centring: temporary wooden scaffolding on which an arch or vault rests until the mortar has set.
chancel: east end of a church containing the altar; in a large church, east of the choir; in a smaller one, east of the nave or crossing.
The process of building a vault requires first a temporary carpentry structure, called centring, which supports the masonry until the shell has been completed and the mortar has set.
Choisy (L'Art de bdtir chez les Romains), based on a minute examination of those portions of the vaults which still remain in situ, have shown that, on a comparatively slight centring, consisting of trusses placed about o ft.
Many early Abbasid structures such as the palace of Ukhaidhir bear a striking resemblance to Sassanian architecture, as they used the same techniques (vaults made without centring) and materials (mud brick, ...
CentringWooden support for the building of an arch or vault, removed after completion.Chambered tombNeolithic burial mound with a stone-built chamber and entrance passage covered by an earthen barrow or stone cairn.Chamfer ...
 See also: Vault, Stucco, Brick, Church, Arches
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