Castelli, Benedetto
,
Of the mensuration of running waters
,
1661
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<
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>AXIOME I.</
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<
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>Sections equal, and equally ſwift, diſcharge equal quantities
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of Water in equal times.</
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<
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>AXIOME II.</
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>Sections equally ſwift, and that diſcharge equal quantity of
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Water, in equal time, ſhall be equal.</
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>AXIOME III.</
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<
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>Sections equal, and that diſcharge equal quantities of Water
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in equal times, ſhall be equally ſwift.</
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<
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>AXIOME IV.</
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>When Sections are unequal, but equally ſwift, the quanti
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ty of the Water that paſſeth through the firſt Section,
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ſhall have the ſame proportion to the quantity that paſ
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ſeth through the Second, that the firſt Section hath to the ſecond
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Section. </
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>Which is manifeſt, becauſe the velocity being the
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ſame, the difference of the Water that paſſeth ſhall be according
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to the difference of the Sections.</
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<
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>AXIOME V.</
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<
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>If the Sections ſhall be equal, and of unequal velocity, the
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quantity of the Water that paſſeth through the firſt, ſhall
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have the ſame proportion to that which paſſeth through the
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ſecond, that the velocity of the firſt Section, ſhall have to the
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velocity of the ſecond Section. </
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<
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>Which alſo is manifeſt, becauſe
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the Sections being equal, the difference of the Water which
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paſſeth, dependeth on the velocity.</
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PETITION.
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<
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>A Section of a River being given, we may ſuppoſe another
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equal to the given, of different breadth, heigth, and ve
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locity.</
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