Cyma Recta
The other sheltering moulding, the Cyma Recta, is a curve of double flexure with upper fillet. Its proper employment is as the crowning member of the cornice, though, like the Cavetto, it is employed in other positions, notably as a plinth moulding, when it appears in a reversed position.
The projection is about equal to the height of the curved profile, the height of the crowning fillet being from one-fourth to one-fifth of the whole.
Bracketing Mouldings
The supporting mouldings are the Ovolo and the Cyma Reversa.
The Ovolo
The Ovolo is composed of a full convex curve, either a quarter circle or slightly elliptic, which in height is equal to projection; and a fillet at base one-fifth the total height. Frequently this lower member is in the form of a half round bead of the same dimension as the fillet.
As a Bracketing moulding the Ovolo occurs in the capital of the Doric column, and in the Ionic and Corinthian cornices under the corona or facia, and is employed in other positions, where the sense of support is justified.
Cyma Reversa
The Cyma Reversa, like the Cyma Recta, is a curve of double flexure, and is headed with a fillet one-third to one-fourth the total height. The projection is equal to the height of curved profile.