Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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of natural bodies ſome are moveable by nature, and others
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veable; eſpecially having before defined Nature, to be the
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ciple of Motion and Reſt.</
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Finite and
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nate circular
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tions diſorder not
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the parts of the
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World.
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In the circular
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tion, every point in
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the circumference
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is the begining and
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end.
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Circular motion
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onely is uniform.
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Circular motion
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may be continued
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perpetually.
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Right motion
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not naturally be
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perpetual.
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Right motion
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ſigned to natural
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bodies, to reduce
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them to perfect
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der, when removed
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from their places.
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Reſt onely, and
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circular motion are
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apt to conſerve
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der.
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>SIMPL.
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Ariſtotle,
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though of a very perſpicacious wit, would
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not ſtrain it further than needed: holding in all his
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tations, that ſenſible experiments were to be preferred before
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any reaſons founded upon ſtrength of wit, and ſaid thoſe which
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ſhould deny the teſtimony of ſenſe deſerved to be puniſhed with
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the loſs of that ſenſe; now who is ſo blind, that ſees not the
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parts of the Earth and Water to move, as being grave,
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ly downwards, namely, towards the centre of the Univerſe,
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ſigned by nature her ſelf for the end and term of right motion
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deorſùm
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; and doth not likewiſe ſee the Fire and Air to move
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right upwards towards the Concave of the Lunar Orb, as to the
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natural end of motion
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ſurſùm
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? </
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>And this being ſo manifeſtly ſeen,
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and we being certain, that
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eadem est ratio totius & partium,
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why
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may we not aſſert it for a true and manifeſt propoſition, that the
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natural motion of the Earth is the right motion
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ad medium,
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and
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that of the Fire, the right
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à medio
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?</
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Senſible
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ments are to be
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ferred before
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mane argument
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tions.
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He who denies
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ſenſe, deſerves to
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be deprived of it.
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>Senſe ſheweth that
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things grave move
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to the
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medium,
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and
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the light to the
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concave.
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>SALV. </
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>The moſt that you can pretend from this your
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courſe, were it granted to be true, is that, like as the parts of the
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Earth removed from the whole, namely, from the place where
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they naturally reſt, that is in ſhort reduced to a depraved and
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ordered diſpoſure, return to their place ſpontaneouſly, and
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fore naturally in a right motion, (it being granted, that
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eadem
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ſit ratio totius & partium
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) ſo it may be inferred, that the
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Terreſtrial Globe removed violently from the place aſſigned
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it by nature, it would return by a right line. </
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>This, as I have
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ſaid, is the moſt that can be granted you, and that onely for want
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of examination; but he that ſhall with exactneſs reviſe theſe
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things, will firſt deny, that the parts of the Earth, in returning to
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its whole, move in a right line, and not by a circular or mixt; and
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really you would have enough to do to demonſtrate the
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ry, as you ſhall plainly ſee in the anſwers to the particular reaſons
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and experiments alledged by
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Ptolomey
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and
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Ariſtotle.
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Secondly,
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If another ſhould ſay that the
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parts
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of the Earth, go not in their
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motion towards the Centre of the World, but to unite with its
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Whole,
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and that for that reaſon they naturally incline towards the
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centre of the Terreſtrial Globe, by which inclination they
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ſpire to form and preſerve it, what other
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All,
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or what other Centre
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would you find for the World, to which the whole Terrene
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Globe, being thence removed, would ſeek to return, that ſo the
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reaſon of the
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Whole
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might be like to that of its
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parts
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? </
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<
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>It may be
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added, That neither
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Ariſtotle,
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nor you can ever prove, that the
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Earth
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de facto
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is in the centre of the Univerſe; but if any Centre </
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