Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667
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1ſuch velocity, that they both finiſh one revolution in the ſame
time preciſely.
You may ſee this admirable, and to our

poſe accommodate experience, if putting in a Baſon of water a
Ball that will ſwim; and holding the Baſon in your hand, you
turn round upon your toe, for you ſhall immediatly ſee the Ball
begin to revolve in it ſelf with a motion, contrary to that of the
Baſon, and it ſhall finiſh its revolution, when that of the Baſon it
ſhall finiſh.
Now what other is the Earth than a penſil Globe
librated in tenuous and yielding aire, which being carried
bout in a year along the circumference of a great circle, muſt

needs acquire, without any other mover, a revolution about its
own centre, annual, and yet contrary to the other motion in like
manner annual?
You ſhall ſee this effect I ſay, but if afterwards
you more narrowly conſider it, you ſhall find this to be no real
thing, but a meer appearance; and that which you think to be
a revolution in it ſelf, you will find to be a not moving at all,
but a continuing altogether immoveable in reſpect of all that
which without you, and without the veſſel is immoveable: for if in
that Ball you ſhall make ſome mark, and conſider to what part of
the Room where you are, or of the Field, or of Heaven it is
ſituate, you ſhall ſee that mark in yours, and the veſſels
tion to look alwayes towards that ſame part; but comparing it to
the veſſel and to your ſelf that are moveable, it will appear to go
altering its direction, and with a motion contrary to yours, and
that of the veſſel, to go ſeeking all the points of its
tion; ſo that with more reaſon you and the baſon may be ſaid
to turn round the immoveable Ball, than that it moveth round
in the baſon.
In the ſame manner the Earth ſuſpended and
brated in the circumference of the Grand Orbe, and ſcituate in
ſuch ſort that one of its notes, as for example, its North Pole,
keth towards ſuch a Star or other part of the Firmament, it always
keepeth directed towards the ſame, although carried round by
the annual motion about the circumference of the ſaid Grand
Orbe.
This alone is ſufficient to make the Wonder ceaſe, and
to remove all difficulties.
But what will Simplicius ſay, if to
this non-indigence of the co-operating cauſe we ſhould adde
an admirable intrinſick vertue of the Terreſtrial Globe, of

ing with its determinate parts towards determinate parts of the
Firmament, I ſpeak of the Magnetick vertue conſtantly
pated by any whatſoever piece of Loade-ſtone.
And if every
minute particle of that S one have in it ſuch a vertue, who will

queſtion but that the ſame more powerfully reſides in this whole
Terreſtrial Globe, abounding in that Magnetick matter, and
which happily it ſelf, as to its internal and primary ſubſtance, is
nothing elſe but a huge maſſe of Loade-ſtone.

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