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

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            <p type="head">
              <s>PROPOS. V. PROB. III.</s>
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              <s>
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              Any River of any bigneſs, if being given to examine the
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              quantity of the Water that runneth thorow the River
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              in a time aſſigned.
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              </s>
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              <s>By what we have ſaid already in the two preceding Pro­
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              blems, we may alſo reſolve this that we have now before
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              us; and it is done, by diverting in the firſt place from the
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              great River a good big meaſurable Chanel, as is taught in the
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              ſecond Probleme, and obſerving the abatement of the River,
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              cauſed by the diverſion of the Chanel; and finding the proporti­
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              on that the Water of the Chanel hath to that of the River, then
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              let the Water of the Chanel be meaſured by the ſecond Pro­
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              bleme, and work as above, and you ſhall have your deſire.</s>
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              <s>CONSIDERATION. I.</s>
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              <s>And although it ſeemeth as if it might prove difficult, and
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              almoſt impoſſible to make uſe of the Regulator number, if
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              one be about to meaſure the water of ſome great River,
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              and conſequently would be impoſſible, or at leaſt very difficult
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              to reduce the Theory of the firſt Probleme into practice: Yet ne­
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              vertheleſs, I could ſay that ſuch great conceits of meaſuring the
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              water of a great River, are not to come into the minds of any
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              but great Perſonages, and potent Princes; of whom it is expected
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              for their extraordinary concerns, that they will make theſe kinde
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              of enquiries; as if here in
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              Italy
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              it ſhould be of the Rivers
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              Tyber,
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              Velino, Chiana, Arno, Serchio, Adice,
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              in which it ſeemeth real­
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              ly difficult to apply the
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              R
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              egulator, to finde exactly the quick
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              height of the
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              R
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              iver: But becauſe in ſuch like caſes ſometimes
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              it would turn to account to be at ſome charge, to come to the
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              exact and true knowledge of the quantity of water which that
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                <emph type="italics"/>
              R
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              iver carrieth, by knowledge whereof, other greater diſ­
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              burſments might afterwards be avoided, that would oft times be
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              made in vain; and prevent the diſguſts, which ſometimes happen
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              amongſt Princes: Upon this ground I think it will be well to
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              ſhew alſo the way how to make uſe of the
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              R
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              egulator in theſe
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              great
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              R
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              ivers; in which if we will but open our eyes, we ſhall meet
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              with good ones, and thoſe made without great coſt or labour,
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              which will ſerve our turn.</s>
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              <s>For upon ſuch like
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              R
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              ivers there are Wears, or Lockes made, </s>
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          </chap>
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