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See also: primary meaning, one of the series of elastic arched bones (costae) which See also: form the casing or framework of the thorax (see See also: SKELETON: Axial)
.
The word is in meaning transferred to many See also: objects resembling a See also: rib in shape or See also: function
.
In architecture, it is thus used of the See also: arches of See also: stone which in
See also: medieval See also: work constitute the skeleton of the vault, and carry the See also: shell or web
.
Although in the See also: Roman vault the rib played an important See also: element in its construction, it was generally hidden in the thickness of the vault and was made subservient to its geometrical surfaces
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The See also: Gothic masons, on the other See also: hand, reversed the See also: process, and not only made the vaulting See also: surface ' subservient to the rib, but by See also: mouldings rendered the latter a highly decorative feature
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The See also: principal ribs are the transverse (arc doubleau), the diagonal (arc ogive) and the See also: wall rib (See also: formeret)
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Those of less importance are the intermediate, the See also: ridge and lierne ribs
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The ridge-rib is one first introduced into the vault to resist the thrust of the intermediate ribs between the wall and diagonal ribs; it also served to mark the junction of the filling-in or web of vaults in those cases where the courses dipped toward the diagonal rib
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(See VAULT.) A lierne rib (the See also: term is borrowed from the French) is 'a See also: short rib, introduced into the vaulting in the Early Perpendicular See also: period, which coupled together the transverse and intermediate ribs; in the later period the " lierne " rib becomes one of the chief features of the " stella " vault (see further VAULT)
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