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

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                <pb xlink:href="068/01/064.jpg" pagenum="50"/>
              miliar Problems, from which we ſhall paſs to the Notions and
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              queſtions more ſubtil and curious; which will alſo prove profi­
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              table, and not to be ſleighted in this buſineſs of Waters.</s>
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              <s>PROPOSITION I. PROBLEME I.</s>
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              Achanel of Running-Water being given, the breadth
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              of which paſsing through a Regulator, is three
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              Palms; and the height one Palm, little more or
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              leſs, to meaſure what water paſſeth through the
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              Regulator in a time given.
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              <s>Firſt, we are to dam up the Chanel; ſo that there paſs not any
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              water below the Dam; then we muſt place in the ſide of the
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              Chanel, in the parts above the Regulator three, or four, or five
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              Bent-pipes, or Syphons, according to the quantity of the water
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              that runneth along the Chanel; in ſuch ſort, as that they may
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              drink up, or draw out of the Chanel all the water that the Cha­
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              nel beareth (and then ſhall we know that the Syphons drink up
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              all the water, when we ſee that the water at the Dam doth nei­
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              ther riſe higher, nor abate, but alwaies keepeth in the ſame Le­
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              vel.) Theſe things being prepared, taking the Inſtrument to
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              meaſure the time, we will examine the quantity of the water that
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              iſſueth by one of thoſe Syphons in the ſpace of twenty vibrations,
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              and the like will we do one by one with the other Syphons; and
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              then collecting the whole ſumme, we will ſay, that ſo much is
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              the water that paſſeth and runneth thorow the Regulator or
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              Chanel (the Dam being taken away) in the ſpace of twenty ſe­
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              cond minutes of an hour; and calculating, we may eaſily reduce
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              it to hours, dayes, months, and years: And it hath fallen to my
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              turn to meaſure this way the waters of Mills and Fountains, and I
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              have been well aſſured of its exactneſs, by often repeating the
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              ſame work.</s>
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              <s>CONSIDERATION.</s>
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              <s>And this method muſt be made uſe of in meaſuring the waters,
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              that we are to bring into Conducts, and carry into Cities
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              and Caſtles, for Fountains; and that we may be able afterwards
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              to divide and ſhare them to particular perſons juſtly; which will
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              prevent infinite ſuits and controverſies that every day happen in
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              theſe matters..</s>
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