Four-centred arch
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A four-centred arch or four-centered arch is a low, wide type of arch with a pointed apex. Its structure is achieved by drafting two arcs which rise steeply from each springing point on a small radius
Tudor arch at Layer Marney Tower, 1520s
Persian arches on the Si-o-se-pol bridge, Isfahan, c. 1600
The 17th century Buland Darwaza at Fatehpur Sikri has a four-centred archway with vaulted iwan.
Restored 9th century arches of the Qasr al-'Ashiq, Samarra.
Pointed arch
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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. Also known as a two-centred arch, its form
Four-centred arch
…1485–1603), though its use predates 1485 by several decades, and from about 1550 it was out of fashion for grand buildings. It is a blunted version of the pointed arch of Gothic architecture, of which Tudor architecture is the last phase in England. A Tudor arch differs slightly from a true four-centred arch in having…
Pointed arches form the rib vaults of Worcester Cathedral (1084–1504)
7th-century Byzantine pointed arches from Chytroi-Constantia Aqueduct, Cyprus
Abbasid architecture arches in Dār al-Khilāfa palace in Samarra, Iraq (9th century)
The Abbasid Nilometer of Cairo (861 AD)