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Admiralty M-N Scheme
'The Admiralty M-N Scheme' (sometimes given as "Project M-N") was a World War I British plan to close the Strait of Dover in the English Channel to German U-boats, by means of a chain of either eight or twelve massive towers linked by anti-submarine booms and nets. Only two towers had been constructed before the Armistice with Germany caused the cancellation of the project. Origin On 31 January 1917, it was announced to the German Reichstag that unrestricted submarine warfare would resume the next day, 1 February. The renewed U-boat campaign was initially a great success; nearly 500,000 tons of shipping being sunk in both February and March, and 860,000 tons in April, when Britain's reserve of wheat fell to 6 weeks' supply. The British Admiralty redoubled its efforts to find effective remedy. Attention turned to the Strait of Dover, which was used by U-boats based in Bruges in occupied Belgium, to gain fast access to the Atlantic trade routes and the busy Western Approaches. If ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World War I
World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was List of wars and anthropogenic disasters by death toll, one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fighting occurring throughout Europe, the Middle East, Africa, the Pacific Ocean, Pacific, and parts of Asia. An estimated 9 million soldiers were killed in combat, plus another 23 million wounded, while 5 million civilians died as a result of military action, hunger, and disease. Millions more died in Genocides in history (World War I through World War II), genocides within the Ottoman Empire and in the Spanish flu, 1918 influenza pandemic, which was exacerbated by the movement of combatants during the war. Prior to 1914, the European great powers were divided between the Triple Entente (comprising French Third Republic, France, Russia, and British Empire, Britain) and the Triple A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Naval Mine
A naval mine is a self-contained explosive device placed in water to damage or destroy surface ships or submarines. Unlike depth charges, mines are deposited and left to wait until they are triggered by the approach of, or contact with, any vessel or a particular vessel type, akin to anti-infantry vs. anti-vehicle mines. Naval mines can be used offensively, to hamper enemy shipping movements or lock vessels into a harbour; or defensively, to protect friendly vessels and create "safe" zones. Mines allow the minelaying force commander to concentrate warships or defensive assets in mine-free areas giving the adversary three choices: undertake an expensive and time-consuming minesweeping effort, accept the casualties of challenging the minefield, or use the unmined waters where the greatest concentration of enemy firepower will be encountered. Although international law requires signatory nations to declare mined areas, precise locations remain secret; and non-complying indivi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Royal Engineer
The Corps of Royal Engineers, usually called the Royal Engineers (RE), and commonly known as the ''Sappers'', is a corps of the British Army. It provides military engineering and other technical support to the British Armed Forces and is headed by the Chief Royal Engineer. The Regimental Headquarters and the Royal School of Military Engineering are in Chatham in Kent, England. The corps is divided into several regiments, barracked at various places in the United Kingdom and around the world. History The Royal Engineers trace their origins back to the military engineers brought to England by William the Conqueror, specifically Bishop Gundulf of Rochester Cathedral, and claim over 900 years of unbroken service to the crown. Engineers have always served in the armies of the Crown; however, the origins of the modern corps, along with those of the Royal Artillery, lie in the Board of Ordnance established in the 15th century. In Woolwich in 1716, the Board formed the Royal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Galvanometer
A galvanometer is an electromechanical measuring instrument for electric current. Early galvanometers were uncalibrated, but improved versions, called ammeters, were calibrated and could measure the flow of current more precisely. A galvanometer works by deflecting a pointer in response to an electric current flowing through a coil in a constant magnetic field. Galvanometers can be thought of as a kind of actuator. Galvanometers came from the observation, first noted by Hans Christian Ørsted in 1820, that a magnetic compass's needle deflects when near a wire having electric current. They were the first instruments used to detect and measure small amounts of current. André-Marie Ampère, who gave mathematical expression to Ørsted's discovery, named the instrument after the Italian electricity researcher Luigi Galvani, who in 1791 discovered the principle of the frog galvanoscope – that electric current would make the legs of a dead frog jerk. Galvanometers have been ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William McLellan (Scottish Electrical Engineer)
Colonel William McLellan CBE (1874–1934) was a Scottish electrical engineer. Born in Palnackie, McLellan joined Charles Merz in 1902 to form the Merz & McLellan Merz and McLellan was a leading British electrical engineering consultancy based in Newcastle. History The firm was founded by Charles Merz and William McLellan in Newcastle upon Tyne in 1902 when McLellan joined Merz's existing firm establish ... consulting partnership. In the 1920s, then Colonel McLellan, he designed the Galloway Hydros hydroelectric power scheme. References''Power from the Water'', Galloway Hydro website [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
T G Menzies
T, or t, is the twentieth letter in the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ''tee'' (pronounced ), plural ''tees''. It is derived from the Semitic Taw 𐤕 of the Phoenician and Paleo-Hebrew script (Aramaic and Hebrew Taw ת/𐡕/, Syriac Taw ܬ, and Arabic ت Tāʼ) via the Greek letter τ (tau). In English, it is most commonly used to represent the voiceless alveolar plosive, a sound it also denotes in the International Phonetic Alphabet. It is the most commonly used consonant and the second most commonly used letter in English-language texts. History '' Taw'' was the last letter of the Western Semitic and Hebrew alphabets. The sound value of Semitic ''Taw'', Greek alphabet Tαυ (''Tau''), Old Italic and Latin T has remained fairly constant, representing in each of these; and it has also kept its original basic shape in most of these alphabets. Use in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrophone
A hydrophone ( grc, ὕδωρ + φωνή, , water + sound) is a microphone designed to be used underwater for recording or listening to underwater sound. Most hydrophones are based on a piezoelectric transducer that generates an electric potential when subjected to a pressure change, such as a sound wave. Some piezoelectric transducers can also serve as a sound projector, but not all have this capability, and some may be destroyed if used in such a manner. A hydrophone can detect airborne sounds, but will be insensitive 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 that 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 due to the similarly bad acoustic impedance match. History Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cap Gris Nez
Cap Gris-Nez (literally "cape grey nose"; ) is a cape on the Côte d'Opale in the Pas-de-Calais ''département'' in northern France. The 'Cliffs of the Cape' is the closest point of France to England – from their English counterparts at Dover. Etymology ''Gris-nez'' literally means "grey nose" in English. It is derived from colloquial Dutch "grey cape"; officially, the Dutch name was ''Swartenesse'' ("black cape") to set it apart from ''Blankenesse'' "white cape" (Cap Blanc-Nez) to the northeast. The element ''-nesse'' is cognate to English '' -ness'', denoting "headland", as in for example Dungeness or Sheerness. Geology The cliffs of Cap Gris-Nez are made of sandstone, clay and chalk. They are mainly grey, which gives the cape its name. It is also a popular place to collect fossils, which are mainly from the Jurassic period. Common fossils include bivalves, gastropods and wood. In the sandstone layers with small pebbles, one can find teeth of fish and reptiles. So ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Folkestone
Folkestone ( ) is a port town on the English Channel, in Kent, south-east England. The town lies on the southern edge of the North Downs at a valley between two cliffs. It was an important harbour and shipping port for most of the 19th and 20th centuries. There has been a settlement in this location since the Mesolithic era. A nunnery was founded by Eanswith, granddaughter of Æthelberht of Kent in the 7th century, who is still commemorated as part of the town's culture. During the 13th century it subsequently developed into a seaport and the harbour developed during the early 19th century to provide defence against a French invasion. Folkestone expanded further west after the arrival of the railway in 1843 as an elegant coastal resort, thanks to the investment of the Earl of Radnor under the urban plan of Decimus Burton. In its heyday - during the Edwardian era - Folkestone was considered the most fashionable resort of the time, visited by royalties - amongst them Queen Vic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alexander Gibb
Alexander is a male given name. The most prominent bearer of the name is Alexander the Great, the king of the Ancient Greek kingdom of Macedonia who created one of the largest empires in ancient history. Variants listed here are Aleksandar, Aleksander and Aleksandr. Related names and diminutives include Iskandar, Alec, Alek, Alex, Alexandre, Aleks, Aleksa and Sander; feminine forms include Alexandra, Alexandria, and Sasha. Etymology The name ''Alexander'' originates from the (; 'defending men' or 'protector of men'). It is a compound of the verb (; 'to ward off, avert, defend') and the noun (, genitive: , ; meaning 'man'). It is an example of the widespread motif of Greek names expressing "battle-prowess", in this case the ability to withstand or push back an enemy battle line. The earliest attested form of the name, is the Mycenaean Greek feminine anthroponym , , (/Alexandra/), written in the Linear B syllabic script. Alaksandu, alternatively called ''Alakasandu'' o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Battle Of Dover Strait (1917)
The Second Battle of Dover Strait was a naval battle of the First World War, fought in the Dover Strait in April 1917 and should not be confused with the major Battle of Dover Strait in 1916. Two Royal Navy destroyers defeated a superior force of German '' Kaiserliche Marine'' torpedo boats. Two German torpedo boats were sunk; the British suffered damage to both destroyers. Background On 20 April 1917, two groups of torpedo boats of the German Navy raided the Dover Strait to bombard Allied positions on shore and to engage warships patrolling the Dover Barrage— the field of floating mines that prevented German ships from getting into the English Channel. Six torpedo boats bombarded Calais and another six bombarded Dover just before midnight. Battle Two flotilla leaders of the Royal Navy — and — were on patrol near Dover and engaged six of the German ships early on 21 April near the Goodwin Sands. In a confusing action, ''Swift'' torpedoed . ''Broke'' rammed , and t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Battle Of Dover Strait (1916)
The Battle of Dover Strait that occurred on 26–27 October 1916 was a naval battle of the First World War between Great Britain and the German Empire. Two and a half flotillas of German torpedo boats from the Flanders Flotilla launched a raid into the Dover Strait in an attempt to disrupt the Dover Barrage and destroy whatever Allied shipping could be found in the strait. Upon approaching the barrage, the German torpedo boats were challenged by the British destroyer and an engagement broke out. The Germans were able to destroy ''Flirt'' and successfully assault the barrage's drifters, but were once more engaged when a flotilla of British destroyers was sent to repel them. The Germans were able to fight off the additional British units before successfully withdrawing. By the end of the night, the British had lost one destroyer, a transport, and several drifters while the Germans themselves suffered only minor damage to a single torpedo boat. Background In October 1916, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
