|
Ballistae
The ballista (Latin, from Ancient Greek, Greek βαλλίστρα ''ballistra'' and that from βάλλω ''ballō'', "throw"), plural ballistae or ballistas, sometimes called bolt thrower, was an Classical antiquity, ancient missile weapon that launched either Crossbow_bolt, bolts or stones at a distant target. Developed from earlier Greek weapons, it relied upon different mechanics, using two levers with torsion springs instead of a tension prod (the bow part of a modern crossbow). The springs consisted of several loops of twisted Hank (textile), skeins. Early versions projected heavy dart (missile), darts or spherical stone projectiles of various sizes for siege warfare. It developed into a smaller precision weapon, the ''Scorpio (weapon), scorpio'', and possibly the ''polybolos''. Greek weapon The early ballistae in Ancient Greece were developed from two weapons called oxybeles and gastraphetes. The gastraphetes ('belly-bow') was a handheld crossbow. It had a composite p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crossbow
A crossbow is a ranged weapon using an Elasticity (physics), elastic launching device consisting of a Bow and arrow, bow-like assembly called a ''prod'', mounted horizontally on a main frame called a ''tiller'', which is hand-held in a similar fashion to the stock (firearms), stock of a long gun. Crossbows shoot arrow-like projectiles called ''crossbow bolt, bolts'' or ''quarrels''. A person who shoots crossbow is called a ''crossbowman'', an ''arbalister'' or an ''arbalist (crossbowman), arbalist'' (after the arbalest, a European crossbow variant used during the 12th century). Crossbows and bows use the same elastic launch principles, but differ in that an archer using a Bow and arrow, bow must draw-and-shoot in a quick and smooth motion with limited or no time for aiming, while a crossbow's design allows it to be spanned and cocked ready for use at a later time and thus affording them unlimited time to aim. When shooting bows, the archer must fully perform the bow draw, draw, h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scorpio (weapon)
The ''scorpio'' or scorpion was a type of Roman torsion siege engine and field artillery piece. It was described in detail by the early-imperial Roman architect and engineer Vitruvius in the 1st century BC and by the 4th century AD officer and historian Ammianus Marcellinus. Ammianus Marcellinus, Roman History' Design Two versions are known: a horizontal two-armed variety like a ballista and a one-armed, vertical version otherwise referred to as an ''onager''. The scorpion was made of a ground frame made of two beams joined together with crossbeams. Spring holes were drilled into the sides of the beams to allow for ropes to be placed in, thus allowing them to serve as sinew-springs. This gave the weapon more power. An arm made of wood known as the ''stilus'', with iron hooks at the end, was used to hold the stone or bolt which was to be fired. The fourth century army officer and historian Ammianus Marcellinus witnessed the use of ''scorpiones'' during several engagements ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Universal Joint
A universal joint (also called a universal coupling or U-joint) is a joint or coupling connecting rigid shafts whose axes are inclined to each other. It is commonly used in shafts that transmit rotary motion. It consists of a pair of hinges located close together, oriented at 90° to each other, connected by a cross shaft. The universal joint is not a constant-velocity joint. U-joints are also sometimes called by various eponymous names, as follows: * Cardan joint, after Gerolamo Cardano, a polymath of the 16th century who contributed to knowledge of various clever mechanisms, including gimbals * Hooke joint or Hooke's joint, after Robert Hooke, a polymath of the 17th century who contributed to knowledge of various clever mechanisms * Spicer joint, after Clarence W. Spicer and the Spicer Manufacturing Company, who manufactured U joints * Hardy Spicer joint, after the Hardy Spicer brand, a successor to the Spicer brand History The main concept of the universal joi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siege Tower
A Roman siege tower or breaching tower (or in the Middle Ages, a belfry''Castle: Stephen Biesty's Cross-Sections''. Dorling Kindersley Pub (T); 1st American edition (September 1994). Siege towers were invented in 300 BC. ) is a specialized siege engine, constructed to protect assailants and ladders while approaching the defensive walls of a fortification. The tower was often rectangular with four wheels with its height roughly equal to that of the wall or sometimes higher to allow archery, archers or crossbowmen to stand on top of the tower and shoot arrows or quarrels into the fortification. Because the towers were wooden and thus flammable, they had to have some non-flammable covering of iron or fresh animal skins. Evidence for use of siege towers in Ancient Egypt and Anatolia dates to the Bronze Age. They were used extensively in warfare of the ancient Near East after the Late Bronze Age collapse, and in Egypt by Kingdom of Kush, Kushites from Sudan who founded the Twenty-fifth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pergamon
