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Barracouta-class Cruiser
The ''Barracouta''-class cruiser was a series of 4 third-class cruisers operated by the Royal Navy between 1890 and 1905. The ships were the first British cruisers to incorporate a number of features, such as an armored deck and quick-firing guns, as those designs were copied from other vessels. Two more vessels were built based on a lengthened version of the class. The ships mainly operated in the Mediterranean and British home waters before the entire class was scrapped. Development and design During the early 1880s, the Royal Navy worked to develop a new type of warship, known as the torpedo cruiser. Later designated as third-class cruisers, these vessels had the speed, size, and manuability to serve as a vanguard for ocean-going fleets of ironclads. In combat, doctrine called for the cruisers to sail ahead and engage enemy vessels, primarily torpedo boats, with their guns and underwater torpedo tubes. After several iterations of designs, the Navy was concerned that the cru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pembroke Dockyard
Pembroke Dockyard, originally called Pater Yard, is a former Royal Navy Dockyard in Pembroke Dock, Pembrokeshire, Wales. History It was founded in 1814, although not formally authorized until the Prince Regent signed the necessary Order in Council on 31 October 1815, and was known as ''Pater Yard'' until 1817. The Mayor of Pembroke had requested the change "in deference to the town of Pembroke some distant". The site selected for the dockyard was greenfield land and the closest accommodations were in Pembroke. Office space was provided by the old frigate after she was beached. The Royal Marine garrison was housed in the hulked 74-gun ship, , after she was run aground in 1832. Many of the workmen commuted by boat from nearby communities until Pembroke Dock town was built up. In 1860 the dockyard's policing was transferred to the new No. 4 Division of the Metropolitan Police, which remained in that role until the 1920s. After the end of the First World War, the docky ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Doctrine
Doctrine (from la, Wikt:doctrina, doctrina, meaning "teaching, instruction") is a codification (law), codification of beliefs or a body of teacher, teachings or instructions, taught principles or positions, as the essence of teachings in a given branch of knowledge or in a belief system. The Etymology of Tibet, etymological Greece, Greek analogue is "catechism". Often the word ''doctrine'' specifically suggests a body of religion, religious principles as promulgated by a church. ''Doctrine'' may also refer to a principle of law, in the common-law traditions, established through a history of past decisions. Religious usage Examples of religious doctrines include: * Christian theology: ** Doctrines such as the Trinity, the Virgin Birth (Christian doctrine), virgin birth and atonement in Christianity, atonement ** The Salvation Army ''Handbook of Doctrine'' **Transubstantiation and Mariology of the Catholic Church, Marian teachings in Roman Catholic theology. The department of th ... [...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 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 blade to the water at t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triple Expansion
A steam engine is a heat engine that performs mechanical work using steam as its working fluid. The steam engine uses the force produced by steam pressure to push a piston back and forth inside a cylinder. This pushing force can be transformed, by a connecting rod and crank, into rotational force for work. The term "steam engine" is generally applied only to reciprocating engines as just described, not to the steam turbine. Steam engines are external combustion engines, where the working fluid is separated from the combustion products. The ideal thermodynamic cycle used to analyze this process is called the Rankine cycle. In general usage, the term ''steam engine'' can refer to either complete steam plants (including boilers etc.), such as railway steam locomotives and portable engines, or may refer to the piston or turbine machinery alone, as in the beam engine and stationary steam engine. Although steam-driven devices were known as early as the aeolipile in the first ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coal
Coal is a combustible black or brownish-black sedimentary rock, formed as stratum, rock strata called coal seams. Coal is mostly carbon with variable amounts of other Chemical element, elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. Coal is formed when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years. Vast deposits of coal originate in former wetlands called coal forests that covered much of the Earth's tropical land areas during the late Carboniferous (Pennsylvanian (geology), Pennsylvanian) and Permian times. Many significant coal deposits are younger than this and originate from the Mesozoic and Cenozoic eras. Coal is used primarily as a fuel. While coal has been known and used for thousands of years, its usage was limited until the Industrial Revolution. With the invention of the steam engine, coal consumption increased. In 2020, coal supplied about a quarter of the world's primary energ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boiler
A boiler is a closed vessel in which fluid (generally water) is heated. The fluid does not necessarily boil. The heated or vaporized fluid exits the boiler for use in various processes or heating applications, including water heating, central heating, boiler-based power generation, cooking, and sanitation. Heat sources In a fossil fuel power plant using a steam cycle for power generation, the primary heat source will be combustion of coal, oil, or natural gas. In some cases byproduct fuel such as the carbon monoxide rich offgasses of a coke battery can be burned to heat a boiler; biofuels such as bagasse, where economically available, can also be used. In a nuclear power plant, boilers called steam generators are heated by the heat produced by nuclear fission. Where a large volume of hot gas is available from some process, a heat recovery steam generator or recovery boiler can use the heat to produce steam, with little or no extra fuel consumed; such a configuration i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Machine Gun
