Castelli, Benedetto
,
Of the mensuration of running waters
,
1661
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>OF THE
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MENSURATION
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OF
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Running Waters.</
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>SUPPOSITION I.</
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>Let it be ſuppoſed, that the banks of the Rivers of which
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we ſpeak be erected perpendicular to the plane of the up
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per ſuperficies of the River.</
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>SUPPOSITION II.</
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>We ſuppoſe that the plane of the bottome of the River, of
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which we ſpeak is at right angles with the banks.</
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>SUPPOSITION III.</
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>It is to be ſuppoſed, that we ſpeak of Rivers, when they are at
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ebbe, in that ſtate of ſhallowneſſe, or at flowing in that ſtate
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of deepneſſe, and not in their tranſition from the ebbe to the
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flowing, or fr m the flowing to the ebbe.</
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Declaration of Termes.
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>FIRST.</
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>If a River ſhall be cut by a Plane at right angles to the ſurface
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of the water of the River, and to the banks of the River,
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that ſame dividing Plane we call the Section of the River; and
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this Section, by the Suppoſitions above, ſhall be a right angled
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Parallelogram.</
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>SECOND.</
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>We call thoſe Sections equally Swift, by which the water runs
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with equal velocity; and more ſwift and leſs ſwift that
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Section of another, by which the water runs with greater or leſſe
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velocity.</
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