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Operation Caesar
Operation Caesar () was a secret mission carried out by Germany in the Second World War to supply Japan with advanced technology. The operation failed due to the sinking of U-864 by a British submarine, the only known example of a submerged submarine sinking another submerged submarine. The operation On 5 December 1944, ''U-864'', on her maiden voyage, was dispatched on a secret mission to deliver supplies to Japan. ''U-864''s primary cargo was advanced Messerschmitt jet engine parts for use in Japanese aircraft and V-2 missile guidance systems. Her secondary cargo comprised of the strategic material mercury in 1,857 canisters for use in weapons production. She left Kiel and headed north. While going through the Kiel Canal, ''U-864'' grounded and damaged her hull. Her captain, Ralf-Reimar Wolfram, decided to sail to the U-boat pens at Bergen, Norway. On 12 January 1945, while ''U-864'' was still undergoing repairs, British bombers attacked the pens, delaying the repai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Second World War
World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the world's countries participated, with many nations mobilising all resources in pursuit of total war. Tanks in World War II, Tanks and Air warfare of World War II, aircraft played major roles, enabling the strategic bombing of cities and delivery of the Atomic bombings of Hiroshima and Nagasaki, first and only nuclear weapons ever used in war. World War II is the List of wars by death toll, deadliest conflict in history, causing World War II casualties, the death of 70 to 85 million people, more than half of whom were civilians. Millions died in genocides, including the Holocaust, and by massacres, starvation, and disease. After the Allied victory, Allied-occupied Germany, Germany, Allied-occupied Austria, Austria, Occupation of Japan, Japan, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kiel Canal
The Kiel Canal (, until 1948 called in German the ) is a fresh water canal that links the North Sea () to the Baltic Sea (). It runs through the Germany, German states of Germany, state of Schleswig-Holstein, from Brunsbüttel to the Holtenau district of Kiel. It was constructed from 1887 to 1895 and widened from 1907 to 1914. In addition to the two sea entrances, at Oldenbüttel the Kiel Canal is linked to the navigable Eider (river), River Eider by the short Gieselau Canal. An average of is saved by using the Kiel Canal instead of going around the Jutland, Jutland Peninsula. This saves time and fuel, avoids storm-prone seas, and avoids passing through the Danish straits. The Kiel Canal is one of the world's most frequented artificial waterways with an annual average of 32,000 ships (90 daily), transporting approximately 100 million tonnes of goods. History The first connection between the North and Baltic Seas was constructed while the area was ruled by Denmark–Norway. It w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Royal Norwegian Navy
The Royal Norwegian Navy () is the branch of the Norwegian Armed Forces responsible for navy, naval operations of Norway, including those of the Norwegian Coast Guard. , the Royal Norwegian Navy consists of approximately 3,700 personnel (9,450 in mobilized state, 32,000 when fully mobilized) and 70 vessels, including 4 heavy frigates, 6 submarines, 14 patrol boats, 4 Minesweeper (ship), minesweepers, 4 minehunters, 1 mine detection vessel, 4 support vessels and 2 training vessels. This navy has a history dating back to 955. From 1509 to 1814, it formed part of the navy of history of the Danish navy, Denmark-Norway, also referred to as the "Common Fleet". Since 1814, the Royal Norwegian Navy has again existed as a separate navy. In Norwegian, all its naval vessels since 1946 bear the ship prefix ''KNM'', which stands for "Kongelige Norske Marine" (which translates to "Royal Norwegian Navy"); in English, these vessels are identified by the prefix ''HNoMS'', meaning "His/Her Norweg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Distinguished Service Order
The Distinguished Service Order (DSO) is a Military awards and decorations, military award of the United Kingdom, as well as formerly throughout the Commonwealth of Nations, Commonwealth, awarded for operational gallantry for highly successful command and leadership during active operations, typically in actual combat. Equal in Awards and decorations of the British Armed Forces, British precedence of military decorations to the Conspicuous Gallantry Cross and Royal Red Cross, since 1993 the DSO is eligible to all Military rank, ranks awarded specifically for "highly successful command and leadership during active operations". History Instituted on 6 September 1886 by Queen Victoria by Warrant (law), Royal Warrant published in ''The London Gazette'' on 9 November, the first DSOs awarded were dated 25 November 1886. The Order (distinction), order was established to recognise individual instances of meritorious or distinguished service in war. It is a military order, and wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Submarine Snorkel
A submarine snorkel is a device which allows the engine of a submarine to operate Underwater, submerged while still taking in air from above the surface. British Royal Navy personnel often refer to it as the snort. A concept devised by Dutch engineers, it was widely used on German U-boats during the last year of World War II and known to them as a . History Until the advent of Nuclear submarine, nuclear power, submarines were designed to operate on the surface most of the time and submerge only for evasion or for daylight attacks. Until the widespread use of radar after 1940, at night a submarine was safer on the surface than submerged, because sonar could detect boats underwater but was almost useless against a surface vessel. However, with continued radar improvement as the war progressed, submarines (notably, the Germany, German U-boat, U-boats in the Battle of the Atlantic) were forced to spend more time underwater, running on electric motors that gave speeds of only a fe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrophone
