Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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perſed thorow the Lake, it ſhall maintain the waters in the ſame,
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and in the Chanels much higher, as I ſhall prove hereafter; a
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thing that will make Navigation commodious; and that, which
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moreover is of great moment in our buſineſſe; thoſe Shelves
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of Mud which now diſcover themſelves at the time of Low
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Waters ſhall be alwayes covered, ſo that the putrefaction of
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the Air ſhall alſo be remedied.</
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>And laſtly, this abundance of Water being alwayes to diſ
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charge it ſelf into the Sea by the Ports, I do not doubt, but that
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their bottomes will be ſcoured. </
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>And that theſe effects muſt fol
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low, Nature her ſelf ſeemeth to perſwade, there remaining onely
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one great doubt, whether that abundance of Water that ſhall be
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brought into the Lake may be really ſufficient to make the Wa
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ters riſe ſo much as to keep the Shelves covered, and to facilitate
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Navigation, which ought to be at leaſt half a ^{*} Brace, or there
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abouts. </
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>And indeed it ſeemeth at firſt ſight to be impoſſible,
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that the ſole Water of the ^{*}
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Brent
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let into the Lake, and diſ
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perſed over the ſame, can occaſion ſo notable an height of water;
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and the more to confirm the difficulties, one might ſay, reducing
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the reaſon to calculation, that in caſe the
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Brent
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were 40. Bra
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ces broad, and two and an half high, and the breadth of the
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Lake were 20000. Braces, it would ſeem neceſſary that the
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height of the water of the
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Brent
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dilated and diſtended thorow
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the Lake would be but onely 1/200 of a Brace in height, which is
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imperceptible, and would be of no avail to our purpoſe; nay
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more, it being very certain that the
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Brent
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runneth very muddy
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and foul, this would occaſion very great miſchief, filling and
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contracting the Lake, and for that reaſon this remedy ought, as
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pernicious, to be totally excluded and condemned.</
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* A
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Venice
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Brace
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is 11/16 of our yard.</
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* A River of
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that name.</
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>I here confeſſe that I am ſurprized at the forme of the Argu
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ment, as if I were in a certain manner convinced, that I dare not
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adventure to ſay more, or open my mouth in this matter; but
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the ſtrength it ſelf of the Argument, as being founded upon
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the means of Geometrical and Arithmetical Calculation, hath
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opened me the way to diſcover a very crafty fraud that is couch
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ed in the ſame Argument, which fraud I will make out to any
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one that hath but any inſight in
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Geometry
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and
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Arithmetick.
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And as it is impoſſible, that ſuch an argument ſhould be produced
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by any but ſuch as have taſted of theſe, in ſuch affairs, moſt pro
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fitable, and moſt neceſſary Sciences; ſo do not I pretend to make
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my ſelf underſtood, ſave onely by ſuch, to whom I will evince
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ſo clearly, as that more it cannot be deſired, the errour and fraud
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wherein thoſe Ancients and Moderns have been, and alwayes
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are intangled, that have in any way yet handled this matter of
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conſidering the Meaſure and Quantity of the Waters that move. </
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