The point from which the arch rises from its vertical supports is known as the spring, or springing line. The Roman arch is a significant element of the architecture of Rome. Reed Hepler received an M.L.I.S. A skewback is a masonry course with an inclined surface supporting the ends of an arch. Durham's cabinet pull features an appealing yet simple barrel shape that is sure to add traditional charm to your space. It is a type of an elliptical arch. Table of Contents. In the semi-circular arch, the thrust transmitted to the abutment is completely in a vertical direction. Flat Arch. Updates? For example, Muslim architects adapted the Roman arch into a pointed arch, especially in mosques. This type of purchase was normally utilized in the construction of residential windows and doors within the 20th century. The shape of the arch looks like asemi-circle. A flat arch is built by jointly supporting wedge shaped masonry units known as voussoirs. center, material, and others. It is also a one-centered arch. One of the earliest buildings to combine these elements into a coherent style was the abbey of Saint-Denis, Paris (c. 113544). The pointed arch features a rounded design with a tapered apex. Most architecture styles develop, and in a lot of cases become superseded over time, as changing fashions, technology . It is a strong arch that is able to bear heavy loads. An arch is a vertical curved structure that spans through an elevated space that may or may not support the weight above it. A good semi-elliptical shape arch contains five centres. Arches may be synonymous with vaults, but a vault may be distinguished as a continuous arch[2] forming a roof. Types of Arches Based on Building Materials Typically, there are only four building materials used in arches throughout history, becoming stronger and more sophisticated as time progressed. They used the arch to create dome roofs and vaulted ceilings for larger, stronger, and more spacious public buildings that could holds hundreds of people. Rounded horseshoe arch has a circular or rounded top formed by one arc with a single center. An arch whose intrados curve is described from two centres. The shape of the arch curve looks like a semi-circle. Triangular ArchA triangular arch is formed by two straight courses of masonry assembled at 45 degrees angle or similar, joining together at the top of the opening forming a triangular shape. Roman Basilica Concept, Architecture & History | What is a Basilica? In the semi-circular arch, thethrusttransmitted to theabutmentis completely in a vertical direction. 6. This is the basic type of arch used for buildings in which the Centre of the arch lies below the springing line. These stones are joined together using cement mortar. The Colosseum, largely built using arches, was designed by the Flavian emperors to convince the people that their emperor cared about them. Read More: Culvert | What Is a Culvert | Types of Culvert | Culvert Meaning | Parts of Culvert. It is also known as a semi-elliptical arch.Four-centered ArchA four-centered arch is an arch formed by four arcs with their four centers. The center of the stilted arches on a straight line. This slope had to be consistent for possibly hundreds of miles, which would have been impossible if the Romans could not elevate and support the aqueducts. [10], The many forms of arch are classified into three categories: circular, pointed, and parabolic. Both the arcs join together to form a pointed edge. Catenary ArchA catenary arch is an architectural arch that takes the form of an inverted catenary curve. - Mythology, Overview, Pseudo-Dionysius the Areopagite's Mystical Theology, Mark Antony of Rome: Biography, Facts & Death, Working Scholars Bringing Tuition-Free College to the Community, Ponte dei Quattro Capi, translated as ~Bridge of the Four Heads.~. A segmental arch is also known as a scheme arch.Two-centered ArchA two-centered arch is an arch that consists of two arcs with their centers on the springing line of the arch. This spectacle was a massive parade, and the triumphal arch, decorated with carvings of the emperor's victory, was one of the most important pieces. The unique bricks are generated, similar to the accurate shape and size of voussoirs, to give extremely fine workmanship. Romans in the first centuries BC discovered how to use arches in the construction of bridges, aqueducts and buildings. 