The four-centred arch, now known as the Tudor arch, was a defining feature; some of the most remarkable oriel windows belong to this period; the mouldings are more spread out and the foliage becomes more naturalistic.
to have owed its origin to the employment of centrings of one curve for all the ribs, instead of having separate centrings for the transverse, diagonal wall and intermediate ribs; it was facilitated also by the introduction of the four-centred arch, ...
The earliest occurrence or the four-centred arch is at Samarra at the Qubbat al-Sulaiybiyya. Another arch form which makes its first appearance at Samarra is the cusped arch which is used in the external decoration of the Qasr al-Ashiq.
FormworkTemporary framing of timber or metal used for casting concrete; also called shuttering.FosseA defensive ditch.Four-centred arch ...
 See also: Architecture, Arch, Tower, Timber, House
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