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Gunloop
An embrasure (or crenel or crenelle; sometimes called gunhole in the domain of gunpowder-era architecture) is the opening in a battlement between two raised solid portions (merlons). Alternatively, an embrasure can be a space hollowed out throughout the thickness of a wall by the establishment of a bay. This term designates the internal part of this space, relative to the closing device, door or window. In fortification this refers to the outward splay of a window or of an arrowslit on the inside. In ancient military engineering, embrasures were constructed in towers and walls, in particular between the merlons and the battle. A loophole, arrow loop or arrowslit passes through a solid wall, and thus forms an embrasure of shooting, allowing archer or gunner weapons to be fired out from the fortification while the firer remains under cover. This type of opening was flared inward - that is: the opening was very narrow on the outside, but wide on the inside, so that a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
200707 Fort La Latte 38
7 (seven) is the natural number following 6 and preceding 8. It is the only prime number preceding a cube. As an early prime number in the series of positive integers, the number seven has greatly symbolic associations in religion, mythology, superstition and philosophy. The seven Classical planets resulted in seven being the number of days in a week. It is often considered lucky in Western culture and is often seen as highly symbolic. Unlike Western culture, in Vietnamese culture, the number seven is sometimes considered unlucky. It is the first natural number whose pronunciation contains more than one syllable. Evolution of the Arabic digit In the beginning, Indians wrote 7 more or less in one stroke as a curve that looks like an uppercase vertically inverted. The western Ghubar Arabs' main contribution was to make the longer line diagonal rather than straight, though they showed some tendencies to making the digit more rectilinear. The eastern Arabs developed the digit f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aigues-Mortes
Aigues-Mortes (; oc, Aigas Mòrtas) is a commune in the Gard department in the Occitania region of southern France. The medieval city walls surrounding the city are well preserved. Situated on the junction of the Canal du Rhône à Sète and the Chenal Maritime to Le Grau-du-Roi, the town is a transit center for canal craft and Dutch barges. Toponymy The name "Aigues-Mortes" was attested in 1248 in the Latinized form ', which means "dead water", or "stagnant water". The name comes from the marshes and ponds that surround the village (which has never had potable water). The inhabitants of the commune are known as ''Aigues-Mortais'' or ''Aigues-Mortaises''. The Occitan ' is equivalent to toponymic types in the Morteau Oil dialect cf. Morteau (Doubs): ''mortua Aqua'' (1105, VTF521) and Morteaue (Haute-Marne): ''mortua Aqua'' (1163, VTF521). in French means "pond of the King". In Occitan, ' means "pond with extension". History Antiquity The Roman general Gaius Mar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pillbox (military)
A pillbox is a type of blockhouse, or concrete dug-in guard-post, normally equipped with loopholes through which defenders can fire weapons. It is in effect a trench firing step, hardened to protect against small-arms fire and grenades, and raised to improve the field of fire. The modern concrete pillbox originated on the Western Front of World War I, in the German Army in 1916. Etymology The origin of the term is disputed. It has been widely assumed to be a jocular reference to the perceived similarity of the fortifications to the cylindrical and hexagonal boxes in which medical pills were once sold; also, the first German concrete pillboxes discovered by the Allies in Belgium were so small and light that they were easily tilted or turned upside down by the nearby explosion of even medium (240mm) shells. However, it seems more likely that it originally alluded to pillar boxes, with a comparison being drawn between the loophole on the pillbox and the letter-slot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Christian Symbolism
Christian symbolism is the use of symbols, including archetypes, acts, artwork or events, by Christianity. It invests objects or actions with an inner meaning expressing Christian ideas. The symbolism of the early Church was characterized by being understood by initiates only, while after the legalization of Christianity in the Roman Empire during the 4th century more recognizable symbols entered in use. Christianity has borrowed from the common stock of significant symbols known to most periods and to all regions of the world. Only a minority of Christian denominations have practiced Aniconism, or the avoidance or prohibition of types of images. These include early Jewish Christians sects, as well as some modern denominations such as Baptists that prefer to some extent not to use figures in their symbols due to the Decalogue's prohibition of idolatry. Early Christian symbols Cross and crucifix ✝︎ The shape of the cross, as represented by the letter T, came to be u ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arbalest
The arbalest (also arblast) was a late variation of the crossbow coming into use in Europe during the 12th century. A large weapon, the arbalest had a steel prod (the "bow" portion of the weapon). Since the arbalest was much larger than earlier crossbows, and because of the greater tensile strength of steel, it had a greater force. However, the greater draw weight was offset by the smaller which limited its potential in fully transferring the energy into the crossbow bolt. The strongest windlass-pulled arbalests could have up to of force and be accurate up to . A skilled arbalestier (arbalester) could loose two bolts per minute. Nomenclature The term "arbalest" is sometimes used interchangeably with "crossbow". ''Arbalest'' is a Medieval French word originating from the Roman name ' (from ' 'bow' + ' 'missile-throwing engine'), (arbalist, arblast) which was then used for crossbows, although originally used for types of artillery. Modern French French ( or ) is a R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elevation (ballistics)