12.Florentine Arches: Venetian Arch7. Stone Arches11. [48] Barrel vaults were also used in the Late Harappan Cemetery H culture dated 1900 BC-1300 BC which formed the roof of the metal working furnace, the discovery was made by Vats in 1940 during excavation at Harappa. Horseshoe Shape Arch. Recommended Types of Arches Ankit Shukla 52.7k views 29 slides Arches Jitesh Dhule 8.9k views 16 slides dome and vault kaiwan1996 44.3k views 48 slides Arches gayathrysatheesan1 537 views 33 slides ARCHES AND ITS TYPES Mohd Waqar 42.3k views 41 slides Space frames Bnv Aditya 118.5k views 29 slides Domes Rashi Jain 11.3k views Pointed or Gothic Arch. 3rd4th century. View more property details, sales history and Zestimate data on Zillow. An arch whose intrados is half an ellipse. This adjustment reflects that the arch is self-supporting, but temporary supports from the under, normally in the form of timber centers (occasionally called centering or arch formers), must be provided until the keystone has been established in place. Usually a pointed arch with a band wider at the peak than at the spring. Actually, the arch is one of the single most important architectural discoveries in human history, and we have the Romans to thank for it. This is known as a centre or centring. [4][5][6][7] It can span a large area by resolving forces into compressive stresses, and thereby eliminating tensile stresses. The intrados is similarly Flat and provided a slight increase of camber of about 10 mm to 15 mm. Stilted Arch9. Holt World History - Human Legacy: Online Textbook Help, Praxis Social Studies: Content Knowledge (5081) Prep, SAT Subject Test World History: Practice and Study Guide, CLEP Western Civilization I: Study Guide & Test Prep, Western Civilization I: Certificate Program, High School World History: Tutoring Solution, NY Regents Exam - Global History and Geography: Help and Review, DSST Western Europe Since 1945: Study Guide & Test Prep, Western Europe Since 1945: Certificate Program, Create an account to start this course today. Five-Centered Arches. The downward load of an arch must be transmitted to its foundations. Two Centered Arches15. Being the shape of the curve that a loose span of chain or rope traces, the catenary is the structurally ideal shape for a freestanding arch of constant thickness. Cement mortar is utilized in the construction of brick arches. [57] Structures such as this can be found in Arches National Park. The title of this arch is offered horseshoe arch because its shape is like a horseshoe that curves better than the semicircle. [10], Rounded, i. e. semicircular, arches were commonly used for ancient arches that were constructed of heavy masonry. Etruscan Architecture | Characteristics, Buildings & Overview, The Stavelot Triptych & the Role of the Reliquary, Roman Domestic Architecture | Style, House Layout & Development. A parabola is a curve that follows the path of an object thrown in the air and fallen on the ground. A triumphal arch is constructed to commemorate an achievement and triumph. Quicklist: Types of Arches Flat Arch Round Arch Segmental Arch Horseshoe Arch Three-Centered Arch Triangular Arch Three-Pointed Arch Parabolic Arch Inflexed Arch Rampant Arches Four-Centered Arch Keyhole Arch Ogee Arches Asian Arch Trefoil Arch Shouldered Flat (Jack) Arch Draped Arch Cinquefoil Arch Types of Pointed Arches Elliptical Arch The Fine Axed arches are composed by establishing bricks into the desired shape. These are common as decorative treatments of a wall surface in many architectural styles, especially Romanesque architecture. A trefoil arch is also known as a three-foiled cusped arch. An arch is a structure constructed in curved shape with wedge shaped units (either bricks or stones), which are jointed together with mortar, and provided at openings to support the weight of the wall above it along with other superimposed loads. These arches are used for a small span of up to. The external thrust put out by an arch at its floor must be restricted either by the weight of supporting walls or weight, by foundations, or by a contradicting tie between the two sides. In the segmental arch, the thrust is Transferred in an inclined direction to the abutment. The segmental arch is one of the toughest arches which has a decent capacity to withstand thrust. Entasis Architecture & Examples | What is Entasis? The objective of this study was to report the presence of SARS-CoV-2 antibodies, consistent with previous infection. ft. home is a 4 bed, 3.0 bath property. Its intrados is similar to a segmental arch in shape with a difference at the two ends that are curves. One of the most culturally important forms of Roman arch is the triumphal arch, an arch made for ceremonial purposes, such as celebrating military victories or the completion of a bridge. Segmental in shape and provided over the openings . This is called compressive stress, because the pressure of the weight is compressed by the shape of the arch. This is generally considered for architectural provisions. This type of arch uses space efficiently and decoratively when used for doorways. The catenary arch has a different shape from the parabolic arch. Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. It is usually made by the formation of two arcs with different radius on each side. The Romans, by contrast, used the semicircular arch in bridges, aqueducts, and large-scale architecture. They write new content and verify and edit content received from contributors. The semi-circular arch in the center will lie on the spring line. Medieval Europe made great use of the pointed arch, which constituted a basic element in Gothic architecture. There are many types of arches. Types of Arches in this category are as follows. Photo: LeCaire via Wikimedia Commons Public Domain Receive product news and updates in your inbox, Designing Classrooms Differently to Encourage Collaboration, Dutch Architecture: Exploring Amsterdam's Wonky Wonders, Deconstructivist Architect Rem Koolhaas & Organic Architect Santiago Calatrava, Life of a French Swiss Modern Architect Le Corbusier. Understand the Roman arch in architecture. Enrolling in a course lets you earn progress by passing quizzes and exams. Therefore not recommended for exposed brickworks. New Schaff-Herzog Encyclopedia of Religious Knowledge, Vol. Rampant ArchA rampant arch is an arch where supports of both ends of the arch is not same. The Romans were proud of the arch, and they had every reason to be. These types of arches contain four centers. Two courses of rings in header and stretcher form. An Equilateral Arch possesses a two-center. Guastavino Tile Arch SystemGuastavino Tile Arch System is a type of Catalan arch system that uses terracotta tiles and mortar to form self supporting arches or vaulting. Material selection, proper The first attempt at the A85 bridge at Dalmally, Scotland suffered this fate, in the 1940s. Brick masonry arches have been used for hundreds of years. from IUPUI, with emphases in Digital Curation and Archives Management. Arches are compressive structures, which is why there are no tensile stresses. It is roughly U-shaped arch. Shouldered Flat ArchA shouldered flat arch is an arch that consists of rounded shoulders on both sides of the flat horizontal arch opening. The choice of arch depends on the functional and aesthetic requirements of a building, as well as the building materials and techniques available at the time of construction. They were also routinely used in house construction, as in Ostia Antica (see picture). II. All three centers of intrados and extrados lie on the springing line of the arch. This type of arch is created above the Flat arch or on a wooden lintel. Stone arches have two main categories, which include the following: Ashlar Arches Ashlar arches use stones with the proper shape, either tapered or wedge-shaped. 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Constructed from cast-in-situ concrete, either plain or reinforced, depending upon the span and magnitude of loading. In buildings, the arch allowed for the construction of domes to cover wide areas and vaulted ceilings to add height. The pressure on each of the stones in Roman arches means they can support much more weight than a beam. While every effort has been made to follow citation style rules, there may be some discrepancies. lessons in math, English, science, history, and more. Old arches sometimes need reinforcement due to decay of the keystones, forming what is known as bald arch. It is widely used in Islamic architecture. The forms, along with the "strongly expressed ribs at the vault intersections, were dominant architectural features of Gothic cathedrals. An architecture style is a collection of external influences that shape the materiality, method of construction, and form of a building, helping it to be identified and characterized in both historical and design terms. For keystone and skewbacks special moulds are prepared. Barrel Vault | Construction & Architecture, Rome & Religious Architecture: Influences & Examples. [58], Depressed Tudor arch on Layer Marney Tower in Essex, England, Blind arches on the Church of San Tirso in Sahagn, Len, Spain, Washington Square Arch, a triumphal arch in Greenwich Village, Manhattan, New York City, Delicate Arch, a natural arch in Arches National Park near Moab, Utah, A rock balance sculpture in the