Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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yet it abideth ſtill in the ſame place, as if it were perpetually im
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moveable. </
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>But right Motion, which is properly
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ad locum, [to a
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place]
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can be aſcribed only to thoſe things which are out of their
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naturall place, being far from union with one another, and from
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unity with their whole, yea that are ſeperated and divided from
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it: Which being that it is contrary to the Nature and forme of
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the Univerſe, it neceſſarily followeth, that right Motion doth in
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ſhort ſute with thoſe things which are deſtitute of that perfection,
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that according to their proper Nature belongeth to them, and
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which by this ſame right Motion they labour to obtaine, untill
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they are redintigrated with their Whole, and with one another,
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and reſtored to their Naturall place; in which at the length,
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having obtained their perfection, they ſettle and remaine immove
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able. </
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>Therefore in right Motions there can be no Uniformity,
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nor ſimplicity; for that they vary by reaſon of the uncertaine
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Levity or Gravity of their reſpective Bodyes: for which cauſe
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they do not perſevere in the ſame Velocity or Tardity to the end
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which they had in the beginning. </
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>Hence we ſee that thoſe things
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whoſe weight maketh them tend downwards, do deſcend at firſt
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with a ſlow Motion; but afterwards, as they approach neerer
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and neerer to the Centre, they precipitate more and more ſwiftly.
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>And on the otherſide, thoſe things which by reaſon of their light
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neſs are carryed upwards (as this our Terreſtriall fire, which is no
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thing elſe but a ſmoak that burneth, and is inkindled into a flame)
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are no ſooner aſcended on high, but, in almoſt the ſelf-ſame mo
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ment, they fly and vaniſh out of fight; by reaſon of the rare
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faction and extenſion, that they as ſoon as they acquire, are freed
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from thoſe bonds which violently and againſt their own Nature
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kept them under, and deteined them here below. </
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>For which
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reaſon, it is very apparent, that no Right Motion can be called
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Simple, not only in regard that (as hath been ſaid) it is not
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^{*} even and uniforme, but alſo becauſe it is mixt with the Circu
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lar, which lurketh in the Right by an occult conſent,
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ſcilicet
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by
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reaſon of the Natural affection of the Parts to conforme unto
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their Whole. </
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>For when the Whole moveth Circularly, it is re
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quiſite likewiſe that the Parts, to the end that they may be uni
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ted to their Whole, (howbeit
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per accidens
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they are ſometimes
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moved with a Right Motion) do move (though not ſo appa
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rently) with a Circular Motion, as doth their Whole. </
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<
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>And thus
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at length we have evinced that Circular Motion only is Simple,
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Uniform and ^{*} Æquable, and of the ſame tenor [
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or rate
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] for that
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it is never deſtitute of its interne Cauſe: whereas on the contra
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ry, Right Motion, (which pertains to things both Heavy and
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Light) hath a Cauſe that is imperfect and deficient, yea that ari
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ſeth from Defect it ſelf, and that tendeth to, and ſeeketh after </
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