was developed to give an increased range and this design was improved even further in the later Type IXC submarines. The class comprised 14 submarines, U-64, U-65, U-103, U-104, U-105, U-106, U-107, U-108, U-109, U-110, U-111, U-122, U-123, the design of the IXB submarines came from the initial Type IX submarines, the Type IXA. All contracts for the construction of the submarines were awarded to DeSchiMAG AG Weser, the first U-boat to be laid down in the Bremen ship yards was U-65, whose keel was laid down on 6 December 1938. The last U-boat to be laid down was U-111, whose construction began on 20 February 1940, by the end of 1940, all Type IXB submarines had been fully constructed and commissioned into the Kriegsmarine. All Type IXB submarines had 1,000 PS while submerged and 4,400 PS when surfaced, as a result, they could travel at 18.2 knots while surfaced and 7.3 knots submerged. The Type IXB submarines had a range of 12,000 nmi at 10 knots while on the surface and 64 nmi at 4 knots while submerged and they had 6 torpedo tubes and carried a total of 2253.3 cm torpedoes. Unlike the earlier Type IXAs, the Type IXB submarines were equipped with 44 TMA mines as well, the Type IXB submarines were equipped with a 10.5 cm SK C/32 naval gun with 180 rounds on a Utof mount. The last piece of armament that the Type IXB submarines were equipped with were the standard 2 cm anti-aircraft guns, all Type IXB submarines could hold up to 56 crew members at any given time though that number was usually around 45–48 crew members. The Type IXB class had 14 U-boats, all of which were built by AG Weser of Bremen, German Type IX submarine German Type IXA submarine Gröner, Erich, Jung, Dieter, Maass, translated by Thomas, Keith, Magowan, Rachel
35.
Beam (nautical)
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The beam of a ship is its width at the widest point as measured at the ships nominal waterline. The beam is a bearing projected at right-angles from the fore and aft line, Beam may also be used to define the maximum width of a ships hull, or maximum width plus superstructure overhangs. Typical length-to-beam ratios for small sailboats are from 2,1 to 5,1, large ships have widely varying beam ratios, some as large as 20,1. Rowing shells designed for racing may have length to beam ratios as high as 30,1. The beam of many vessels can be calculated using the following formula. Some examples, For a standard 27 ft yacht, the root of 27 is 3,3 squared is 9 plus 1 =10. The beam of many 27 ft monohulls is 10 ft, for a Volvo Open 70 yacht,70.5 to the power of 2/3 =17 plus 1 =18. The beam is often around 18 ft, for a 741 ft long ship, the cube root is 9, and 9 squared is 81, plus 1. The beam will usually be around 82 ft, e. g. Seawaymax, as catamarans have more than one hull, there is a different beam calculation for this kind of vessel. BOC stands for Beam On Centerline and this term in typically used in conjunction with LOA. The ratio of LOA/BOC is used to estimate the stability of multihull vessels, the lower the ratio the greater the boats stability. The BOC for vessels is measured as follows, For a catamaran, carlin – similar to a beam, except running in a fore and aft direction. Keever, John M. American Merchant Seamans Manual, turpin, Edward A. McEwen, William A
36.
Draught (ship)
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Draft determines the minimum depth of water a ship or boat can safely navigate. The draft can also be used to determine the weight of the cargo on board by calculating the displacement of water. A table made by the shows the water displacement for each draft. The density of the water and the content of the bunkers has to be taken into account. The closely related term trim is defined as the difference between the forward and aft drafts, the draft aft is measured in the perpendicular of the stern. The draft forward is measured in the perpendicular of the bow, the scale may use traditional English units or metric units. If the English system is used, the bottom of each marking is the draft in feet, in metric marking schemes, the bottom of each draft mark is the draft in decimeters and each mark is one decimeter high. Larger ships try to maintain a water draft when they are light, in order to make a better sea crossing. In order to achieve this they use sailing ballasts to stabilize the ship, the water draft of a large ship has little direct link with its stability because stability depends solely on the respective positions of the metacenter of the hull and the center of gravity. It is also however, that a light ship has quite high stability which can lead to implying too much rolling of the ship. A fully laden ship can have either a strong or weak stability, the draft of ships can be increased when the ship is in motion in shallow water, a phenomenon known as squat. Draft is a significant factor limiting navigable waterways, especially for large vessels, of course this includes many shallow coastal waters and reefs, but also some major shipping lanes. Panamax class ships—the largest ships able to transit the Panama Canal—do have a limit but are usually limited by beam, or sometimes length overall. However, in the much wider Suez Canal, the factor for Suezmax ships is draft. Some supertankers are able to transit the Suez Canal when unladen or partially laden, canals are not the only draft-limited shipping lanes. A Malaccamax ship has the deepest draft able to transit the very busy, there are only a few ships of this size. A small draft allows pleasure boats to navigate through shallower water and this makes it possible for these boats to access smaller ports, to travel along rivers and even to beach the boat. A large draft ensures a level of stability in strong wind
37.
