Page:Vitruvius the Ten Books on Architecture.djvu/194

158 3. The vaulted ceilings will be more serviceable if built of ma­sonry; but if they are of framework, they should have tile work on the under side, to be constructed as follows. Let iron bars or arcs be made, and hang them to the framework by means of iron hooks set as close together as possible; and let these bars or arcs be placed at such distances apart that each pair of them may support and carry an unflanged tile. Thus the entire vaulting will be

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