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Naïade-class Submarine
The ''Naïade''-class submarines, sometimes referred to as the ''Perle'' classJane, p. 135. were a group of submarines built for the French Navy at the beginning of the 20th century. There were twenty vessels in this class, which was designed by Gaston Romazotti. The class introduced internal combustion engines into French submarine design. They remained in service until just prior to the outbreak of the First World War. Design and description The ''Naïade''s were designed by Gaston Romazotti, an early French submarine engineer and director of the Arsenal de Cherbourg. They were of a single-hull design, following most previous French submarine designs, but with dual propulsion.Gardiner & Gray p. 207. The hull was constructed of Roma-bronze, a copper alloy devised by Romazotti to resist corrosion and reduce interference with the boat's magnetic compass; it was also believed to offer more flexibility at depth. The ''Naïade'' design was based on the first French submarine, . The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
French Franc
The franc (, ; sign: F or Fr), also commonly distinguished as the (FF), was a currency of France. Between 1360 and 1641, it was the name of coins worth 1 livre tournois and it remained in common parlance as a term for this amount of money. It was reintroduced (in decimal form) in 1795. After two centuries of inflation, it was redenominated in 1960, with each (NF) being worth 100 old francs. The NF designation was continued for a few years before the currency returned to being simply the franc. Many French residents, though, continued to quote prices of especially expensive items in terms of the old franc (equivalent to the new centime), up to and even after the introduction of the euro (for coins and banknotes) in 2002. The French franc was a commonly held international reserve currency of reference in the 19th and 20th centuries. Between 1998 and 2002, the conversion of francs to euros was carried out at a rate of 6.55957 francs to 1 euro. History The French Franc tr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Propeller
A propeller (colloquially often called a screw if on a ship or an airscrew if on an aircraft) is a device with a rotating hub and radiating blades that are set at a pitch to form a helical spiral which, when rotated, exerts linear thrust upon a working fluid such as water or air. Propellers are used to pump fluid through a pipe or duct, or to create thrust to propel a boat through water or an aircraft through air. The blades are specially shaped so that their rotational motion through the fluid causes a pressure difference between the two surfaces of the blade by Bernoulli's principle which exerts force on the fluid. Most marine propellers are screw propellers with helical blades rotating on a propeller shaft (ship), propeller shaft with an approximately horizontal axis. History Early developments The principle employed in using a screw propeller is derived from sculling. In sculling, a single blade is moved through an arc, from side to side taking care to keep presenting the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lynx
A lynx is a type of wild cat. Lynx may also refer to: Astronomy * Lynx (constellation) * Lynx (Chinese astronomy) * Lynx X-ray Observatory, a NASA-funded mission concept for a next-generation X-ray space observatory Places Canada * Lynx, Ontario, an unincorporated place and railway point * Lynx Mountain, in the Canadian Rockies * Lynx Lake (Northwest Territories) * Lynx Formation, a stratigraphical unit in western Canada United States * Lynx, Ohio, a census-designated place * Lynx Lake (Arizona), a reservoir Antarctica * Lynx Rocks, South Shetland Islands, Antarctica Transport Vehicles * Leyland Lynx, a model of single-decker bus produced by British Leyland in the 1980s and 1990s * Mercury Lynx, a model of car * Mitsubishi Lynx, a 1993 Mitsubishi Motors concepts, Mitsubishi Motors concept car * GWR no. 2109 Lynx, a South Devon Railway Eagle class steam locomotive * Lynx (tall ship), ''Lynx'' (tall ship), an interpretation of the 1812 privateer schooner, launched in 2001 * Lyn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cartesian Diver
