Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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the fury of the South, and South-Weſt-Winds carryed ſuch
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abundance of ſand into the Mouth, or Out-let of
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Fiume morto,
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that it wholly ſtopt it up: eſpecially when the waters on
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Piſa
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ſide were low and ſhallow, And they think, that turning the
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Lake of
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Fiume morto
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into
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Serchio,
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and the
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Serchio
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maintaining
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continually its own Mouth with the force of its waters open to the
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Sea, and conſequently alſo
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Fiume morto,
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they would have had the
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Out-let clear and open; and in this manner they think, that the
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Plain of
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Piſa
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would have been freed from the waters. </
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<
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>The bu
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ſineſs paſſeth for current, at firſt ſight; but experience proveth
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the contrary, and Reaſon confirmeth the ſame: For the height
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of the water of thoſe Plains, was regulated by the height of the
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waters in the Mouth of
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Fiume morto
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; that is, The waters at the
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Mouth being high, the waters alſo do riſe in the fields; and when
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the waters at the Mouth are low, the waters of the fields do like
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wiſe abate: Nor is it enough to ſay, That the Out-let or Vent
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of
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Fiume morto
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is continual, but it muſt be very low: Now if
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Fiume morto
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did determine in
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Serchio,
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it is manifeſt that it
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would determine high; for
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Serchio
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terminating in the Sea, when
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ever it more and more aboundeth with water, and riſeth, it is ne
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ceſlary that alſo
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Fiume morto
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hath its level higher, and conſe
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quently ſhall keep the waters in the Plains higher. </
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<
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>Nay, it hath
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happened ſometimes (and I ſpeak it upon my own ſight) that
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Fiume morto
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hath reverſed its courſe upwards towards
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Piſa
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;
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which caſe will ever happen, whenſoever the
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Piſan
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waters chance
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to be lower than the level of thoſe of
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Serchio
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; for in that caſe
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the waters of
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Serchio
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return back upon the Plains thorow
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Fiume
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morto
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in ſuch ſort, that the Muddineſſes, and the
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Serchio
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have
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been obſerved to be carried by this return as farr as the Walls of
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Piſa
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; and then before ſuch time as ſo great waters can be aſ
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ſwaged, which come in with great fury, and go out by little and
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little, there do paſs very many days, and moneths, nay ſome
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times one being never able to find the waters of
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Serchio,
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when at the ſhalloweſt, ſo low as the Sea in level; (which is the
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loweſt place of the waters) it thence doth follow, that the wa
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ters of
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Fiume morto
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ſhould never at any time of the year, ſo long
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as they determine in
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Serchio,
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be ſo low, as they come to be when
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the ſame
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Fiume morto
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determineth in the Sea. </
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<
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>Tis true indeed,
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that the Mouth of
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Fiume morto,
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opened into the Sea, is ſubject to
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the inconvenience of being ſtopt up by the force of Winds: But
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in this caſe, it is neceſſary to take ſome pains in opening it; which
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may eaſily be done, by cutting that Sand a little which ſtayeth
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in the Mouth, after that the Wind is laid; and it is enough if you
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make a Trench little more than two Palms in breadth; for the
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water once beginning to run into it, it will in a few hours carry </
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