In ballistics, the elevation is the angle between the horizontal plane and the axial direction of the barrel of a gun, mortar or heavy artillery. Originally, elevation was a ''linear'' measure of how high the gunners had to physically lift the muzzle of a gun up from the gun carriage to compensate for projectile drop and hit targets at a certain distance. Until WWI Though early 20th-century firearms were relatively easy to fire, artillery was not. Before and during World War I, the only way to effectively fire artillery was plotting points on a plane. Most artillery units seldom employed their guns in small numbers. Instead of using pin-point artillery firing they used old means of " fire for effect" using artillery en masse. This tactic was employed successfully by past armies. By World War I, reasonably accurate artillery fire was possible even at long range requiring significant elevation. However, artillery tactics used in previous wars were carried on, and still had ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Musket
A musket is a muzzle-loaded long gun that appeared as a smoothbore weapon in the early 16th century, at first as a heavier variant of the arquebus, capable of penetrating plate armour. By the mid-16th century, this type of musket gradually disappeared as the use of heavy armour declined, but ''musket'' continued as the generic term for smoothbore long guns until the mid-19th century. In turn, this style of musket was retired in the 19th century when rifled muskets (simply called rifles in modern terminology) using the Minié ball (invented by Claude-Étienne Minié in 1849) became common. The development of breech-loading firearms using self-contained cartridges (introduced by Casimir Lefaucheux in 1835) and the first reliable repeating rifles produced by Winchester Repeating Arms Company in 1860 also led to their demise. By the time that repeating rifles became common, they were known as simply "rifles", ending the era of the musket. Etymology According to the Online Ety ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cannon
A cannon is a large- caliber gun classified as a type of artillery, which usually launches a projectile using explosive chemical propellant. Gunpowder ("black powder") was the primary propellant before the invention of smokeless powder during the late 19th century. Cannons vary in gauge, effective range, mobility, rate of fire, angle of fire and firepower; different forms of cannon combine and balance these attributes in varying degrees, depending on their intended use on the battlefield. A cannon is a type of heavy artillery weapon. The word ''cannon'' is derived from several languages, in which the original definition can usually be translated as ''tube'', ''cane'', or ''reed''. In the modern era, the term ''cannon'' has fallen into decline, replaced by ''guns'' or ''artillery'', if not a more specific term such as howitzer or mortar, except for high-caliber automatic weapons firing bigger rounds than machine guns, called autocannons. The earliest known depict ... [...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'', XXIII:4. 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 fourth century army officer and historian Ammianus Marcellinus witnessed the use of ''scorpiones'' during several engagements in the Persian wars of Constantius II, and described the one-armed version as synonymous with the ''onager'', with the vertical upraised arm as the 'scorpion's sting'. The complexity of construction and in particular the torsion springs (which the Romans referred to as ''tormenta'') led to great sensitivity to any variation in temperature or moisture, which limited their use. W ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Histories (Polybius)
Polybius’ ''Histories'' ( grc-gre, Ἱστορίαι ''Historíai'') were originally written in 40 volumes, only the first five of which are extant in their entirety. The bulk of the work was passed down through collections of excerpts kept in libraries in the Byzantine Empire. Polybius, a historian from the Greek city of Megalopolis in Arcadia, was taken as a hostage to Rome after the Roman victory in the Third Macedonian War (171–168 BC), and there he began to write an account of the rise of Rome to a great power. Content Polybius' ''Histories'' begin in the year 264 BC and end in 146 BC (Polybius was born around 200 BC and died around 117 BC). He is primarily concerned with the 53 years in which Ancient Rome became a dominant world power. This period, from 220–167 BC, saw Rome subjugate Carthage and gain control over Hellenistic Greece. Books I through V cover the affairs of important states at the time ( Ptolemaic Egypt, Hellenistic Greece, Macedon) and deal ex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polybius
Polybius (; grc-gre, Πολύβιος, ; ) was a Greek historian of the Hellenistic period. He is noted for his work , which covered the period of 264–146 BC and the Punic Wars in detail. Polybius is important for his analysis of the mixed constitution or the separation of powers in government, his in-depth discussion of checks and balances to limit power, and his introduction of "the people", which 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 (1909–2008), who published studies related to him for 50 years, including a long commentary of his ''Histories'' and a biography. Early life Polybius was born around 200 BC in Megalopolis, Arcadia, when it was an active member of the Achaean League. The town was revived, along with other Achaean states, a century before he was born. Polybius' father, Lyc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archimedes
Archimedes of Syracuse (;; ) was a Greek mathematician, physicist, engineer, astronomer, and inventor from the ancient city of Syracuse in Sicily. Although few details of his life are known, he is regarded as one of the leading scientists in classical antiquity. Considered the greatest mathematician of ancient history, and one of the greatest of all time,* * * * * * * * * * Archimedes anticipated modern calculus and analysis by applying the concept of the infinitely small and the method of exhaustion to derive and rigorously prove a range of geometrical theorems. These include the area of a circle, the surface area and volume of a sphere, the area of an ellipse, the area under a parabola, the volume of a segment of a paraboloid of revolution, the volume of a segment of a hyperboloid of revolution, and the area of a spiral. Heath, Thomas L. 1897. ''Works of Archimedes''. Archimedes' other mathematical achievements include deriving an approximation of pi, defining ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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