Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667
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1courſe; and yet I had ſomething in my mind that I intended to
have ſpoken upon that ſubject.
A pleaſant
ampleaeclaring the
invalidity of ſome
Phyloſophical
gumentations.
SALV. We were about to demonſtrate that third motion
ſcribed by Copernicus to the Earth to be no motion but a
ſcence and maintaining of it ſelf immutably directed with its
terminate parts towards the ſame & determinate parts of the
verſe, that is a perpetual conſervation of the Axis of its diurnal
revolution parallel to it ſelf, and looking towards ſuch and ſuch
fixed ſtars; which moſt conſtant poſition we ſaid did naturally
agree with every librated body ſuſpended in a fluid and yielding
medium, which although carried about, yet did it not change
rectionin reſpect of things external, but onely ſeemed to revolve in
its ſelf, in reſpect of that which carryed it round, and to the
veſſel in which it was tranſported.
And then we added to this
ſimple and natural accident the magnetick virtue, whereby the
ſelf Terreſtrial Globe might ſo much the more conſtantly keep it
immutable, -----
SAGR. Now I remember the whole buſineſſe; and that which
then came into my minde, & which I would have intimated, was a
certain conſideration touching the ſcruple and objection of
plicius, which he propounded againſt the mobility of the Earth,

taken from the multiplicity of motions, impoſſible to be aſſigned
to a ſimple body, of which but one ſole and ſimple motion,
cording to the doctrine of Ariſtotle, can be natural; and that
which I would have propoſed to conſideration, was the Magnet,
to which we manifeſtly ſee three motions naturally to agree:
one towards the centre of the Earth, as a Grave; the ſecond is
the circular Horizontal Motion, whereby it reſtores and
ſerves its Axis towards determinate parts of the Univerſe; and
the third is this, newly diſcovered by Gilbert, of inclining its
Axis, being in the plane of a Meridian towards the ſurface of the
Earth, and this more and leſſe, according as it ſhall be diſtant
from the Equinoctial, under which it is parallel to the Axis of
the Earth.
Beſides theſe three, it is not perhaps improbable,
but that it may have a fourth, of revolving upon its own Axis, in
caſe it were librated and ſuſpended in the air or other fluid and
yielding Medium, ſo that all external and accidental impediments
were removed, and this opinion Gilbert himſelf ſeemeth alſo to
applaud.
So that, Simplicius, you ſee how tottering the Axiome
of Ariſtotle is.
The ſeveral
tural motions of
the Magnet.
SIMP. This doth uot only not make againſt the Maxime, but
not ſo much as look towards it: for that he ſpeaketh of a fimple
body, and of that which may naturally conſiſt therewith; but
you propoſe that which befalleth a mixt body; nor do you tell
us of any thing that is new to the doctrine of Ariſtotle, for that

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