The Principles of Vaulting.
Vaulting of spaces of other forms than the mere square--Apsidal
aisles, St. John’s Chapel, Tower, and St. Bartholomew’s Church,
Smithfield--Chapter-house and crypt, Worcester--Round-arched vaulting
in its most normal form, as resulting from the _barrel_ vault and
its intersections--Short digression on another simple form of vault,
the _dome_--“Domed up” vaults--“Welsh” groining--The square or
polygonal dome--The Round-arched style of the twelfth century almost
perfect--First introduction of the Pointed arch into vaulting--Names
of the parts of groined vaulting--Two specimens in London of the
apsidal aisle, one in the Round-arched, the other in the Pointed-arched
style--Vaulting a polygon with a central pillar--_Ploughshare_
vaulting--The artistic sentiment and character of early Gothic
vaulting Page 161