Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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courſe; and yet I had ſomething in my mind that I intended to
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have ſpoken upon that ſubject.</
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A pleaſant
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ampleaeclaring the
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invalidity of ſome
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Phyloſophical
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gumentations.
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<
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>SALV. </
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>We were about to demonſtrate that third motion
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ſcribed by
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Copernicus
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to the Earth to be no motion but a
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ſcence and maintaining of it ſelf immutably directed with its
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terminate parts towards the ſame & determinate parts of the
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verſe, that is a perpetual conſervation of the Axis of its diurnal
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revolution parallel to it ſelf, and looking towards ſuch and ſuch
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fixed ſtars; which moſt conſtant poſition we ſaid did naturally
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agree with every librated body ſuſpended in a fluid and yielding
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medium,
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which although carried about, yet did it not change
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rectionin reſpect of things external, but onely ſeemed to revolve in
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its ſelf, in reſpect of that which carryed it round, and to the
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veſſel in which it was tranſported. </
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<
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>And then we added to this
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ſimple and natural accident the magnetick virtue, whereby the
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ſelf Terreſtrial Globe might ſo much the more conſtantly keep it
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immutable, -----</
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<
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>SAGR. </
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>Now I remember the whole buſineſſe; and that which
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then came into my minde, & which I would have intimated, was a
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certain conſideration touching the ſcruple and objection of
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plicius,
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which he propounded againſt the mobility of the Earth,
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taken from the multiplicity of motions, impoſſible to be aſſigned
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to a ſimple body, of which but one ſole and ſimple motion,
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cording to the doctrine of
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Ariſtotle,
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can be natural; and that
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which I would have propoſed to conſideration, was the Magnet,
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to which we manifeſtly ſee three motions naturally to agree:
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one towards the centre of the Earth, as a
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Grave
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; the ſecond is
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the circular Horizontal Motion, whereby it reſtores and
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ſerves its Axis towards determinate parts of the Univerſe; and
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the third is this, newly diſcovered by
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Gilbert,
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of inclining its
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Axis, being in the plane of a Meridian towards the ſurface of the
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Earth, and this more and leſſe, according as it ſhall be diſtant
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from the Equinoctial, under which it is parallel to the Axis of
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the Earth. </
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>Beſides theſe three, it is not perhaps improbable,
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but that it may have a fourth, of revolving upon its own Axis, in
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caſe it were librated and ſuſpended in the air or other fluid and
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yielding
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Medium,
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ſo that all external and accidental impediments
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were removed, and this opinion
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Gilbert
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himſelf ſeemeth alſo to
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applaud. </
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<
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>So that,
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Simplicius,
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you ſee how tottering the Axiome
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of
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Ariſtotle
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is.</
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The ſeveral
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tural motions of
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the Magnet.
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<
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>SIMP. </
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<
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>This doth uot only not make againſt the Maxime, but
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not ſo much as look towards it: for that he ſpeaketh of a fimple
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body, and of that which may naturally conſiſt therewith; but
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you propoſe that which befalleth a mixt body; nor do you tell
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us of any thing that is new to the doctrine of
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Ariſtotle,
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for that </
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