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9Thus adjusting the direction of the tubes, both in the descents and acclivities, the work will never be dislodged. For a great rush of air is generated in an aqueduct, strong enough to break even stones, unless the water is softly and sparingly let down from the head, and unless in elbows or bending joints it be restrained by means of ligatures, or a weight of ballast. In other respects it is similar to one with leaden pipes. When the water is first let down from the head, ashes are put in which will stop those joints not sufficiently coated. Earthen pipes have these advantages, first as to the work; next, that if damaged any one can repair it.
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