A Cartesian diver or Cartesian devil is a classic science experiment which demonstrates the principle of buoyancy ( Archimedes' principle) and the ideal gas law. The first written description of this device is provided by Raffaello Magiotti, in his book (Very firm resistance of water to compression) published in 1648. It is named after René Descartes as the toy it is said to have been invented by him. The principle is used to make small toys often called "water dancers" or "water devils". The principle is the same, but the eyedropper is instead replaced with a decorative object with the same properties which is a tube of near-neutral buoyancy, for example, a blown-glass bubble. If the tail of the glass bubble is given a twist, the flow of the water into and out of the glass bubble creates spin. This causes the toy to spin as it sinks and rises. An example of such a toy is the red "devil" shown here. The device also has a practical use for measuring the pressure of a liquid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Otter
Otters are carnivorous mammals in the subfamily Lutrinae. The 13 extant otter species are all semiaquatic, aquatic, or marine, with diets based on fish and invertebrates. Lutrinae is a branch of the Mustelidae family, which also includes weasels, badgers, mink, and wolverines, among other animals. Etymology The word ''otter'' derives from the Old English word or . This, and cognate words in other Indo-European languages, ultimately stem from the Proto-Indo-European language root , which also gave rise to the English word "water". Terminology An otter's den is called a holt or couch. Male otters are called dogs or boars, females are called bitches or sows, and their offspring are called pups or cubs. The collective nouns for otters are bevy, family, lodge, romp (being descriptive of their often playful nature) or, when in water, raft. The feces of otters are typically identified by their distinctive aroma, the smell of which has been described as ranging from freshly ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Robin
Prionotinae is a subfamily of demersal, marine ray-finned fishes, part of the family Triglidae. The fishes in this subfamily are called sea robins and are found in the Western Atlantic and Eastern Pacific Oceans, the other two Triglid subfamilies are called gurnards. Taxonomy Prionotinae was first proposed as a subfamily in 1873 by the German naturalist Johann Jakob Kaup. It is classified within the family Triglidae, part of the suborder Platycephaloidei within the order Scorpaeniformes. Prionotinae is regarded as the basal grouping within the family Triglidae. Etymology The name of the subfamily is derived from what was its only genus at the time of its delineation by Kaup, ''Prionotus''. This name is a compound of ''prion'', “saw”, and ''notus'', “back”, as Lacépède saw three free dorsal spines when he was describing the type species '' P. evolans'' but these were probably the result of damage to the specimen. The common names, sea robin, comes from the oran ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sturgeon
Sturgeon is the common name for the 27 species of fish belonging to the family Acipenseridae. The earliest sturgeon fossils date to the Late Cretaceous The Late Cretaceous (100.5–66 Ma) is the younger of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after ''creta'', the ..., and are descended from other, earlier Acipenseriformes, acipenseriform fish, which date back to the Early Jurassic period, some 174 to 201 million years ago. They are one of two living families of the Acipenseriformes alongside paddlefish (Polyodontidae). The family is grouped into four genera: ''Acipenser'' (which is paraphyletic, containing many distantly related sturgeon species), ''Huso'', ''Scaphirhynchus,'' and ''Pseudoscaphirhynchus''. Two species (''Adriatic sturgeon, A. naccarii'' and ''Dabry's sturgeon, A. dabryanus'') may be extinct in the wild, and one (''Syr Darya s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dolphinfish
''Coryphaena'' is a genus of marine ray-finned fishes known as the dolphinfishes, and is currently the only known genus in the family Coryphaenidae. The generic name is from Greek κορυφή (''koryphē'', "crown, top") and -αινα (-''aina'', feminine suffix). Species in this genus have compressed heads and single dorsal fins that run the entire length of the fishes' bodies. Dolphinfish are aggressive predatory fish that actively prey upon oceanic forage fishes, while in turn serving as a primary food source for many larger pelagic predators. The dolphinfish can reach up to about , and are some of the fastest-growing species in the ocean. Despite the name, dolphinfishes are unrelated to and look unlike dolphins (which are marine mammals with pointed snouts), and commercially their meat is often labeled with its Hawaiian name mahi-mahi to reduce possible public confusion. The origin of the name "dolphinfish" is recent, to avoid confusion with dolphins, as the traditional nam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arsenal De Rochefort
