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Pollux (1900)
''Pollux'' was a Polish tugboat from the interwar period. Built in 1900 at a German shipyard, likely in Gdańsk, it was acquired by Poland in spring 1920. From 1920 to 1922, it served in the Polish Navy, then transitioned to civilian use. In 1925, the tugboat was put up for sale and purchased by an shipowner from the Free City of Danzig. It remained in use at least until 1943, after which its fate is unknown. Alongside the concurrently acquired '' Castor'', ''Pollux'' was one of the first tugboats in the Polish fleet. History Following the acquisition of Pomerelia, granted to Poland by the Treaty of Versailles, which included only two small fishing ports – Hel and Puck – efforts were made to procure auxiliary vessels, as only a number of boats, fishing smacks, and merchant sailing vessels were inherited. The newly established Polish Navy, set to receive six former German torpedo boats as decided by the Conference of Ambassadors, required tugboats to assist in navigating sh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
German Empire
The German Empire (),; ; World Book, Inc. ''The World Book dictionary, Volume 1''. World Book, Inc., 2003. p. 572. States that Deutsches Reich translates as "German Realm" and was a former official name of Germany. also referred to as Imperial Germany, the Second Reich or simply Germany, was the period of the German Reich; . from the unification of Germany in 1871 until the German revolution of 1918–1919, November Revolution in 1918, when the German Reich changed its form of government from a monarchy to a Weimar Republic, republic. The German Empire consisted of States of the German Empire, 25 states, each with its own nobility: four constituent Monarchy, kingdoms, six Grand duchy, grand duchies, five Duchy, duchies (six before 1876), seven Principality, principalities, three Free imperial city, free Hanseatic League, Hanseatic City-state, cities, and Alsace–Lorraine, one imperial territory. While Prussia was one of four kingdoms in the realm, it contained about two-thirds ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Torpedo Boat
A torpedo boat is a relatively small and fast naval ship designed to carry torpedoes into battle. The first designs were steam-powered craft dedicated to ramming enemy ships with explosive spar torpedoes. Later evolutions launched variants of self-propelled Whitehead torpedoes. These were inshore craft created to counter both the threat of battleships and other slow and heavily armed ships by using speed, agility, and powerful torpedoes, and the overwhelming expense of building a like number of capital ships to counter an enemy. A swarm of expendable torpedo boats attacking en masse could overwhelm a larger ship's ability to fight them off using its large but cumbersome guns. A fleet of torpedo boats could pose a similar threat to an adversary's capital ships, albeit only in the coastal areas to which their small size and limited fuel load restricted them. The introduction of fast torpedo boats in the late 19th century was a serious concern to the era's naval strategists, i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cylinder (engine)
In an engine, the cylinder is the space in which a piston travels. The inner surface of the cylinder is formed from either a thin metallic liner (also called "sleeve") or a surface coating applied to the engine block. A piston is seated inside each cylinder by several metal piston rings, which also provide seals for compression and the lubricating oil. The piston rings do not actually touch the cylinder walls, instead they ride on a thin layer of lubricating oil. Steam engines The cylinder in a steam engine is made pressure-tight with end covers and a piston; a valve distributes the steam to the ends of the cylinder. Cylinders were cast in cast iron and later in steel. The cylinder casting can include other features such as valve ports and mounting feet. Internal combustion engines The cylinder is the space through which the piston travels, propelled by the energy generated from the combustion of the air/fuel mixture in the combustion chamber. In an air-cooled e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Net Register Tonnage
Net register tonnage (NRT, nrt, n.r.t.) is a ship's cargo volume capacity expressed in "register tons", one of which equals to a volume of . It is calculated by subtracting non-revenue-earning spaces i.e. spaces not available for carrying cargo, for example engine rooms, fuel tanks and crew quarters, from the ship's gross register tonnage.Units and Systems of Measurement Their Origin, Development, and Present Status . National Institute of Standards and Technology. Net tonnage is thus used in situations where a vessel's earning capacity is important, rather than its mere size. Net register tonnage is not a measure of the weight of the ship or its cargo, and should not be confused with terms such as |
Draft (hull)
The draft or draught of a ship is a determined depth of the vessel below the waterline, measured vertically to its hull's lowest—its propellers, or keel, or other reference point. Draft varies according to the loaded condition of the ship. A deeper draft means the ship will have greater vertical depth below the waterline. Draft is used in under keel clearance calculations, where the draft is calculated with the available depth of water (from Electronic navigational charts) to ensure the ship can navigate safely, without grounding. Navigators can determine their draught by calculation or by visual observation (of the ship's painted load lines). Related terminology A ship's draft/draught is the "depth of the vessel below the waterline measured vertically to the lowest part of the hull, propellers, or other reference point". That is, the draft or draught is the maximum depth of any part of the vessel, including appendages such as rudders, propellers and drop keels if de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beam (nautical)
