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Ogive
An ogive ( ) is the roundly tapered end of a two-dimensional or three-dimensional object. Ogive curves and surfaces are used in engineering, architecture and woodworking. Etymology The earliest use of the word ''ogive'' is found in the 13th century sketchbook of Villard de Honnecourt, from Picardy in northern France. The ''Oxford English Dictionary'' considers the French term's origin obscure; it might come from the Late Latin , the feminine perfect passive participle of , meaning the one who has met or encountered the other. However, Merriam-Webster's dictionary says it is from the "Middle English stone comprising an arch, from Middle French diagonal arch". Types and use in applied physical science and engineering In ballistics or aerodynamics, an ogive is a pointed, curved surface mainly used to form the approximately streamlined nose of a bullet or other projectile, reducing air resistance or the drag of air. In fact the French word ''ogive'' can be translated as "nose ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nose Cone Design
Given the problem of the aerodynamic design of the nose cone section of any vehicle or body meant to travel through a compressible fluid medium (such as a rocket or aircraft, missile, shell or bullet), an important problem is the determination of the nose cone geometrical shape for optimum performance. For many applications, such a task requires the definition of a solid of revolution shape that experiences minimal resistance to rapid motion through such a fluid medium. Nose cone shapes and equations General dimensions In all of the following nose cone shape equations, is the overall length of the nose cone and is the radius of the base of the nose cone. is the radius at any point , as varies from , at the tip of the nose cone, to . The equations define the two-dimensional profile of the nose shape. The full body of revolution of the nose cone is formed by rotating the profile around the centerline . While the equations describe the 'perfect' shape, practical nose cones ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Drag (physics)
In fluid dynamics, drag (sometimes called air resistance, a type of friction, or fluid resistance, another type of friction or fluid friction) is a force acting opposite to the relative motion of any object moving with respect to a surrounding fluid. This can exist between two fluid layers (or surfaces) or between a fluid and a solid surface. Unlike other resistive forces, such as dry friction, which are nearly independent of velocity, the drag force depends on velocity. Drag force is proportional to the velocity for low-speed flow and the squared velocity for high speed flow, where the distinction between low and high speed is measured by the Reynolds number. Even though the ultimate cause of drag is viscous friction, turbulent drag is independent of viscosity. Drag forces always tend to decrease fluid velocity relative to the solid object in the fluid's path. Examples Examples of drag include the component of the net aerodynamic or hydrodynamic force acting opposite to the d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spitzer (bullet)
The spitzer bullet (or spire point) is a pointed projectile that is primarily used in small-arms. The pointed nose shape, which was developed for military purposes in the late 19th and early 20th century, was a major design improvement compared to earlier rounder or flatter-tipped bullets because pointed nose shapes were less susceptible to external ballistic factors like drag. By adding a point, projectiles made for fully-powered and intermediate rifle cartridges, obtain a lower drag coefficient which makes them decelerate less rapidly. Lowering the drag coefficient leads to improved external ballistic behaviour. The development of spitzer bullets and long-range volley sights for service rifles changed military doctrines. Area targets at ranges up to could be subject to rifle fire. With improvements in machine guns at the turn of the 20th Century, the addition of clinometers meant that fixed machine gun squads could deliver plunging fire or indirect fire at more than . ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kosambi
Kosambi (Pali) or Kaushambi ( Sanskrit) was an important city in ancient India. It was the capital of the Vatsa kingdom, one of the sixteen mahajanapadas. It was located on the Yamuna River about southwest of its confluence with the Ganges at Prayaga (modern Prayagraj). History During 2nd millennium BCE Ochre Coloured Pottery culture spread in the region. Kosambi was one of the greatest cities in India from the late Vedic period until the end of Maurya Empire with occupation continuing until the Gupta Empire. As a small town, it was established in the late Vedic period, by the rulers of Kuru Kingdom as their new capital. The initial Kuru capital Hastinapur was destroyed by floods, and the Kuru King transferred his entire capital with the subjects to a new capital that he built near the Ganga-Jamuma confluence, which was 56 km away from the southernmost part of the Kuru Kingdom now as Prayagraj previously called Allahabad.During the period prior the Maurya Empire, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archaeological Survey Of India
The Archaeological Survey of India (ASI) is an Indian government agency that is responsible for archaeological research and the conservation and preservation of cultural historical monuments in the country. It was founded in 1861 by Alexander Cunningham who also became its first Director-General. History ASI was founded in 1861 by Alexander Cunningham who also became its first Director-General. The first systematic research into the subcontinent's history was conducted by the Asiatic Society, which was founded by the British Indologist William Jones on 15 January 1784. Based in Calcutta, the society promoted the study of ancient Sanskrit and Persian texts and published an annual journal titled ''Asiatic Researches''. Notable among its early members was Charles Wilkins who published the first English translation of the '' Bhagavad Gita'' in 1785 with the patronage of the then Governor-General of Bengal, Warren Hastings. However, the most important of the society's ac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corbel
In architecture, a corbel is a structural piece of stone, wood or metal jutting from a wall to carry a superincumbent weight, a type of bracket. A corbel is a solid piece of material in the wall, whereas a console is a piece applied to the structure. A piece of timber projecting in the same way was called a "tassel" or a "bragger" in England. The technique of corbelling, where rows of corbels deeply keyed inside a wall support a projecting wall or parapet, has been used since Neolithic (New Stone Age) times. It is common in medieval architecture and in the Scottish baronial style as well as in the vocabulary of classical architecture, such as the modillions of a Corinthian cornice. The corbel arch and corbel vault use the technique systematically to make openings in walls and to form ceilings. These are found in the early architecture of most cultures, from Eurasia to Pre-Columbian architecture. A console is more specifically an "S"-shaped scroll bracket in the classica ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Satavahana Dynasty
