Squinch

This article is about an architectural feature. For square-inch analysis, see Square-inch analysis.

Squinches supporting a dome in Odzun Basilica, Armenia, early 8th century

A squinch in architecture is a construction filling in the upper angles of a square room so as to form a base to receive an octagonal or spherical dome. Another solution of this structural problem was provided by the pendentive.

Construction

Squinches may be formed by masonry built out from the angle in corbelled courses, by filling the corner with a vise placed diagonally, or by building an arch or a number of corbelled arches diagonally across the corner.

History in the Middle East

Squinch in the Palace of Ardashir the Sassanian king

The dome chamber in the palace of Ardashir, the Sassanid king, in Firuzabad, Iran is the earliest surviving example of the use of the squinch, suggesting that the squinch may have been invented in Persia. After the rise of Islam, it was used in the Middle East in both eastern Romanesque and Islamic architecture. It remained a feature of Islamic architecture, especially in Iran, and was often covered by corbelled stalactite-like structures known as muqarnas.

History in Western Europe

It spread to the Romanesque architecture of western Europe, one example being the Normans' 12th-century church of San Cataldo, Palermo in Sicily. This has three domes, each supported by four doubled squinches.

Etymology

The word squinch comes from the Persian word "سه+کنج) "سکنج) (sekonj).

In popular culture

The science fiction novel Implied Spaces by Walter Jon Williams uses squinches as an example of parts of a structure whose construction is implied and made necessary to facilitate the construction of other parts; areas of a created world or universe which are implied (and thus created) as a by-product of the creation of other areas.

See also

• Pendentive

External links

• Media related to Squinches at Wikimedia Commons