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Ballista (PSF) Vector
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] |
Siege Weapon
A siege engine is a device that is designed to break or circumvent heavy castle doors, thick city walls and other fortifications in siege warfare. Some are immobile, constructed in place to attack enemy fortifications from a distance, while others have wheels to enable advancing up to the enemy fortification. There are many distinct types, such as siege towers that allow foot soldiers to scale walls and attack the defenders, battering rams that damage walls or gates, and large ranged weapons (such as ballistas, catapults/ trebuchets and other similar constructions) that attack from a distance by launching heavy projectiles. Some complex siege engines were combinations of these types. Siege engines are fairly large constructions – from the size of a small house to a large building. From antiquity up to the development of gunpowder, they were made largely of wood, using rope or leather to help bind them, possibly with a few pieces of metal at key stress points. They could la ... [...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] |
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] |
Second Punic War
The Second Punic War (218 to 201 BC) was the second of Punic Wars, three wars fought between Ancient Carthage, Carthage and Roman Republic, Rome, the two main powers of the western Mediterranean Basin, Mediterranean in the 3rd century BC. For 17 years the two states struggled for supremacy, primarily in Roman Italy, Italy and Iberia, but also on the islands of Sicily and Sardinia and, towards the end of the war, in North Africa. After immense materiel and human losses on both sides, the Carthaginians were once again defeated. Macedonia (ancient kingdom), Macedonia, Kingdom of Syracuse, Syracuse and several Numidians, Numidian kingdoms were drawn into the fighting, and Celtiberians, Iberian and Gauls, Gallic forces fought on both sides. There were three main Theater (military), military theatres during the war: Italy, where Hannibal defeated the Roman legions repeatedly, with occasional subsidiary campaigns in Sicily, Sardinia and Greece; Iberia, where Hasdrubal (Barcid), Hasdru ... [...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] |
Polybius
Polybius (; , ; ) was a Greek historian of the middle Hellenistic period. He is noted for his work , a universal history documenting the rise of Rome in the Mediterranean in the third and second centuries BC. It covered the period of 264–146 BC, recording in detail events in Italy, Iberia, Greece, Macedonia, Syria, Egypt and Africa, and documented the Punic Wars and Macedonian Wars among many others. Polybius' ''Histories'' is important not only for being the only Hellenistic historical work to survive in any substantial form, but also for its analysis of constitutional change and the mixed constitution. Polybius' discussion of the separation of powers in government, of checks and balances to limit power, and his introduction of "the people", all influenced Montesquieu's '' The Spirit of the Laws'', John Locke's '' Two Treatises of Government'', and the framers of the United States Constitution. The leading expert on Polybius for nearly a century was F. W. Walbank (1909 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
