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More than 5000 entries on the history, culture and life of Britain (published in 1993 by Macmillan, now out of print)
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rib vaulting
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Innovation at *Durham Cathedral in the late 11C, prefiguring the delicacy of *Gothic design. Rib vaults rise from points above adjacent pillars on each side of a nave, meeting in the centre like a four-branched starfish. Together they support the fabric of the roof, which can be of lighter material because not in itself structural.
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