The beam of a ship is its width at its widest point. The maximum beam (BMAX) is the distance between planes passing through the outer sides of the ship, beam of the hull (BH) only includes permanently fixed parts of the hull, and beam at waterline (BWL) is the maximum width where the hull intersects the surface of the water. Generally speaking, the wider the beam of a ship (or boat), the more initial stability it has, at the expense of secondary stability in the event of a capsize, where more energy is required to right the vessel from its inverted position. A ship that heels on her ''beam ends'' has her deck beams nearly vertical. Typical values Typical length-to-beam ratios ( aspect ratios) for small sailboats are from 2:1 (dinghies to trailerable sailboats around ) to 5:1 (racing sailboats over ). Large ships have widely varying beam ratios, some as large as 20:1. Rowing shells designed for flatwater racing may have length to beam ratios as high as 30:1, while a cora ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Overall Length
The overall length (OAL) of an ammunition cartridge is a measurement from the base of the brass shell casing to the tip of the bullet, seated into the brass casing. Cartridge overall length, or "COL", is important to safe functioning of reloads in firearms. Handloaded cartridges and commercially available cartridges for firearms are normally created with a maximum length standardized by the Sporting Arms and Ammunition Manufacturers' Institute (SAAMI). A cartridge's overall length may be shorter than the maximum standard, equal to the standard, or sometimes even longer. The maximum overall length is dictated by the need to fit into a box magazine of standard manufacture. For example, the .223 Remington cartridge, when loaded for use in the AR-15 rifle (or the military's M16 rifle), has to fit into the removable box magazine for that rifle. This dictates that the cartridge's maximum overall length be no greater than 2.260". However, for competition purposes during off-hand and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leda (mythology)
In Greek mythology, Leda (; Ancient Greek: Λήδα ), also rendered Lede, was an Aetolian princess who became queen consort of Sparta through her marriage to King Tyndareus. Zeus fell in love with Leda, and to avoid his wife Hera's jealousy, raped her while disguised as a swan. Leda was named as the mother of four famous children in Greek mythology: Helen of Troy, Clytemnestra, and the twins Castor and Pollux. Leda and the Swan was a popular motif in the visual arts, particularly during the Renaissance. Family Leda is most commonly named as a daughter of the Aetolian king Thestius,Apollodorus, ''Library''3.10/ref>Euripides, ''Iphigenia in Aulis''49/ref> son of Ares, and was occasionally referred to as Thestias. Her mother is disputed, and could have been Leucippe,Hyginus, ''Fabulae''14.3/ref> Deidameia, daughter of Perieres, Eurythemis, daughter of Cleoboea,Apollodorus, ''Library''1.7.10/ref> or Laophonte, daughter of Pleuron.Alcman, fr .15 as cited in Scholia on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zeus
Zeus (, ) is the chief deity of the List of Greek deities, Greek pantheon. He is a sky father, sky and thunder god in ancient Greek religion and Greek mythology, mythology, who rules as king of the gods on Mount Olympus. Zeus is the child of Cronus and Rhea (mythology), Rhea, the youngest of his siblings to be born, though sometimes reckoned the eldest as the others required disgorging from Cronus's stomach. In most traditions, he is married to Hera, by whom he is usually said to have fathered Ares, Eileithyia, Hebe (mythology), Hebe, and Hephaestus.Hard 2004p. 79 At the oracle of Dodona, his consort was said to be Dione (Titaness/Oceanid), Dione, by whom the ''Iliad'' states that he fathered Aphrodite. According to the ''Theogony'', Zeus's first wife was Metis (mythology), Metis, by whom he had Athena.Hesiod, ''Theogony'886900 Zeus was also infamous for his erotic escapades. These resulted in many divine and heroic offspring, including Apollo, Artemis, Hermes, Persephone, D ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Greek Mythology
Greek mythology is the body of myths originally told by the Ancient Greece, ancient Greeks, and a genre of ancient Greek folklore, today absorbed alongside Roman mythology into the broader designation of classical mythology. These stories concern the ancient Greek religion's view of the Cosmogony, origin and Cosmology#Metaphysical cosmology, nature of the world; the lives and activities of List of Greek deities, deities, Greek hero cult, heroes, and List of Greek mythological creatures, mythological creatures; and the origins and significance of the ancient Greeks' cult (religious practice), cult and ritual practices. Modern scholars study the myths to shed light on the religious and political institutions of ancient Greece, and to better understand the nature of mythmaking itself. The Greek myths were initially propagated in an oral tradition, oral-poetic tradition most likely by Minoan civilization, Minoan and Mycenaean Greece, Mycenaean singers starting in the 18th century&n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ministry Of Military Affairs (Poland)
The Ministry of National Defence (Polish: ''Ministerstwo Obrony Narodowej'' '', MON'' ) is a office of government in Poland headed by the Minister of National Defence. It is responsible for the organisation and management of the Polish Armed Forces. During the Second Polish Republic and World War II it was called the Ministry of Military Affairs (''Ministerstwo Spraw Wojskowych''). Ministry budget for 2022 was 140 billion PLN. History The beginning of the Ministry of Defence's operations is connected with the 1775 establishment of the Military Department within the Permanent Council. In 1789, the Military Commission of the Polish–Lithuanian Commonwealth was established, and from the Constitution of 3 May 1791 was under the Guardians of the Laws. Between 1793-94, the department was restored in the Supreme National Council. When Warsaw became part of the Kingdom of Prussia after the Third Partition of Poland in 1795), the Prussian Ministry of War headquarters was moved into t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