MAN SE
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MAN SE, formerly MAN AG, is a German mechanical engineering company and parent company of the MAN Group. MAN SE is based in Munich and its primary output is for the automotive industry, particularly heavy trucks. Further activities include the production of engines for various applications, like marine propulsion. MAN supplies trucks, buses, diesel engines and turbomachinery, until September 2012 MAN SE was one of the top 30 companies listed on the German stock exchange. The company celebrated its 250th anniversary in 2008, in 2008, its 51,300 employees generated annual sales of around €15 billion in 120 different countries. The MAN Group currently operates its production output through three main subsidiaries, with each subsidiarys output destined for different locations, MAN Truck & Bus is one of Europes leading commercial vehicle manufacturers. MAN Diesel & Turbo is a leader in large diesel ship engines, stationary engines. MAN Latin America has a position in heavy trucks in Brazil. MAN traces its origins back to 1758, when the St. Antony ironworks commenced operation in Oberhausen, as the first heavy-industry enterprise in the Ruhr region. In 1808, the three ironworks St. Antony, Gute Hoffnung, and Neue Essen merged, to form the Hüttengewerkschaft und Handlung Jacobi, Oberhausen, which was later renamed Gute Hoffnungshütte. In 1840, the German engineer Ludwig Sander founded in Augsburg the first predecessing enterprise of MAN in Southern Germany, reichenbachsche Maschinenfabrik, which was named after the pioneer of printing machines Carl August Reichenbach, and later on the Maschinenfabrik Augsburg. The branch Süddeutsche Brückenbau A. G. was founded when the company in 1859 was awarded the contract for the construction of the bridge over the Rhine at Mainz. In 1898, the companies Maschinenbau-AG Nürnberg and Maschinenfabrik Augsburg AG merged to form Vereinigte Maschinenfabrik Augsburg und Maschinenbaugesellschaft Nürnberg A. G. Augsburg, in 1908, the company was renamed Maschinenfabrik Augsburg Nürnberg AG, or in short, M·A·N. While the focus remained on ore mining and iron production in the Ruhr region. Under the direction of Heinrich von Buz, Maschinenfabrik Augsburg grew from a business of 400 employees into a major enterprise with a workforce of 12,000 by the year 1913. Locomotion, propulsion and steel building were the big topics of this phase, the early predecessors of MAN were responsible for numerous technological innovations. The success of the early MAN entrepreneurs and engineers like Heinrich Gottfried Gerber, was based on a great openness towards new technologies. They constructed the Wuppertal monorail and the first spectacular steel bridges like the Großhesseloher Brücke in Munich in 1857, during 1921, the majority of M. A. N. was taken over by the Gutehoffnungshütte Actienverein für Bergbau und Hüttenbetrieb, Sterkrade
38.
Supercharger
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A supercharger is an air compressor that increases the pressure or density of air supplied to an internal combustion engine. This gives each intake cycle of the more oxygen, letting it burn more fuel and do more work. Power for the supercharger can be provided mechanically by means of a belt, gear, shaft, when power is provided by a turbine powered by exhaust gas, a supercharger is known as a turbosupercharger – typically referred to simply as a turbocharger or just turbo. Common usage restricts the term supercharger to mechanically driven units, in 1848 or 1849 G. Jones of Birmingham, England brought out a Roots-style compressor. The worlds first functional, actually tested engine supercharger was made by Dugald Clerk, gottlieb Daimler received a German patent for supercharging an internal combustion engine in 1885. Louis Renault patented a centrifugal supercharger in France in 1902, an early supercharged race car was built by Lee Chadwick of Pottstown, Pennsylvania in 1908 which reportedly reached a speed of 100 mph. The worlds first series-produced cars with superchargers were Mercedes 6/25/40 hp, both models were introduced in 1921 and had Roots superchargers. They were distinguished as Kompressor models, the origin of the Mercedes-Benz badging which continues today, on March 24,1878 Heinrich Krigar of Germany obtained patent #4121, patenting the first ever screw-type compressor. Later that same year on August 16 he obtained patent #7116 after modifying and improving his original designs and his designs show a two-lobe rotor assembly with each rotor having the same shape as the other. Although the design resembled the Roots style compressor, the screws were clearly shown with 180 degrees of twist along their length, unfortunately, the technology of the time was not sufficient to produce such a unit, and Heinrich made no further progress with the screw compressor. Nearly half a century later, in 1935, Alf Lysholm and he also patented the method for machining the compressor rotors. There are two types of superchargers defined according to the method of gas transfer, positive displacement. Positive displacement blowers and compressors deliver an almost constant level of pressure increase at all engine speeds, dynamic compressors do not deliver pressure at low speeds, above a threshold speed, pressure increases with engine speed. Positive-displacement pumps deliver a nearly fixed volume of air per revolution at all speeds, Roots superchargers are external compression only. External compression refers to pumps that transfer air at ambient pressure into the engine, if the engine is running under boost conditions, the pressure in the intake manifold is higher than that coming from the supercharger. That causes a backflow from the engine into the supercharger until the two reach equilibrium and it is the backflow that actually compresses the incoming gas. This is an inefficient process and the factor in the lack of efficiency of Roots superchargers when used at high boost levels. The lower the boost level the smaller is this loss, and Roots blowers are very efficient at moving air at low pressure differentials, all the other types have some degree of internal compression
39.