form of an arch, Medial longitudinal arch of the human foot (Gray's Anatomy), Restored Canaanite city gate of Ashkelon, Ashkelon, Israel (2014), Reconstructed Ishtar Gate of Babylon in the Pergamon Museum, Berlin (2014), Taq Kasra (Archway of Ctesiphon), Salman Pak, Iraq (1864), Arch of Augustus, Rimini, Emilia-Romagna, Italy (2015), Arch of Constantine, Rome, commemorating a victory by Constantine I in 312 AD (2007), The Arc de Triomphe, Paris; a 19th-century triumphal arch modelled on the classical Roman design (1998), Soldiers' and Sailors' Arch in the Grand Army Plaza, Brooklyn, New York City (2007), Gateway Arch in St. Louis, Missouri; a monument based on a catenary arch (2011), The Theme Building at Los Angeles International Airport, California, Pont Flavien over the River Touloubre in Saint-Chamas, Bouches-du-Rhne, France (2008), Old stone bridge in Kerava, Finland (2011), Bridge of Seonamsa Temple, Suncheon, South Jeolla Province, South Korea (1979), Grosvenor Bridge over the River Dee in Chester, Cheshire, England, UK (2007), Union Arch Bridge carrying the Washington Aqueduct and MacArthur Boulevard (formerly named Conduit Road) in Cabin John, Montgomery County, Maryland (2008), Anji Bridge over the Xiaohe River, Hebei Province, China (2007), The dry stone bridge, so called Porta Rosa (4th century BC), in Elea, Province of Salerno, Campania, Italy (2005), Pont du Gard, a Roman aqueduct in Vers-Pont-du-Gard, Gard, France (2014), Bridge in esk Krumlov, Czech Republic (2004), Rialto Bridge over the Grand Canal in Venice, Italy (2011), Pont de Bercy over the River Seine, Paris, carrying the Paris Mtro on its upper deck and a boulevard extension on its lower deck (2006), Arlington Memorial Bridge over the Potomac River in Washington, D.C. (2007), Francis Scott Key Bridge over the Potomac River in Washington, D.C. (2006), Woodrow Wilson Memorial Bridge carrying Interstate 95 (I-95) and the Capital Beltway over the Potomac River between Alexandria, Virginia and Oxon Hill, Maryland (2007), Arrbida Bridge over the Douro River connecting Porto, and Vila Nova de Gaia, in the Norte Region, Portugal (2011), Rainbow Bridge over the Niagara River connecting Niagara Falls, New York and Niagara Falls, Ontario, Canada (2012), Tyne Bridge over the River Tyne, Newcastle upon Tyne, England, UK (2004), Hell Gate Bridge over the East River, New York City, Sydney Harbour Bridge, Sydney, New South Wales, Australia (2010), Ludendorff Bridge over the Rhine River, Remagen, Germany, showing damage before collapse during the Battle of Remagen in World War II (1945), Lianxiang bridge over the Xiang River, Xiangtan, Hunan Province, China (2007), Zhivopisny Bridge over the Moskva River, Moscow, Russia (2009), Margaret Hunt Hill Bridge over the Trinity River in Dallas, Texas (2012), Juscelino Kubitschek Bridge crossing Parano Lake, Braslia, Brazil (2007), Gateshead Millennium Bridge over the River Tyne, Newcastle upon Tyne, England, UK (2005), Arch supporting the Eiffel Tower, Paris (2015), The second Wembley Stadium in London, built in 2007 (2007), The first San Mams Stadium, in Bilbao, arch built in 1953, demolished 2013 (2013), St Pancras railway station, London (2011), Train shed in St Pancras railway station, London (2010), Train shed in Victoria Station, London (2006), Lucerne railway station, Switzerland (2010), Central railway station, Frankfurt, Germany (2008), Train shed in Central railway station, Frankfurt, Germany (2005), Arches in Main Concourse, Grand Central Terminal, Manhattan, New York City (2014), Interior arches in Washington Union Station, Washington, D.C. (2006), Arches in Great Hall, Chicago Union Station, Chicago, Illinois (2010), Haus der Kulturen der Welt, Berlin, Germany (2011), Stonework arches seen in a ruined stonework building Burg Lippspringe, Germany (2005), Arches in the Casa-Museo del Libertador Simn Bolvar in Havana, Cuba (2006)[59], Arches in dining hall at Kings College, University of Cambridge, Cambridge, England (2007), Arches inside Annenberg Hall, Memorial Hall, Harvard University, Cambridge, Massachusetts (2016), Healy Hall, Georgetown University, Washington, D.C. (2009), Arches in throne room of Neuschwanstein Castle, Bavaria, Germany (1886 photochrom print), Arches in the Court of the Lions, Alhambra, Granada, Andalusia, Spain (2012), External arches in the Court of the Myrtles, Alhambra, Granada, Andalusia, Spain (2009), Arches inside the North Gallery, Court of the Myrtles, Alhambra, Granada, Andalusia, Spain (2010), Arches in the nave of the church in monastery of Alcobaa, Portugal (2008), North facade of Chartres