Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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equidiſtant from the point K, the Center of the World, which parts are G M,
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M L, L F, F H, H E.</
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* Or through.</
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<
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>RIC. </
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<
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>I underſtand you very well, as to this particular: But tell me a little; he
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ſaith that each of the parts of the Liquid is preſſed or repulſed by the Liquid that
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is above it, according to the Perpendicular: I know not what that Liquid is that
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lieth upon a part of another Perpendicularly.</
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<
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>NIC. </
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<
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>Imagining a Line that cometh from the Center of the Earth penetrating
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thorow ſome Water, each part of the Water that is in that Line he ſuppoſeth to
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be preſſed or repulſed by the Water that lieth above it in that ſame Line, and that
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that repulſe is made according to the ſame Line, (that is, directly towards the
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Center of the World) which Line is called a Perpendicular; becauſe every
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Right-Line that departeth from any point, and goeth directly towards the Worlds
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Center is called a Perpendicular. </
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<
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>And that you may the better underſtand me, let
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us imagine
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the Line KHO,
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and in that
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let us imagine
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ſeveral parts,
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as ſuppoſe RS,
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S T, T V, V H,
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H O. </
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<
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>I ſay,
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that he ſup
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poſeth that
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the part V H
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is preſſed by
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that placed a
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bove it, H O,
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according to
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the Line OK;
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the which
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O K, as hath been ſaid above, is called the Perpendicular paſſing thorow thoſe two
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parts. </
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<
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>In like manner, I ſay that the part T V is expulſed by the part V H, ac
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cording to the ſaid Line O K: and ſo the part S T to be preſſed by T V, according
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to the ſaid Perpendicular O K, and R S by S T. </
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<
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>And this you are to underſtand
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in all the other Lines that were protracted from the ſaid Point K, penetrating the
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ſaid Water, As for Example, in
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K
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G,
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K
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M,
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K
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L,
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K
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F,
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K
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E, and infinite others of the
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like kind.</
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<
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>RIC. Indeed,
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Dear Companion,
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this your Explanation hath given megreat ſa
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tisfaction; for, in my Judgment, it ſeemeth that all the difficulty of this Suppoſition
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conſiſts in theſe two particulars which you have declared to me.</
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<
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>NIC. </
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<
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>It doth ſo; for having underſtood that the parts E H, H F, F L, L M, and
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MG, determining in the Circumference of the ſaid Circle are equijacent, it is an
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eaſie matter to underſtand the foreſaid
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Suppoſition
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in Order, which ſaith,
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That it is
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ſuppoſed that the Liquid is of ſuch a nature, that the part thereof leſs preſſed or thrust is re
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pulſed by the more thruſt or preſſed.
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As for example, if the part E H were by chance
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more thruſt, crowded, or preſſed from above downwards by the Liquid, or ſome
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other matter that was over it, than the part H F, contiguous to it, it is ſuppoſed
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that the ſaid part H F, leſs preſſed, would be repulſed by the ſaid part E H. </
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<
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>And
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thus we ought to underſtand of the other parts equijacent, in caſe that they be
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contiguous, and not ſevered. </
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<
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>That each of the parts thereof is preſſed and repul.
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</
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<
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>ſed by the
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L
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iquid that lieth over it Perpendicularly, is manifeſt by that which was
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ſaid above, to wit, that it ſhould be repulſed, in caſe the
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L
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iquid be deſcending into
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any place, and thruſt, or driven any whither by another.</
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<
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>RIC. </
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<
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>I underſtand this Suppoſition very well, but yet me thinks that before
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the Suppoſition, the Author ought to have defined thoſe two particulars, which
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you firſt declared to me, that is, how we are to underſtand the parts of the
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L
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iquid
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equijacent, and likewiſe the Perpendicular.</
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