Siemens-Schuckert
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Siemens-Schuckert was a German electrical engineering company headquartered in Berlin, Erlangen and Nuremberg that was incorporated into the Siemens AG in 1966. Siemens Schuckert was founded in 1903 when Siemens & Halske acquired Schuckertwerke, subsequently, Siemens & Halske specialized in communications engineering and Siemens-Schuckert in power engineering and pneumatic instrumentation. During World War I Siemens-Schuckert also produced aircraft and it took over manufacturing of the renowned Protos vehicles in 1908. The Siemens Schuckert logo consisted of an S with a smaller S superimposed on the middle with the smaller S rotated left by 45 degrees, the logo was used into the late 1960s, when both companies merged with the Siemens-Reiniger-Werke AG to form the present-day Siemens AG. Siemens-Schuckert built a number of designs in World War I and inter-war era and they also produced aircraft engines under the Siemens-Halske brand, which evolved into their major product line after the end of World War I. The company reorganized as Brandenburgische Motorenwerke, or simply Bramo, in 1936, Siemens-Schuckert designed a number of heavy bombers early in World War I, building a run of seven Riesenflugzeug. In the case of failure, which was extremely common at the time. Two transmission shafts transferred the power from the gear-box to propeller gear-boxes mounted on the wing struts, although there were some problems with the clutch system, the gear-box proved to be reliable when properly maintained. The SSW R.1 through the SSW R. VII designs were noted for their distinctive forked fuselage, several of these aircraft fought on the Eastern Front. A small number of machines were supplied to various Feldflieger Abteilung to supplement supplies of the Fokker. The prototype SSW E. II, powered by the inline Argus AsII, crashed in June 1916, killing Franz Steffen, the resulting SSW D. I was powered by the Siemens-Halske Sh. I, but was otherwise a fairly literal copy of the Nieuport 17. This aircraft was the first Siemens-Schuckert fighter to be ordered in quantity, development of the Sh. I engine resulted in the eleven-cylinder,160 hp Sh. III, perhaps one of the most advanced rotary engine designs of the war. Further modifications improved its handling and performance to produce the Siemens-Schuckert D. IV, several offshoots of the design included triplanes and a parasol monoplane, but none saw production. With the end of the war production of the D. IV continued, with the signing of the Treaty of Versailles the next year all aircraft production in Germany was shut down. Siemens-Schuckert immediately disappeared, but Siemens-Halske continued sales of the Sh. III, the Sh. 14A became a best-seller in the trainer market, and over 15,000 of all the versions were eventually built. Siemens-Halske no longer had any competitive engines for the end of the market. Minor changes for the German market led to the Sh.20, following the evolution of their smaller Sh. 14s, the engine was then bored out to produce the 900 hp design, the Sh.22. In 1933 new engine naming was introduced by the RLM, and this became the Sh.322
40.