Cathedral, Chartres, France (2008), Arches in choir of Chartres Cathedral, Chartres, France (2013), Arches in nave of Westminster Abbey, City of Westminster, London (2006), Arches inside the Washington National Cathedral, Washington, D.C. (2005), Interior arches in St. Peter's Basilica, Vatican City (2009), Arches inside the Hagia Sophia in Istanbul, Turkey (1983), Arches inside the western upper gallery, Hagia Sophia, Istanbul, Turkey (2007), Interior arches in the Masjid al-Haram, Mecca, Saudi Arabia (2008), Roof of Masjid al-Haram, Mecca, Saudi Arabia (2008), Dome of the Rock, Old City of Jerusalem (2010), Arches inside the Dome of the Rock, Old City of Jerusalem (2014), Arches in the Shahi Mosque, Chitral, Khyber Pakhtunkhwa province, Pakistan (2016), Taj Mahal in Agra, Uttar Pradesh, India (2009), The Great Gate (Darwaza-i-rauza): Entrance to grounds of Taj Mahal, Agra, Uttar Pradesh, India (2004), Arches inside the Taj Majal, Agra, Uttar Pradesh, India, Arches in Main Reading Room, Thomas Jefferson Building, Library of Congress, Washington, D.C. (2009), Arches in Great Hall, Thomas Jefferson Building, Library of Congress, Washington, D.C. (2007), Art Deco arches on Chrysler Building, Manhattan, New York City (2005), New York Public Library Main Branch, Manhattan, New York City (2016), Arches inside the entrance of New York Public Library Main Branch, Manhattan, New York City (2012), Arches in Great Hall, Metropolitan Museum of Art, Manhattan, New York City (2012), Arches in Sculpture Gallery, West Building, National Gallery of Art, Washington, D.C. (2007), Arches inside the Legion of Honor, Lincoln Park, San Francisco, California (2010), Arches near the Jordan Staircase, Winter Palace, Hermitage Museum, St. Petersburg, Russia (2015), Arches in Pavilion Hall, Small Hermitage, Hermitage Museum, St. Petersburg, Russia (2015), Arches in Salle du Mange, Louvre Palace, Paris (2007), Arches in Galerie des Batailles, Palace of Versailles, Versailles, Yvelines, France (2013), Arches in Hall of Mirrors, Palace of Versailles, Versailles, Yvelines, France (2011), Arches in Westminster Hall, Palace of Westminster, City of Westminster, London (2011), Arches in St. Stevens Hall, Palace of Westminster, City of Westminster, London (2007), Horseshoe arch inside the Aljafera Palace, Zaragoza, Spain (2004), Multifoil arches inside the Aljafera Palace, Zaragoza, Spain (2004), Catenary arches inside the Casa Mil in Barcelona, Spain by Antoni Gaud (2010}, Rajasthani style arches inside the 16th-century City Palace, Udaipur, India (2013), Main faade of the Itamaraty Palace in Braslia, Brazil, decorated with many arches (2005), Arches inside the National Building Museum (formerly Pension Building), Washington, D.C. (2007), Front entrance of the Old Post Office Building in Washington, D.C. (2006), Arches inside the Old Post Office Building in Washington, D.C. (2009), Bankstown Reservoir, Bankstown, Sydney, New South Wales, Australia (2018), Crypt of the Popes in the Catacomb of Callixtus, Rome (2007), Chinese Eastern Han Dynasty (25220 AD) tomb chamber, Luoyang (2008), Entrance to Washington family tomb at Mount Vernon, Fairfax County, Virginia (2014), Natural Bridge in Rockbridge County, Virginia (2014), Jiangzhou Natural Bridge, Guangxi Zhuang Autonomous Region, China (2012), Landscape Arch, Arches National Park, Utah (2016), Double O Arch, Arches National Park, Utah (2007), Aloba Arch, Ennedi-Est Region, Chad (2015), Shipton's Arch, Xinjiang Uygur Autonomous Region, China (2011), Darwin's Arch, Galpagos Archipelago, Pacific Ocean (2006), Shah Abbas Arch Dam (Tagh E Shah Abbas), Tabas County, South Khorasan Province, Iran (2011), Hoover Dam in the Black Canyon of the Colorado River, Clark County, Nevada and Mohave County, Arizona (2017), El Atazar Dam on the Lozoya River near Madrid, Spain (2014), This article is about the architectural construct. A catenary curve is a U-shaped arc that follows the form of a freely hanging cord or chain, supported only from two fixed ends. Another advantage of the three-hinged arch is that the pinned bases are more easily developed than fixed ones, which allows shallow, bearing-type foundations in spans of medial length. Semi-Elliptical Arch8. Flat Arch4. [10], The most common kinds of true arch are the fixed arch, the two-hinged arch, and the three-hinged arch. It is also known as the half-through arch bridge. It is one of the types of a round arch and is also commonly known as a Roman arch.Segmental ArchA segmental arch is an arch with a curved arc having lower than 180 degrees. The Roman arch is the original