Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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<
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>SIMP. </
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<
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>In my opinion, it cannot be denied, but that your
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courſe carrieth with it much of probability, arguing, as we ſay,
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ex ſuppoſitione,
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namely, granting that the Earth moveth with
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the two motions aſſigned it by
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Copernicus
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: but if that motion
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be diſproved, all that you have ſaid is vain, and inſignificant:
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and for the diſproval of that
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Hypotheſis,
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it is very manifeſtly
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hinted by your Diſcourſe it ſelf. </
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<
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>You, with the ſuppoſition of
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the two Terreſtrial motions, give a reaſon of the ebbing and
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flowing; and then again, arguing circularly, from the ebbing
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and flowing, draw the reaſon and confirmation of thoſe very
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motions; aud ſo proceeding to a more ſpecious Diſcourſe, you
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ſay that the Water, as being a fluid body, and not tenaciouſly
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annexed to the Earth, is not conſtrained punctually to obey
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ry of its motions, from which you afterwards infer its ebbing
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and flowing, Now I, according to your own method, argue
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the quite contrary, and ſay; the Air is much more tenuous, and
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fluid than the Water, and leſſe annexed to the Earths
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es, to which the Water, if it be for nothing elſe, yet by reaſon
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of its gravity that preſſeth down upon the ſame more than the
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light Air, adhereth; therefore the Air is much obliged to
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low the motions of the Earth: and therefore were it ſo, that the
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Earth did move in that manner, we the inhabitants of it, and
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carried round with like velocity by it, ought perpetually to feel
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a Winde from the Eaſt that beateth upon us with intolerable
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force. </
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>And that ſo it ought to fall out, quotidian experience
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ſureth us: for if with onely riding poſt, at the ſpeed of eight or
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ten miles an hour in the tranquil Air, the incountering of it with
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our face ſeemeth to us a Winde that doth not lightly blow upon
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us, what ſhould we expect from our rapid courſe of 800. or a
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thouſand miles an hour, againſt the Air, that is, free from that
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motion? </
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<
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>And yet, notwithſtanding we cannot perceive any
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thing of that nature.</
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The Hypotheſir
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of the Earths
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bility taken in
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vour of the Tide,
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oppoſed.
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<
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>SALV. </
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>To this objection that hath much of likelihood in it, I
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reply, that its true, the Air is of greater tenuity and levity; and,
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by reaſon of its levity, leſſe adherent to the Earth than Water ſo
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much more grave and ^{*}bulky; but yet the conſequence is falſe
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that you infer from theſe qualities; namely, that upon account
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of that its levity, tenuity, and leſſe adherence to the Earth, it
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ſhould be more exempt than the Water from following the
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Terreſtrial Motions; ſo as that to us, who abſolutely pertake of
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of them, the ſaid exemption ſhould be ſenſible and manifeſt;
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nay, it happeneth quite contrary; for, if you well remember, the
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cauſe of the ebbing and flowing of the Water aſſigned by us,
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conſiſteth in the Waters not following the unevenneſſe of the
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motion of its Veſſel, but retaining the
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impetus
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conceived before, </
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