Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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and concrete: therefore let
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Simplicius
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plead in excuſe of this
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Author; and whether he chinks that the Phyſicks can differ ſo
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very much from the Mathematicks.</
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<
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>SIMP. </
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>The ſubſtractions are in my opinion inſufficient to ſalve
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this difference, which is ſo extreamly too great to be reconciled:
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and in this caſe I have no more to ſay but that,
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Quandoque bonus
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dormitet Homerus.
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But ſuppoſing the calculation of ^{*}
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Salviatus
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to be more exact, and that the time of the deſcent of the ball
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were no more than three hours; yet me thinks, that coming from
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the concave of the Moon, which is ſo great a diſtance off, it would
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be an admirable thing, that it ſhould have an inſtinct of
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ing it ſelf all the way over the ſelf-ſame point of the Earth, over
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which it did hang in its departure thence and not rather be left a
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very great way behind.</
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* Not
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dus,
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as the Latine
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ha hit.</
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<
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>SALV. </
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>The effect may be admirable, and not admirable, but
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natural and ordinary, according as the things precedent may fall
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out. </
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>For if the ball (according to the Authors ſuppoſitions)
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whilſt it ſtaid in the concave of the Moon, had the circular motion
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of twenty four hours together with the Earth, and with the reſt of
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the things contained within the ſaid Concave; that very vertue
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which made it turn round before its deſcent, will continue it in
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the ſame motion in its deſcending. </
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>And ſo far it is from not
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ing pace with the motion of the Earth, and from ſtaying behind,
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that it is more likely to out-go it; being that in its approaches to
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the Earth, the motion of gyration is to be made with circles
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tinually leſſer and leſſer; ſo that the ball retaining in it ſelf that
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ſelf-ſame velocity which it had in the concave, it ought to
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pate, as I have ſaid, the
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vertigo
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or converſion of the Earth. </
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>But
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if the ball in the concave did want that circulation, it is not
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ged in deſcending to maintain it ſelf perpendicularly over that
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point of the Earth, which was juſt under it when the deſcent
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gan. </
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<
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>Nor will
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Copernicus,
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or any of his followers affirm the
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ſame.</
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<
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>SIMP. </
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<
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>But the Author maketh an objection, as you ſee,
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manding on what principle this circular motion of grave and light
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bodies, doth depend: that is, whether upon an internal or an
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ternal principle.</
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<
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>SALV. </
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>Keeping to the Probleme of which we ſpeak, I ſay,
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that that very principle which made the ball turn round, whil'ſt it
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was in the Lunar concave, is the ſame that maintaineth alſo the
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circulation in the deſcent: yet I leave the Author at liberty to
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make it internal or external at his pleaſure.</
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<
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>SIMP. </
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<
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>The Author proveth, that it can neither be inward nor
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outward.</
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<
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>SALV. </
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<
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>And I will ſay then, that the ball in the concave did </
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