The Satavahanas (''Sādavāhana'' or ''Sātavāhana'', IAST: ), also referred to as the Andhras in the Puranas, were an ancient Indian dynasty based in the Deccan region. Most modern scholars believe that the Satavahana rule began in the late second century BCE and lasted until the early third century CE, although some assign the beginning of their rule to as early as the 3rd century BCE based on the Puranas, but uncorroborated by archaeological evidence. The Satavahana kingdom mainly comprised the present-day Andhra Pradesh, Telangana, and Maharashtra. At different times, their rule extended to parts of modern Gujarat, Madhya Pradesh, and Karnataka. The dynasty had different capital cities at different times, including Pratishthana (Paithan) and Amaravati ( Dharanikota). The origin of the dynasty is uncertain, but according to the Puranas, their first king overthrew the Kanva dynasty. In the post-Maurya era, the Satavahanas established peace in the Deccan region and r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trivikrama Temple
The Trivikrama Temple, also named Ter Temple, is a temple of Vamana (an incarnation of Vishnu) in Ter, Maharashtra. Henry Cousens, followed by most later writers, believed that it was originally a Buddhist temple, however in 1957 M. S. Mate disputed this view. The temple is original in that it was initially based on a free-standing apsidal structure, now located at the back of the building, which is characteristic of early Buddhist apsidal '' caityagriha'' designs. The apsidal structure seems to be contemporary to the great apsidal temple found in Sirkap, Taxila, which is dated to 30 BCE-50 CE. It would have been built under the Satavahanas, in the 2nd or 3rd century CE. The external flat-roofed mandapa structure is probably only an addition from the 6th century CE, when the temple was converted into a Hindu temple. A stone image of Trivikrama probably dates to the early Chalukyas. The front of the apsidal temple is decorated with a chaitya-arch, similar to those found in Buddhi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sitamarhi Cave
Sitamarhi Cave is an Indian artificial cave, and an important example of Indian rock-cut architecture. The cave is located 20 km south-west from Rajgir, 10 km south-west of Hisua, and dated to the Maurya empire.Gupta, The roots of Indian Art, p.194- It was hewn in a huge hemispherical rock of granite. The cave has the structure and "Mauryan polish" qualities of the Barabar caves, but without any inscription. It is smaller than the Barabar caves, measuring only 4.91x3.43m, with a ceiling height of 2.01m. The entrance is also trapezoidal, as for the Barabar caves. According to a later Hindu legend, the cave was built by the legendary builder Vishvakarman. This is also the cave is which Sita took refuge from Mara, hence the name of the cave. The cave is sometimes considered as part of the "Rajgir group", together with Son Bhandar Caves The Son Bhandar Caves (also known as the Swarn Bhandar Caves) are two man-made caves carved into the base of the Vaibhar Hills in Rajgir in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pointed Arch (architecture)
A pointed arch, ogival arch, or Gothic arch is an arch with a pointed crown, whose two curving sides meet at a relatively sharp angle at the top of the arch. This architectural element was particularly important in Gothic architecture. The earliest use of a pointed arch dates back to bronze-age Nippur. As a structural feature, it was first used in Islamic architecture, but in the 12th century it began to be used in France and England as an important structural element, in combination with other elements, such as the rib vault and later the flying buttress. These allowed the construction of cathedrals, palaces and other buildings with dramatically greater height and larger windows which filled them with light. Early arches Crude arches pointed in shape have been discovered from the Bronze Age site of Nippur dated earlier than 2700 BC. The palace of Nineveh also has pointed arched drains but they have no true keystone. File:Trivikram Temple Ter 1.jpg, Temple of Trivikrama in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Worcester Cathedral 010
Worcester may refer to: Places United Kingdom * Worcester, England, a city and the county town of Worcestershire in England ** Worcester (UK Parliament constituency), an area represented by a Member of Parliament * Worcester Park, London, England * Worcestershire, a county in England United States * Worcester, Massachusetts, the largest city with the name in the United States ** Worcester County, Massachusetts * Worcester, Missouri * Worcester, New York, a town ** Worcester (CDP), New York, within the town * Worcester Township, Montgomery County, Pennsylvania * Worcester, Vermont ** Worcester (CDP), Vermont, within the town * Worcester, Wisconsin, a town * Worcester (community), Wisconsin, an unincorporated community * Worcester County, Maryland * Barry, Illinois, formerly known as Worcester * Marquette, Michigan, formerly known as New Worcester Other places * Worcester, Limpopo, South Africa * Worcester, Western Cape, South Africa * Worcester Summit, Antarctica Transport ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Handgun
A handgun is a short-barrelled gun, typically a firearm, that is designed to be usable with only one hand. It is distinguished from a long gun (i.e. rifle, shotgun or machine gun, etc.), which needs to be held by both hands and also braced against the shoulder to be used properly. The two most common types of handguns in modern times are revolvers and semi-automatic pistols, although other types such as derringers and machine pistols also see infrequent usage. Before commercial mass production, handguns were often considered a badge of office, comparable to a ceremonial sword. As they had limited utility and were more expensive than the long guns of the era, the few who could only afford to purchase them carried these handguns. However, in 1836, Samuel Colt patented the Colt Paterson, the first practical mass-produced revolver, which was capable of firing five shots in rapid succession and very quickly became a popular defensive weapon, giving rise to the saying, "God crea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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