Diagonal rib - The moldings which mark the diagonals in a rib vault.
diagonal ribs
The moldings which mark the diagonals in a rib vault. See also rib vault, Other types of ribs: lierne, ridge, tierceron, transverse
diamond shingles ...
A diagonal rib of a Gothic vault.
b. A pointed arch.
[Middle English ogif and French ogive, diagonal rib of a vault, both from Old French augive, probably from Vulgar Latin *obvitva, from Late Latin obvita, feminine past participle of obvire, ...
Diagonal ribs: The moldings which mark the diagonals in a rib vault. Other types of ribs: lierne, ridge, tierceron, transverse Diaper: A pattern formed by small, repeated geometrical motifs set adjacent to one another, ...
9, each course of stone was of uniform height from one side to the other; but, as the diagonal rib was longer than either the transverse or wall rib, the courses dipped towards the former, and at the apex of the vault were cut to fit one another.
In a quadripartite rib-vault, each bay has two pairs of diagonal ribs dividing the vault into four triangular cells. A sexpartite rib-vault, usually set over paired bays, has an extra pair of ribs springing from between the bays.
Another solution was to stilt the transverse ribs, or depress the diagonal ribs so that the centreline of the vault was horizontal, like a that of a barrel vault.
Block from which the diagonal ribs of a vault spring or start. The top of the springer is known as the skewback....
Crypto-porticus ...
Rib(bed) vault
A vault supported by or decorated with arched diagonal ribs.
Spandrel (also spandril)
(SPAN dril) The triangular space between the left or right exterior curve of an arch and the rectangular framework surrounding it.
Side Aisles of Sens Cathedral. Note that the transverse ribs and diagonal ribs are semi-circular. This creates a domed effect leading to pockets of space .
Notre Dame de Paris
Facade 1200-1250.
tierceron rib: secondary rib leading from a main springer in a vault to a place on the ridge-rib, below neither a transverse or diagonal rib.
torus: a semi-circular convex moulding, especially on the base of an Ionic column.
A rib vault is similar to a groin vault but the vault surface (or webbing) is supported by diagonal ribs at the intersections of the compartments. Tierceron and lierne vaults are rib vaults with added decorative ribs.
vault of square plan, bisected and strengthened by a transverse arch with solid spandrels, or as a series of transverse arches, one on each pair of nave piers, with the roof spaces filled in by curved surfaces of stone supported on diagonal ribs ...
 See also: Vault, Architecture, Rib, Gothic, Ornament
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