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Encyclopedia Britannica



KEYSTONE

This article appears in Volume V15, Page 769 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: JUN-KHA
KEYSTONE , the central voussoir of an
arch
  (q.v.). The Etruscans and the Romans emphasized its importance by decorating it with figures and busts, and, in their triumphal
arches
 , projected it forward and utilized it as an additional support to the
architrave
  above. Throughout the Italian period it forms an important
element
  in the
design
 , and serves to connect the arch with the
horizontal
  mouldings running above it. In
Gothic
  architecture there is no keystone, but the junction of pointed ribs at their summit is sometimes decorated with a boss to
mask
  the intersection.


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