Galilei, Galileo, The systems of the world, 1661

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SALV. As to the impediment of the Air, I do not deny it
you
; and if the thing falling were a light matter, as a feather,
or
a lock of wool, the retardation would be very great, but in
an
heavy ſtone is very exceeding ſmall.
And you your ſelf but
even
now did ſay, that the force of the moſt impetuous wind
ſufficeth
not to ſtir a great ſtone from its place; now do but
ſider
what the calmer air is able to do, being encountred by a
ſtone
no more ſwift than the whole ſhip.
Nevertheleſſe, as I ſaid
before
, I do allow you this ſmall effect, that may depend upon
ſuch
an impediment; like as I know, that you will grant to me,
that
if the air ſhould move with the ſame velocity that the ſhip
and
ſtone hath, then the impediment would be nothing at all.
As to the other of the additional motion downwards; in the firſt
place
it is manifeſt, that theſe two, I mean the circular, about
the
centre, and the ſtreight, towards the centre, are not
ries
, or deſtructive to one another, or incompatible.
Becauſe that
as
to the moveable, it hath no repugnance at all to ſuch motions,
for
you your ſelf have already confeſt the repugnance to be
gainſt
the motion which removeth from the centre, and the
nation
to be towards the motion which approacheth to the centre.
Whence it doth of neceſſity follow, that the moveable hath
ther
repugnance, nor propenſion to the motion which neither
proacheth
, nor goeth from the centre, nor conſequently is there
any
cauſe for the diminiſhing in it the faculty impreſſed.
And
aſmuch
as the moving cauſe is not one alone, which it hath
tained
by the new operation of retardation; but that they are
two
, diſtinct from each other, of which, the gravity attends
ly
to the drawing of the moveable towards the centre, and the
vertue
impreſs't to the conducting it about the centre, there
maineth
no occaſion of impediment.

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