Dome of St. Peter's basilica found stronger than expected
Catholic World News - April 06, 2011
Structural engineers examining the dome of St. Peter's basilica have found that the building is even stronger than previously believed.
Using high-tech instruments, the study found that the stone of the dome is supported by 7 iron rings, whereas it had been thought to have only 2 such rings. The dome, built in the 16th century, was constructed using the equivalent of today's reinforced concrete.
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