The Arsenal de Rochefort was a French naval base and dockyard in the town of Rochefort. It was founded in 1665 and it was closed in 1926. In December 1665 Rochefort was chosen by Jean-Baptiste Colbert as a place of "refuge, defense and supply" for the French Navy. Its military harbour was fortified by Louis XIV's Commissary of Fortifications Sébastien Le Prestre de Vauban. Between 1666 and 1669 the King had the ''Corderie Royale'' (then the longest building in Europe) constructed to make cordage for French ships of war. The making of cordage ceased in 1867 and in 1926 the Arsenal de Rochefort was closed. Gallery Porte arsenalRochefort.jpg, Tor 02.JPG, Rochefort Corderie vue sud1.JPG, Fête de la sortie sur la Charente de la coque de la frégate L' Hermione (1).JPG, Forme double Rochefort.jpg, Rochefort radoub porte.JPG, Drapeau de la ville de Rochefort-sur-Mer (18).JPG, Tor 08.JPG, See also * Raid on Rochefort, a 1757 British raid on Rochefort during the Seven Y ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Castor (genus)
Castor most commonly refers to: *Castor (star), a star in the Gemini constellation *Castor, one of the Dioscuri/Gemini twins Castor and Pollux in Greco-Roman mythology Castor or CASTOR may also refer to: Science and technology *Castor (rocket stage), a family of solid-fuel rocket stages *Castor (framework), Castor (software), data binding framework for Java *CASTOR (nuclear waste), ''CASTOR'' (nuclear waste), cask for storage and transport of radioactive material *CASTOR experiment, ''CASTOR'' experiment, "Centauro and Strange Object Research" at CERN *CASTOR (spacecraft), proposed space telescope *Castor sugar, fine sugar *Caster, Caster (or Castor), an undriven wheel *Caster angle, Caster (or Castor) angle, relevant to a steered wheel Biology *Castor oil plant, plant from which castor bean grows **Castor oil, oil of the castor bean **Castor wax, produced from castor oil *''Castor'', a genus name of the beaver **Castoreum, natural scent derived from the beaver People Given nam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bonito
Bonitos are a tribe of medium-sized, ray-finned predatory fish in the family Scombridae – a family it shares with the mackerel, tuna, and Spanish mackerel tribes, and also the butterfly kingfish. Also called the tribe Sardini, it consists of eight species across four genera; three of those four genera are monotypic, having a single species each. Bonitos closely resemble the skipjack tuna, which is often called a bonito, especially in Japanese contexts. Etymology The fish's name comes from the Spanish ''bonito'' 'pretty'.''Oxford English Dictionary'', 3rd edition, 2018''s.v.''/ref> An older theory suggests that it comes from an Arabic word ''bainīth'', but that may have been derived from Spanish as well. Species * Genus '' Sarda'' ( Cuvier, 1832) ** Australian bonito, ''S. australis'' (Macleay, 1881) ** '' Sarda chiliensis'' (Cuvier, 1832) *** Eastern Pacific bonito, ''S. c. chiliensis'' (Cuvier, 1832) *** Pacific bonito, ''S. c. lineolata'' ( Girard, 1858) ** Striped b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Navy List
A Navy Directory, formerly the Navy List or Naval Register is an official list of naval officers, their ranks and seniority, the ships which they command or to which they are appointed, etc., that is published by the government or naval authorities of a country. Background The Navy List fulfills an important function in international law in that warships are required by article 29 of the United Nations Convention on the Law of the Sea to be commanded by a commissioned officer whose name appears in the appropriate service list. Past copies of the Navy List are also important sources of information for historians and genealogists. The Navy List for the Royal Navy is no longer published in hard-copy. The Royal Navy (United Kingdom) publishes annual lists of active and reserve officers, and biennial lists of retired officers. As of 2015, the Navy List of the Royal Navy has been renamed as the 'Navy Directory'. The equivalent in the United States Navy is the Naval Register, whic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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