A machine gun is a fully automatic, rifled autoloading firearm designed for sustained direct fire with rifle cartridges. Other automatic firearms such as automatic shotguns and automatic rifles (including assault rifles and battle rifles) are typically designed more for firing short bursts rather than continuous firepower, and are not considered true machine guns. As a class of military kinetic projectile weapon, machine guns are designed to be mainly used as infantry support weapons and generally used when attached to a bipod or tripod, a fixed mount or a heavy weapons platform for stability against recoils. Many machine guns also use belt feeding and open bolt operation, features not normally found on other infantry firearms. Machine guns can be further categorized as light machine guns, medium machine guns, heavy machine guns, general purpose machine guns and squad automatic weapons. Similar automatic firearms of caliber or more are classified as aut ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Empire
The British Empire was composed of the dominions, colonies, protectorates, mandates, and other territories ruled or administered by the United Kingdom and its predecessor states. It began with the overseas possessions and trading posts established by England between the late 16th and early 18th centuries. At its height it was the largest empire in history and, for over a century, was the foremost global power. By 1913, the British Empire held sway over 412 million people, of the world population at the time, and by 1920, it covered , of the Earth's total land area. As a result, its constitutional, legal, linguistic, and cultural legacy is widespread. At the peak of its power, it was described as " the empire on which the sun never sets", as the Sun was always shining on at least one of its territories. During the Age of Discovery in the 15th and 16th centuries, Portugal and Spain pioneered European exploration of the globe, and in the process established ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Medina-class Gunboat
The ''Medina''-class gunboat was a class of 12 Royal Navy Rendel (or "flat-iron") gunboats mounting three 6.3-inch guns, built between 1876 and 1877. Flat-iron gunboats were normally built without masts or rigging, but the ''Medina''s carried a full barquentine rig. Their robust iron hulls meant that they lingered on as diving tenders, barges and lighters, with five of them working into the 1920s. The hull of ''Medway'' lies in shallow water in Bermuda and is visible on satellite imagery. Design The ''Medina'' class were a development of the Rendel (or "flat-iron") gunboat, a series of small vessels with low freeboards that mounted a small number of relatively large guns. Although the ''Medina''s were exceptionally provided with masts to extend their range and independence, in essence they were available for similar operations to their un-masted sisters; offensive action against shore defences. Their ungainly appearance led them to be described by the naval historian Antony Pres ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HMS Buzzard (1887)
HMS ''Buzzard'' was a ''Nymphe''-class composite screw sloop and the fourth ship of the Royal Navy to bear the name. Design Developed and constructed for the Royal Navy on a design by William Henry White, Director of Naval Construction, she was launched at Sheerness Dockyard on 10 May 1887. Foreign service The ''Nymphe''-class sloops were ideal for service in the far distant outposts of the British Empire, and ''Buzzard'' was employed on the North America and West Indies Station. In early April 1902, under the command of Commander Leicester Francis Gartside Tippinge (1855–1938), she left Bermuda for home waters, calling at Faial Island, before she arrived at Devonport on 20 April. She was paid off at Chatham on 13 May 1902. Harbour training ship In 1904 she was converted to a drill ship for the Royal Naval Volunteer Reserve Royal may refer to: People * Royal (name), a list of people with either the surname or given name * A member of a royal family Pl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Knot (unit)
The knot () is a unit of speed equal to one nautical mile per hour, exactly (approximately or ). The ISO standard symbol for the knot is kn. The same symbol is preferred by the Institute of Electrical and Electronics Engineers ( IEEE), while kt is also common, especially in aviation, where it is the form recommended by the International Civil Aviation Organization (ICAO). The knot is a non- SI unit. The knot is used in meteorology, and in maritime and air navigation. A vessel travelling at 1 knot along a meridian travels approximately one minute of geographic latitude in one hour. Definitions ;1 international knot = :1 nautical mile per hour (by definition), : (exactly), : (approximately), : (approximately), : (approximately) : (approximately). The length of the internationally agreed nautical mile is . The US adopted the international definition in 1954, having previously used the US nautical mile (). The UK adopted the international nautical mile definition in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HMS Curlew (1885)
The ''Curlew''-class torpedo gunboat consisted of two "gun and torpedo vessels" operated by the Royal Navy between 1886 and 1906. Designed to be a torpedo cruiser the size of a gunvessel, the ships had a miserable career as the design was too slow and uneconomical for intended use. Regardless, the class served as the basis for further designs by the Royal Navy due to their novel roles. Due to their unique design, the ships have also been referred to as sloops or gunvessels. Development and design During the early 1880s, the Royal Navy worked to develop a new type of warship, known as the torpedo cruiser. Later designated as third-class cruisers, these vessels had the speed, size, and maneuverability to serve as a vanguard for ocean-going fleets of ironclads. In combat, doctrine called for the cruisers to sail ahead and engage enemy vessels, primarily torpedo boats, with their guns and underwater torpedo tubes. After initial iterations of designs, the Navy was interested in making ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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