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In the construction of St. Sophia the Byzantines used baked clay and lava of Vesuvius, or pumice-stone.

— Rafael Guastavino Essay on The Theory and History of Cohesive Construction (1892)

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More quotes by Rafael Guastavino

Second, it is common to see the workmen walking over the arch, free from centres of any kind, some hours after it is built.

Essay on The Theory and History of Cohesive Construction (1892)

The cupolas of Persia are all constructed over brick walls, and are the continuation of the same wall with the same material.

Essay on The Theory and History of Cohesive Construction (1892)

I saw a grotto of immense grandeur, one of the most sublime and extraordinary works of nature.

Essay on The Theory and History of Cohesive Construction (1892)

When this arch rises only ten per cent of the full span it is very dangerous, because the development of the curve measures very little more than its chord C D.

Essay on The Theory and History of Cohesive Construction (1892)

Italy and Spain at this epoch had no text-books of their own; all were translations from the French and English works.

Essay on The Theory and History of Cohesive Construction (1892)

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Quote text and notes from Wikiquote: Rafael Guastavino (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.