Barrel Roses

Barrel vault

I want to introduct something about Air Compressor and Jump Start. We can supply you the combination for air compressor, spotlight, inflator and jump start.mor

Nave of Lisbon Cathedral with a barrel vaulted soffit. Note the absence of clerestory windows, all of the light being provided by the Rose window at one end of the vault.

The Cloisters, New York City
A barrel vault, also known as a tunnel vault or a wagon vault, is an architectural element formed by the extrusion of a single curve (or pair of curves, in the case of a pointed barrel vault) along a given distance. The curves are typically circular in shape, lending a semi-cylindrical appearance to the total design. The barrel vault is the simplest form of a vault: effectively a series of arches placed side by side, i.e., one after another.
As with all arch-based constructions, there is an outward thrust generated against the walls underneath a barrel vault. There are several mechanisms for absorbing this thrust. One is, of course, to make the walls exceedingly thick and strong – this is a primitive and sometimes unacceptable method. A more elegant method is to build two or more vaults parallel to each other; the forces of their outward thrusts will thus negate each other. This method was most often used in construction of churches, where several vaulted naves ran parallel down the length of the building. However, the outer walls of the outermost vault would still have to be quite strong or reinforced by buttressing. The third and most elegant mechanism to resist the lateral thrust was to create an intersection of two barrel vaults at right angles, thus forming a groin vault.
Barrel vaults are known from Ancient Egypt, and were used extensively in Roman architecture. They were also used to replace the Cloaca Maxima with a system of underground sewers. Early barrel vault designs occur in northern Europe, Turkey, Morocco and other regions. In medieval Europe the barrel vault was an important element of stone construction in monasteries, castles, tower houses and other structures. This form of design is observed in cellars, crypts, long hallways, cloisters and even great halls.
Theory and early history
Barrel vaulting was known and employed by early civilizations, including Ancient Egypt and Mesopotamia, but apparently it was not a very popular or very common method of construction. The technique probably evolved out of necessity to roof buildings with masonry elements such as bricks or stone blocks in areas where timber and wood were scarce. The earliest known example of a vault is a Tunnel vault found under the Sumerian ziggurat at Nippur in Babylonia, ascribed to about 4000 BC, which was built of burnt bricks amalgamated with clay mortar. The earliest tunnel vaults in Egypt are found at Requagnah and Denderah, circa 3500 BC; these were built in sun-dried brick in three rings over passages descending to tombs: in these cases, as the span of the vault was only two meters. In these early instances, the barrel vault was chiefly used for underground structures such as drains and sewers, though several buildings of the great Late Egyptian mortuary palace-temple of Ramesseum were also vaulted in this way. Recent archaeological evidence discovered at the Morgantina site (in the province of Enna) shows that the aboveground barrel vault was known and used in Hellenistic Sicily in third century BC, indicating that the technique was also known to Ancient Greeks.
Ancient Romans most probably inherited their knowledge of barrel vaulting from Etruscans. Romans were the first to use this building method extensively on large-scale projects, and were probably the first to use scaffolding to aid them in construction of vaults spanning over widths greater than anything seen before. However, Roman builders gradually began to prefer the use of groin vault; though more complex to erect, this type of vault did not require heavy, thick walls for support (see bellow), and thus allowed for more spacious buildings with greater openings and much more light inside, such as thermae.
After the fall of the Roman empire, few buildings large enough to require much in the way of vaulting were built for several centuries. In the early Romanesque period, a return to stone barrel vaults was seen for the first great cathedrals; their interiors were fairly dark, due to thick, heavy walls needed for support of vault. One of the largest and most famous churches enclosed from above by a vast barrel vault was the church of Cluny Abbey, built between eleventh and twelfth century.
In thirteenth and fourteenth century, with the advance of the new Gothic style, barrel vaulting became almost extinct in constructions of great Gothic cathedrals; groin vaults reinforced by stone ribs were mostly used in the beginning, and later on various types of…(and so on) To get More information , you can visit some products about hid headlamp, Rechargeable LED Torch, . The Air Compressor and Jump Start products should be show more here!

About the Author

himfr can provide you most popular hot products from china!

Four Roses Bourbon Private Barrel Selection

Royal Albert Country Rose Chintz Cookie Jar $28.79 Cookie Jar – Multi-Color Rose Floral Decor On White Background – Made In Not Specified…

Rolling Pin, Wide Barrel, 17-1/2” Long, North American Hardwood $18.00 Rolling Pin, Wide Barrel, 17-1/2” Long, North American Hardwood. Nylon Bearings, Steel Rod With Diameter Of 1/4”. Barrel Diameter Is 3-1/4”…

Royal Albert Old Country Roses Basketweave Cookie Jar $120.00 Royal Albert’s Old Country Roses is one of the most popular bone china patterns ever produced. A design classic, with a lavish 22-carat gold border is adorned by English roses; Old Country Roses has an enduring appeal for those with a passion for florals and a taste for nostalgia and vintage-chic. Over 150 million pieces of Old Country roses have been sold worldwide since its introduction in 196…

Mozart’s Magnificent Voyage $8.87 All products are BRAND NEW and factory sealed. Fast shipping and 100% Satisfaction Guaranteed….

Carousel Memories $5.91 All products are BRAND NEW and factory sealed. Fast shipping and 100% Satisfaction Guaranteed….

Catch the Brass Ring $16.98 31 songs of Old-fashioned merry-go-round music….

VWPics Flowers – Barrel Cactus flowers.(Ferocactus acanthodes).Anza-Borrego Desert State Park, California – Light Switch Covers – single toggle switch $11.75 Barrel Cactus flowers.(Ferocactus acanthodes).Anza-Borrego Desert State Park, California Light Switch Cover is new and handcrafted utilizing unique process resulting in a stunning high gloss ceramic-like finish. SET OF MATCHING SCREWS IS INCLUDED giving it a perfect finishing touch. Made of durable metal material….

VWPics Flowers – Barrel Cactus flowers.(Ferocactus acanthodes).Anza-Borrego Desert State Park, California – Light Switch Covers – 2 plug outlet cover $13.95 Barrel Cactus flowers.(Ferocactus acanthodes).Anza-Borrego Desert State Park, California Light Switch Cover is new and handcrafted utilizing unique process resulting in a stunning high gloss ceramic-like finish. SET OF MATCHING SCREWS IS INCLUDED giving it a perfect finishing touch. Made of durable metal material….

VWPics Flowers – Barrel Cactus flowers.(Ferocactus acanthodes).Anza-Borrego Desert State Park, California – Light Switch Covers – double toggle switch $13.75 Barrel Cactus flowers.(Ferocactus acanthodes).Anza-Borrego Desert State Park, California Light Switch Cover is new and handcrafted utilizing unique process resulting in a stunning high gloss ceramic-like finish. SET OF MATCHING SCREWS IS INCLUDED giving it a perfect finishing touch. Made of durable metal material….

Charlie Rose with James Tierney; Brian Green; Guy Ritchie (February 16, 1999) $24.95 Attorney James Tierney discusses the tobacco settlement, U.S. policy toward Big Tobacco, the danger of letting lawsuits set precedents instead of elected officials, and the future of the cigarette business. Then, physicist Brian Green discusses his book, The Elegant Universe: Super Strings, Hidden Dimensions, and the Quest for the Ultimate Theory, physics, theoretical physics, string theory, and S…