Pergamon or Pergamum ( or ; ), also referred to by its modern Greek form Pergamos (), was a rich and powerful ancient Greece, ancient Greek city in Aeolis. It is located from the modern coastline of the Aegean Sea on a promontory on the north side of the river Caicus (modern-day Bakırçay) and northwest of the modern city of Bergama, Turkey. During the Hellenistic period, it became the capital of the Kingdom of Pergamon in 281–133 BC under the Attalid dynasty, who transformed it into one of the major cultural centres of the Greek world. Many remains of its monuments can still be seen and especially the masterpiece of the Pergamon Altar. Pergamon was the northernmost of the seven churches of Asia cited in the New Testament Book of Revelation. The city is centered on a mesa of andesite, which formed its acropolis. This mesa falls away sharply on the north, west, and east sides, but three natural terraces on the south side provide a route up to the top. To the west of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roman Republic
The Roman Republic ( ) was the era of Ancient Rome, classical Roman civilisation beginning with Overthrow of the Roman monarchy, the overthrow of the Roman Kingdom (traditionally dated to 509 BC) and ending in 27 BC with the establishment of the Roman Empire following the War of Actium. During this period, Rome's control expanded from the city's immediate surroundings to hegemony over the entire Mediterranean Sea, Mediterranean world. Roman society at the time was primarily a cultural mix of Latins (Italic tribe), Latin and Etruscan civilization, Etruscan societies, as well as of Sabine, Oscan, and Greek cultural elements, which is especially visible in the Ancient Roman religion and List of Roman deities, its pantheon. Its political organisation developed at around the same time as direct democracy in Ancient Greece, with collective and annual magistracies, overseen by Roman Senate, a senate. There were annual elections, but the republican system was an elective olig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
047 Conrad Cichorius, Die Reliefs Der Traianssäule, Tafel XLVII (Ausschnitt 02)
47, 47 or forty-seven may refer to: *47 (number) *47 BC * AD 47 *1947 *2047 *'47 (brand), an American clothing brand * ''47'' (magazine), an American publication * 47 (song), a song by Sidhu Moose Wala *47, a song by New Found Glory from the album '' Not Without a Fight'' *"Forty Seven", a song by Karma to Burn from the album '' V'', 2011 * +47, the international calling code for Norway * 4seven, a television channel *Agenda 47, code for the Trumpist plans in the elections for the 47th president *Donald Trump, the 47th president of the United States *Agent 47, protagonist of the ''Hitman'' video game series *''47'', a young adult novel by Walter Mosley *47 Aglaja, a main-belt asteroid See also * List of highways numbered 47 * Channel 47 (other) * M47 (other) M47 or M-47 may refer to: * M47 bomb, an American chemical/incendiary weapon * 47th known Mersenne prime * M47 Dragon, an American anti-tank missile system * M-47 (Michigan highway), a state highway in M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bal BBC1
Bal or BAL may refer to: People * Bal (surname), including a list of people with the name * Bal (given name), including a list of people with the name Places * Bal, Iran (other), several places * Bal, Zira, Punjab, India * Bäl, Gotland, Sweden Science Medicine * Bio-artificial liver, a bioartificial liver device * Blood alcohol content * Bronchoalveolar lavage, a diagnostic method of the lower respiratory system * British anti-Lewisite, or Dimercaprol, a medication to treat acute poisoning * Cholate—CoA ligase, or bile acid CoA ligase (BAL), an enzyme Computing * IBM Basic Assembly Language and successors * Business application language Transportation * Balham station, London, England, station code BAL * Ballarat railway station, Australia * Baltimore Penn Station, Baltimore, Maryland, US, AMTRAK code BAL * Batman Airport, Batman, Turkey, IATA airport code BAL * BAL, abbreviation of the now-defunct Russian airline, BAL Bashkirian Airlines * BAL, the p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hecht 090710 Ballista
Hecht may refer to: * Hecht (surname) * Hecht, a pop rock band from Lucerne, Switzerland. * Hecht's, a chain of department stores, also known as Hecht Brothers, Hecht Bros. and the Hecht Company * Hecht Museum at Haifa University in Israel * ''Hecht'' (submarine), a German World War II two-person submarine * Wolfpack Hecht ("Pike"), a group of German World War II U-boats * Hecht is a gymnastics dismount skill performed on the horizontal bar or uneven bars The uneven bars or asymmetric bars is an artistic gymnastics apparatus. It is made of a steel frame. The bars are made of fiberglass with wood coating, or less commonly wood. The English abbreviation for the event in gymnastics scoring is UB or ... * Hecht vault, a type of vault in gymnastics See also * Justice Hecht (other) {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
