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6To remedy this evil, the thickness of the wall must be proportioned to the weight of earth against it, and, in front, counterforts (anterides) or buttresses (erismæ) are carried up with the wall, at a distance from each other equal to the height of the foundations, and of the same width as the foundations. Their projection at bottom is equal in thickness to the wall, and diminishing as they rise, their projection at top is equal to the thickness of the work:
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