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Dropped keystone at Colditz Castle
Dropped keystone at Colditz Castle
Keystone from the palazzo Borgazzi (Milan, Italy)
Keystone from the palazzo Borgazzi (Milan, Italy)
Keystone much enlarged for decorative effect, and carrying a coat of arms, Barcelona
Keystone much enlarged for decorative effect, and carrying a coat of arms, Barcelona
The York Minster Chapter House rib-vault ceiling with central and peripheral keystones
The York Minster Chapter House rib-vault ceiling with central and peripheral keystones
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Gothic rib vault ceiling of the Saint-Séverin church in Paris
Gothic rib vault ceiling of the Saint-Séverin church in Paris
In a pitched-brick vault the bricks lean (are pitched) against an existing wall.
In a pitched-brick vault the bricks lean (are pitched) against an existing wall.
St Paul's Cathedral Choir looking east, London
St Paul's Cathedral Choir looking east, London
Pointed barrel vault showing direction of lateral forces
Pointed barrel vault showing direction of lateral forces