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Description

 

An arch inserted into a space to strengthen the overall structure and resist inward pressure.

 

During the building of the cathedral tower, masons inserted six strainer arches to help take the weight of the new tower.  Too many strainer arches could result in undue rigidity that weakened the overall structure.

 

Local example (click to enlarge)

Strainer arch

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Cathedral, main strainer arch

 

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Cathedral, showing five of the six strainer arches