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

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              <s>TO
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              The Right Honourable,
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              MONSIGNORE
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              D. </s>
              <s>Ferrante Ceſarini.</s>
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              <s>My Treatiſe of the MENSURATION of RUN­
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              NING WATERS, Right Honourable, and
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              moſt Noble Sir, hath not a greater Preroga­
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              tive than its having been the production of the
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              command of Pope
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              Vrban
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              VIII. when His Ho­
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              lineſs was pleaſed to enjoyn me to go with
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              Monſignore Corſini,
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              in the Viſitation that was
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              impoſed upon him in the year 1625. of the Waters of
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              Ferrara,
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              Bologna, Romagna,
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              and
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              Romagnola
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              ; for that, on that occaſion
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              applying my whole Study to my ſervice and duty, I publiſhed in
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              that Treatiſe ſome particulars till then not rightly underſtood and
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              conſidered (that I knew) by any one; although they be in them­
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              ſelves moſt important, and of extraordinary conſequence. </s>
              <s>Yet
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              I muſt render thanks to Your Lordſhip for the honour you have
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              done to that my Tract; but wiſh withal, that your Eſteem of it
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              may not prejudice the univerſal Eſteem that the World hath of
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              Your Honours moſt refined judgement.</s>
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              <s>As to that Point which I touch upon in the Concluſion, name­
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              ly, That the conſideration of the Velocity of Running Water ſup­
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              plyeth the conſideration of the ^{*} Length omitted in the common
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              way of meaſuring Running Waters; Your Lordſhip having com­
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              manded me that in favour of
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              Practiſe,
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              and for the perfect diſco­
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              very of the diſorder that commonly happeneth now adayes in
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              the diſtribution of the Waters of Fountains, I ſhould demon­
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              ſtrate that the knowledge of the Velocity ſerveth for the finding
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              of the Length: I have thought fit to ſatisfie your Command by
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              relating a Fable; which, if I do not deceive my ſelf, will make
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              out to us the truth thereof; inſomuch that the reſt of my Treatiſe
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              ſhall thereby alſo become more manifeſt and intelligible, even to </s>
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