Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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that I fear I ſhall have but a ſmall part of it left free and
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gaged, to apply to the principal matter that is treated of, and
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which of it ſelf is but even too obſcure and intricate: So that
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I intreat you to vouchſafe me, having once diſpatcht the buſineſs
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of the ebbings and flowings, to do this honour to my houſe (and
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yours) ſome other dayes, and to diſcourſe upon the ſo many other
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Problems that we have left in ſuſpence; and which perhaps are
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no leſs curious and admirable, than this that hath been diſcuſſed
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theſe dayes paſt, and that now ought to draw to a
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cluſion.</
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<
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>SALV. </
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>I ſhall be ready to ſerve you, but we muſt make more
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than one or two Seſſions; if beſides the other queſtions reſerved
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to be handled apart, we would diſcuſſe thoſe many that pertain
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to the local motion, as well of natural moveables, as of the
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ed: an Argument largely treated of by our
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Lyncean
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mick.
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But turning to our firſt purpoſe, where we were about to
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declare, That the bodies moving circularly by a movent virtue,
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which continually remaineth the ſame, the times of the
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tions were prefixt and determined, and impoſſible to be made
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longer or ſhorter, having given examples, and produced
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ments thereof, ſenſible, and feaſible, we may confirm the ſame
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truth by the experiences of the Celeſtial motions of the Planets;
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in which we ſee the ſame rule obſerved; for thoſe that move by
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greater Circles, confirm longer times in paſſing them. </
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<
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>A moſt
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pertinent obſervation of this we have from the
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Medicæan
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nets, which in ſhort times make their revolutions about
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Jupiter
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:
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Inſomuch that it is not to be queſtioned, nay we may hold it for
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ſure and certain, that if for example, the Moon continuing to be
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moved by the ſame movent faculty, ſhould retire by little and
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little in leſſer Circles, it would acquire a power of abreviating
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the times of its Periods, according to that
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Pendulum,
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of which in
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the courſe of its vibrations, we by degrees ſhortned the cord, that
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is contracted the Semidiameter of the circumferences by it paſſed.
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<
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>Know now that this that I have alledged an example of it in the
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Moon, is ſeen and verified eſſentially in fact. </
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<
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>Let us call to mind,
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that it hath been already concluded by us, together with
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Coperni-
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cus,
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That it is not poſſible to ſeparate the Moon from the Earth,
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about which it without diſpute revolveth in a Moneth: Let us
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remember alſo that the Terreſtrial Globe, accompanyed alwayes
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by the Moon, goeth along the circumference of the Grand Orb
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about the Sun in a year, in which time the Moon revolveth about
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the Earth almoſt thirteen times; from which revolution it
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eth, that the ſaid Moon ſometimes is found near the Sun; that is,
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when it is between the Sun and the Earth, and ſometimes
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much more remote, that is, when the Earth is ſituate between </
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