Castelli, Benedetto
,
Of the mensuration of running waters
,
1661
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moreover confirmed with a moſt manifeſt experiment, may not
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onely make this my conjecture to be eſteemed far from true,
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but alſo to diſcredit with the World the reſt of this my Treatiſe:
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Nevertheleſſe I have at laſt reſolved not to be wanting to my
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ſelf, and to truth in a matter of it ſelf, and for other conſe
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quences moſt important; nor doth it ſeem to me requiſite in
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difficult matters, ſuch as theſe we have in hand, to refigne our
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ſelves to the common opinion, ſince it would be very ſtrange if
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the multitude in ſuch matters ſhould hit on the truth, nor ought
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that to be held difficult, in which even the vulgar do know the
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truth and right; beſides that I hope morever to prove all in ſuch
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ſort, that perſons of ſolid judgment, ſhall reſt fully perſwaded,
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ſo that they but keep in mind the principal ground and foundation
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of all this Treatiſe; and though that which I will propoſe, be a par
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ticular, as I have ſaid, pertaining onely to the intereſts of
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Ferara
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;
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yet nevertheleſſe from this particular Doctrine well underſtood,
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good judgement may be made of other the like caſes in general.</
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>I ſay then, for greater perſpecuity, and better underſtanding
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of the whole, That about thirteen miles above
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Ferara,
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near to
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Stellata,
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the main of P
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o,
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branching it ſelf into two parts, with one
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of its Arms it cometh cloſe to
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Ferara,
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retaining the name of the
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P
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o
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of
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Ferara
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; and here again it divideth it ſelf into two other
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branches, and that which continueth on the right hand, is called
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the P
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o
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of
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Argenta,
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and of
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Primaro
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; and that on the left the P
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o
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of
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Volana.
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But for that the bed of the P
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o
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of
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Ferara
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being here
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tofore augmented and raiſed, it followeth that it reſteth wholly
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deprived of the Water of the great P
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o,
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except in the time of its
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greater ſwelling; for in that caſe, this P
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o
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of
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Ferara
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being re
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ſtrained with a Bank near to
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Bondeno,
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would come alſo in the
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overflowings of the main P
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o,
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to be free from its Waters: But the
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Lords of
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Ferara
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are wont at ſuch time as the P
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o
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threateneth to
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break out, to cut the bank; by which cutting, there diſ
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gorgeth ſuch a Torrent of Water, that it is obſerved, that the
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main P
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o
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in the ſpace of ſome few hours abateth near a foot, and
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all perſons that I have ſpoken with hitherto, moved by this ex
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periment, think that it is of great profit and benefit to keep ready
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this Vent, and to make uſe of it in the time of its fullneſſe. </
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<
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>And
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indeed, the thing conſidered ſimply, and at the firſt appearance,
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it ſeemeth that none can think otherwiſe; the rather, for that
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many examining the matter narrowly, meaſure that body of
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Water which runneth by the Channel, or Bed of the P
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o
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of
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Fera
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ra,
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and make account, that the body of the Water of the great
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P
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o,
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is diminiſhed the quantity of the body of the Water which
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runneth by the P
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o
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of
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Ferara.
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But if we well remember what
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hath been ſaid in the beginning of the Treatiſe, and how much </
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