A hydrophone () is a microphone designed for underwater use, for recording or listening to underwater sound. Most hydrophones contains a piezoelectric transducer that generates an electric potential when subjected to a pressure change, such as a sound wave. A hydrophone can also detect airborne sounds but is insensitive of them because it is designed to match the acoustic impedance of water, a denser fluid than air. Sound travels 4.3 times faster in water than in air, and a sound wave in water exerts a pressure 60 times more than what is exerted by a wave of the same amplitude in air. Similarly, a standard microphone can be buried in the ground, or immersed in water if it is put in a waterproof container but will give poor performance because of the similarly-bad acoustic impedance match. History The first hydrophones consisted of a tube with a thin membrane covering the submerged end and the observer's ear of the equipment. The design of effective hydrophones must take into a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fedje (island)
Fedje is the largest island in Fedje Municipality in Vestland county, Norway. The island is home to almost all of the municipality's residents. The island sits west of the Fedjefjorden, south of the mouth of the Fensfjorden, and north of the islands of Øygarden. The North Sea lies to the west of the island. The main population center on the island is the village of Fedje on the northern coast of the island. The southern coast of the island is the site of the other village on the island, Stormark. The tall Fedjebjørnen is the highest point on the mountain. Hellisøy Lighthouse lies just off the southwestern coast of the island. See also * List of islands of Norway This is a list of islands of Norway sorted by name. For a list sorted by area, see List of islands of Norway by area. A * Alden * Aldra * Algrøy * Alsta * Altra * Anda * Andabeløya * Andørja * Andøya, Vesterålen * Andøya, Agder ... References Islands of Vestland Fedje {{Vest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lerwick
Lerwick ( or ; ; ) is the main town and port of the Shetland archipelago, Scotland. Shetland's only burgh, Lerwick had a population of about 7,000 residents in 2010. It is the northernmost major settlement within the United Kingdom. Centred off the north coast of the Scottish mainland and on the east coast of the Shetland Mainland, Lerwick lies boxing the compass, north-by-northeast of Aberdeen; west of the similarly sheltered port of Bergen in Norway; and south east of Tórshavn in the Faroe Islands. One of the list of coastal weather stations of the United Kingdom, UK's coastal weather stations is situated there, with Lerwick#Climate, the local climate having small seasonal variation due to the maritime influence. Being located further north than Saint Petersburg and three of the four mainland Scandinavia, Nordic capitals, and on the same latitude as Anchorage, Alaska, Lerwick's nights in the middle of summer only get dark twilight and winters have below six hours of comp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Admiralty
The Admiralty was a Departments of the Government of the United Kingdom, department of the Government of the United Kingdom that was responsible for the command of the Royal Navy. Historically, its titular head was the Lord High Admiral of the United Kingdom, Lord High Admiral – one of the Great Officers of State. For much of its history, from the early Admiralty in the 18th century, 18th century until its abolition, the role of the Lord High Admiral was almost invariably put "in commission" and exercised by the Lords Commissioner of the Admiralty, who sat on the governing Board of Admiralty, rather than by a single person. The Admiralty was replaced by the Admiralty Board (United Kingdom), Admiralty Board in 1964, as part of the reforms that created the Ministry of Defence (United Kingdom), Ministry of Defence and its Navy Department (Ministry of Defence), Navy Department (later Navy Command (Ministry of Defence), Navy Command). Before the Acts of Union 1707, the Office of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Enigma Machine
The Enigma machine is a cipher device developed and used in the early- to mid-20th century to protect commercial, diplomatic, and military communication. It was employed extensively by Nazi Germany during World War II, in all branches of the Wehrmacht, German military. The Enigma machine was considered so secure that it was used to encipher the most top-secret messages. The Enigma has an electromechanical Rotor machine, rotor mechanism that scrambles the 26 letters of the alphabet. In typical use, one person enters text on the Enigma's keyboard and another person writes down which of the 26 lights above the keyboard illuminated at each key press. If plaintext is entered, the illuminated letters are the ciphertext. Entering ciphertext transforms it back into readable plaintext. The rotor mechanism changes the electrical connections between the keys and the lights with each keypress. The security of the system depends on machine settings that were generally changed daily, based ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bletchley Park
Bletchley Park is an English country house and Bletchley Park estate, estate in Bletchley, Milton Keynes (Buckinghamshire), that became the principal centre of Allies of World War II, Allied World War II cryptography, code-breaking during the Second World War. During World War II, the estate housed the Government Code and Cypher School (GC&CS), which regularly penetrated the secret communications of the Axis Powers most importantly the German Enigma machine, Enigma and Lorenz cipher, Lorenz ciphers. The GC&CS team of codebreakers included John Tiltman, Dilwyn Knox, Alan Turing, Harry Golombek, Gordon Welchman, Conel Hugh O'Donel Alexander, Hugh Alexander, Donald Michie, W. T. Tutte, Bill Tutte and Stuart Milner-Barry. The team at Bletchley Park devised automatic machinery to help with decryption, culminating in the development of Colossus computer, Colossus, the world's first programmable digital electronic computer. Codebreaking operations at Bletchley Park ended in 1946 and al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
