Fig. 75.—.\nangement of the courses in anoff-set arch. … Fig. 76.—0(T-set semicircular arch. of a vault, are really laid horizontally one upon another, and I 12 A History of Art in Ancient Egypt. their lateral joints are vertical. (Fig. 76.) When the unitsof such vaults are properly proportioned they are stable in themselves, and they have
Art
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