Propeller
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A propeller is a type of fan that transmits power by converting rotational motion into thrust. A pressure difference is produced between the forward and rear surfaces of the blade, and a fluid is accelerated behind the blade. Their disadvantages are higher mechanical complexity and higher cost, the principle employed in using a screw propeller is used in sculling. It is part of the skill of propelling a Venetian gondola but was used in a less refined way in parts of Europe. For example, propelling a canoe with a paddle using a pitch stroke or side slipping a canoe with a scull involves a similar technique. In China, sculling, called lu, was used by the 3rd century AD. In sculling, a blade is moved through an arc. The innovation introduced with the propeller was the extension of that arc through more than 360° by attaching the blade to a rotating shaft. Propellers can have a blade, but in practice there are nearly always more than one so as to balance the forces involved. The origin of the screw propeller starts with Archimedes, who used a screw to lift water for irrigation and bailing boats and it was probably an application of spiral movement in space to a hollow segmented water-wheel used for irrigation by Egyptians for centuries. Leonardo da Vinci adopted the principle to drive his theoretical helicopter, in 1784, J. P. Paucton proposed a gyrocopter-like aircraft using similar screws for both lift and propulsion. At about the time, James Watt proposed using screws to propel boats. This was not his own invention, though, Toogood and Hays had patented it a century earlier, by 1827, Czech-Austrian inventor Josef Ressel had invented a screw propeller which had multiple blades fastened around a conical base. He had tested his propeller in February 1826 on a ship that was manually driven. He was successful in using his bronze screw propeller on an adapted steamboat and his ship Civetta with 48 gross register tons, reached a speed of about six knots. This was the first ship successfully driven by an Archimedes screw-type propeller, after a new steam engine had an accident his experiments were banned by the Austro-Hungarian police as dangerous. Josef Ressel was at the time a forestry inspector for the Austrian Empire, but before this he received an Austro-Hungarian patent for his propeller. This new method of propulsion was an improvement over the paddlewheel as it was not so affected by either ship motions or changes in draft as the burned coal
41.
Keel
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On boats and ships, keel can refer to either of two parts, a structural element that sometimes resembles a fin and protrudes below a boat along the central line, or a hydrodynamic element. As the laying down of the keel is the step in the construction of a ship, in British. Only the ships launching is considered significant in its creation. The word can also be used as a synecdoche to refer to a complete boat, a structural keel is the bottom-most structural member around which the hull of a ship is built. The keel runs along the centerline of the ship, from the bow to the stern. The keel is often the first part of a hull to be constructed. The most common type of keel is the plate keel. A form of keel found on smaller vessels is the bar keel, which may be fitted in trawlers, tugs, and smaller ferries. Where grounding is possible, this type of keel is suitable with its massive scantlings, if a double bottom is fitted, the keel is almost inevitably of the flat plate type, bar keels often being associated with open floors, where the plate keel may also be fitted. Duct keels are provided in the bottom of some vessels and these run from the forward engine room bulkhead to the collision bulkhead and are utilized to carry the double bottom piping. The piping is then accessible when cargo is loaded, the keel surface on the bottom of the hull gives the ship greater directional control and stability. In non-sailing hulls, the helps the hull to move forward. In traditional boat building, this is provided by the structural keel, in modern construction, the bar keel or flat-plate keel performs the same function. There are many types of fixed keels, including full keels, long keels, fin keels, winged keels, bulb keels, the rudimentary purpose of the keel is to convert the sideways motion of the wind when it is abeam into forward motion. A secondary purpose of the keel is to provide ballast, keels are different from centreboards and other types of foils in that keels are made of heavy materials to provide ballast to stabilize the boat. Keels may be fixed, or non-movable, or they may retract to allow sailing in shallower waters, retracting keels may pivot or slide upwards to retract, and are usually retracted with a winch due to the weight of the ballast. Since the keel provides far more stability when lowered than when retracted, types of non-fixed keels include swing keels and canting keels. Canting keels can be found on racing yachts, such as competing in the Volvo Ocean Race
42.
Keel laying
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Laying the keel or laying down is the formal recognition of the start of a ships construction. It is often marked with a ceremony attended by dignitaries from the shipbuilding company, keel laying is one of the four specially-celebrated events in the life of a ship, the others are launching, commissioning, and decommissioning. In earlier times, the event recognized as the keel laying was the placement of the central timber making up the backbone of a vessel. As steel ships replaced wooden ones, the central timber gave way to a steel beam. Modern ships are now built in a series of pre-fabricated. The event recognized as the keel laying is the first joining of modular components and it is now often called keel authentication, and is the ceremonial beginning of the ships life, although modules may have been started months before that stage of construction. Keel-related traditions from the times of wooden ships are said to bring luck to the ship during construction and to the captain, the first milestone in the history of a ship is the generally simple ceremony that marks the laying of the keel. Invitations to the ceremony are issued by officials, and the ceremony is conducted by them. The builder may be the commander of a shipyard or the president of a private company. The ships prospective name, without the USS, is mentioned in the invitation, if known, otherwise her type and number are given, e. g. DD2217
Germany
United Kingdom
Norway
United States
Netherlands
Colombia
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