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12I must not omit to speak of the formation of harbours, but explain in what manner ships are secured therein in stormy weather. If they are naturally well situated, and have rocks or long promontories jutting out, which from the shape of the place, form curves or angles, they are of the greatest utility; because, in that case, nothing more is necessary than to construct porticos and arsenals round them, or passages to the markets; and then erect a tower on each side, wherefrom chains may be suspended across by means of machinery.
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