Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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think of returning this Torrent into the divided P
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o,
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by reaſon of
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the peril that would thence redound to this City.</
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>And that going by
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Torre del Fondo,
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through
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Sanmartina
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to
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the Mouth
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de Maſi
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by the Chappel of
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Vigarano
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unto the Sea, it is
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by this way 70. miles; nor is the Fall greater than 26. 5. 6. Feet, ſo
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that it would come to fall but 4. inches & an half, or thereabouts
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in a mile; whereas the common opinion of the skilfull (to the
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end that the Torrents may not depoſe their ſand that they bring
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with them in Land-Floods) requireth the twenty fourth part of
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the hundredth part of their whole length, which in our caſe,
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accounting according to the meaſure of theſe places, is 16. inches
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a ^{*} mile; whereupon the ſinking of the Mud and Sand would
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moſt certainly follow, and ſo an immenſe heightning of the Line
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of the Bottom, and conſequently a neceſſity of raiſing the Banks,
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the impoſſibility of maintaining them, the danger of breaches
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and decayes, things very prejudicial to the
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Iſlets
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of this City, and
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of
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San Giorgio,
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the obſtruction of the Drains, which from the
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Tower of
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Tienne
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downwards, fall into the ſaid Chanel; to wit,
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thoſe of the Sluices of
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Goro,
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and the Drains, of the Meadows of
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Ferrara
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: And moreover, the damages that would ariſe unto the
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ſaid
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Iſlet
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of S.
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Giorgio,
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and the Valleys of
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Comachio,
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by the wa
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ters that ſhould enter into the
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Goro
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or Dam of the Mills of
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Belri
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guardo,
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thorow the Trenches of
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Quadrea,
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which cannot be ſtopt,
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becauſe they belong to the Duke of
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Modena,
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who hath right of
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diverting the waters of that place at his pleaſure to the work of
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turning Mills.</
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* The inch of
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theſe places is
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ſomewhat bigger
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than ours.</
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>The greater part of which Objections, others pretend to prove
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frivolous, by ſaying, that its running there till at the laſt it was
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turned another way, is a ſign that it had made ſuch an elevation
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of the Line, of its Bed as it required; denying that it needeth
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ſo great a declivity as is mentioned above; and that for the fu
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ture it would riſe no more.</
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<
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>That the ſaid Dra ns and Ditches did empty into the ſame,
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whilſt P
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o
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was there; ſo that they muſt needs be more able to do
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ſo when onely
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Reno
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runs that way.</
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>That there would no Breaches follow, or if they did, they
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would be onely of the water of
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Reno,
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which in few hours might
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be taken away (in thoſe parts they call damming up of Breaches,
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and mending the Bank,
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taking away the Breaches
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) and its a que
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ſtion whether they would procure more inconvenience than bene
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fit, for that its Mud and Sand might in many places, by filling
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them up, occaſion a ſeaſonable improvement.</
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>Now omitting to diſcourſe of the ſolidity of the reaſons on the
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oneſide, or on the other, I will produce thoſe that move me to
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ſuſpend my allowance of this deſign.</
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