incarnation of the arch, with a semi-circular top. Throughout the Roman empire, their engineers erected arch structures such as bridges, aqueducts, and gates. It is similar in appearance to a parabolic arch but it is not a parabolic arch. An arch can also carry a much greater load than a horizontal beam can support. Segmental Arch5. In the gauge brick type of arch, bricks are cut to the perfect shape and size of the necessary voussoir with the help of a wire saw. Corrections? Some rock balance sculptures are in the form of an arch. The ends of this arch should be taken adequately into the abutments. In masonry construction, arches have several great advantages over horizontal beams, or lintels. The Monolithic concrete arches were initially utilized for longer spans. A flat arch is generally constructed for lighter loads and cannot bear heavy loads. In round rampant arch, there is no pointed edge at the point where the two curves meet. Examples of use of the Roman arch include: Roman arches have several elements. The rib vault, flying buttress, and pointed (Gothic) arch were . In this type of arch, two arcs of circles meet at the apex; hence triangle is formed. Omissions? Monolithic concrete block arches are suitable for larger spans. Pointed Shape Arch2. Arches are similarly utilized as an Architectural element that will enable to increase in the aesthetical view of the structure. In the 12th13th century, feats of engineering permitted increasingly gigantic buildings. 5347 Wishing Arch Dr , Apollo Beach, FL 33572 is a single-family home listed for-sale at $1,150,000. The segmental arch was first built by the Romans who realized that an arch in a bridge did not have to be a semicircle,[31][32] such as in Alcontar Bridge or Ponte San Lorenzo. This Jeffrey Alexander pull is available in four standard pull lengths, 12" appliance handle and coordinating ringed mushroom knob. They even celebrated major victories by building triumphal arches and marching through them to make their success official. This architectural feature compresses weight down and outwards while creating open space. The Arabs popularized the pointed arch, and it was in their mosques that this form first acquired its religious connotations. For the construction of the gauged brick arches, skilled craftsmanship was required. The arch directs pressure downwards and outwards, creating a strong passage underneath . The precast concrete blocks are available in the accurate shape and sizes which are needed for the construction of the arches. Arches have been a common element inarchitecturesince the time of theEtruscanswho are placed with itsinnovation, although theRomansimproved it further and circulate its use. Venetian Arch7. Flat Arch4. Let us know if you have suggestions to improve this article (requires login). . Aqueducts required a consistent, gradual slope so that the water could flow through them naturally. 1. The Venetian arches come under the classification of four center arches which have a sum of four centers. I feel like its a lifeline. Relieving Arch10. Vault Architecture Development & Types | What is Vaulting in Architecture? The pointed-shaped arches are similarly identified as the Gothic arch. The ends of this arch should be carried sufficiently into the abutments. Our editors will review what youve submitted and determine whether to revise the article. Cinquefoil ArchPointed cinquefoil arch is an arch with the intrados outline created by five rings overlapping each other. It is roughly U-shaped arch. Roman arch The Roman arch or the classical arch is the most well-known arch design and is commonly used. For other uses of, "Key stone" redirects here. Blind Arch. It allowed the Romans to make bigger buildings, longer roads, and better aqueducts. [11] The fixed arch is most often used in reinforced concrete bridges and tunnels, which have short spans. The arch consists of a curved structural shape that transmits loads over the opening, transmitting them over the shape of the arch to jambs, abutments, or piers on either side. If a series of wedge-shaped blocksi.e., ones in which the upper edge is wider than the lower edgeare set flank to flank in the manner shown in the figure, the result is an arch. [11] It is most often used for spans of medial length, such as those of roofs of large buildings. An arch formed with multiple rings is called a multifoil arch. A semicircular arch having its extrados struck from a higher point than its intrados so that the length of the voussoirs is longer nearer the top of the arch.
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