Castelli, Benedetto, Of the mensuration of running waters, 1661

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              to be Courted by ſundry Princes, and great Prelates. </s>
              <s>In particu­
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              lar about the beginning of the Year 1623. and before his Invita­
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              tion to
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              ROME
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              he was employed by Prince
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              Ferdinando I,
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              Grand
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              Duke of
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              TUSCANY,
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              to remedy the Diſorders which at that
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              time happened in the Valley of
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              PISA
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              in the Meadows that lye
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              upon the Banks of
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              Serchio
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              and
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              Fiume Morto:
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              and in the pre­
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              ſence of the Grand Duke, Grand Dutcheſſe Mother, the Commiſ­
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              ſioners of Sewers, and ſundry other Perſons in a few hours he
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              made ſo great a progreſſe in that affair, as gave his Moſt Serene
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              Highneſſe high ſatisfaction, and gained himſelf much Honour.
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              <s>§.
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              No ſooner had he in his fore-mentioned Voiage to
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              RO­
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              MAGNA
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              (which was but few Moneths after, in the ſame
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              Year) committed his Conceptions to paper, but he communicated
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              them to certain of his Friends. </s>
              <s>In which number we finde
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              Signo­
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              re Ciampoli
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              Secretary of the Popes Private Affaires; whom in
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              the beginning of the Firſt Book he gratefully acknowledgeth to
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              have been contributary, in his Purſe, towards defraying the
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              charge of Experiments, and in his Perſon, towards the debating
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              and compleating of Arguments upon this Subject. </s>
              <s>Some few years
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              after the Importunity of Friends, and the Zeal he had for the
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              Publique Good prevailed with him to preſent the World with his
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              Firſt Diſcourſe, accompanied with a Treatiſe of the Geometrical
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              Demonſtrations of his whole Doctrine. </s>
              <s>What Reception it found
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              with the Judicious muſt needs be imagined by any one that hath
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              obſerved how
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              Novelty
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              and
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              Facility
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              in conjunction with
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              Verity
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              make a Charm of irreſiſtable Operation.
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              </s>
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              <s>§. </s>
              <s>New
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              it was, for that no man before him had ever attemp­
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              ted to Demonſtrate all the three Dimenſions, to wit, the Length,
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              Breadth and Profundity, of this Fluid and Current Ele­
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              ment. </s>
              <s>And he detecteth ſuch groſſe Errours in thoſe few that
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              had untertook to write upon the Subject (of which he inſtan­
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              ceth in
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              Frontinus
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              and
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              Fontana,
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              as thoſe that include the rest)
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              and delivereth ſuch ſingular and unheard-of Paradoxes (for ſo
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              they ſound in Vulgar Eares) as cannot but procure unſpeakable
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              delight to his Reader.
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              </s>
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              <s>§. </s>
              <s>Eafie
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              it is likewiſe and
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              True;
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              and that upon ſo Familiar
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              Experiments and Manifeſt Demonſtrations, that I have oft que­
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              ſtioned with my ſelf which merited the greater wonder, he, for
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              diſcovering, or all men that handled the Argument before him
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              for not diſcovering a Doctrine of ſuch ſtrange Facility and Infal­
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              libility. </s>
              <s>But yet as if our Authour deſigned to oblige the whole
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              World to him by ſo excellent a
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              Preſent,
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              he ſelects a Subject that
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              he knew would be carreſſed by all perſons of Nobler Souls, upon
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              the accounts afore-named, and by all Mankind in General, as
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              gratifying them in their much adored Idol
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              Utility.
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              And to ren-
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              </s>
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