Galilei, Galileo
,
The systems of the world
,
1661
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<
archimedes
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<
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<
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<
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065/01/139.jpg
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pagenum
="
131
"/>
therefore if that ſtone let fall from the round top, ought to
<
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low the motion of the ſhip, that effect ſhould be aſcribed to the
<
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Air, and not to the vertue impreſſed. </
s
>
<
s
>But you preſuppoſe that
<
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the Air doth not follow the motion of the ſhip, but is tranquil.
<
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</
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>
<
s
>Moreover, he that letteth it fall, is not to throw it, or to give
<
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/>
it
<
emph
type
="
italics
"/>
impetus
<
emph.end
type
="
italics
"/>
with his arm, but ought barely to open his hand and let
<
lb
/>
it go; and by this means, the ſtone, neither through the vertue
<
lb
/>
impreſſed by the projicient, nor through the help of the Air,
<
lb
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ſhall be able to follow the ſhips motion, and therefore ſhall be
<
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/>
left behind.</
s
>
</
p
>
<
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type
="
margin
">
<
s
>
<
margin.target
id
="
marg317
"/>
<
emph
type
="
italics
"/>
The project
<
lb
/>
cording to
<
emph.end
type
="
italics
"/>
<
lb
/>
tle,
<
emph
type
="
italics
"/>
is not moved by
<
lb
/>
vertue impreſſed,
<
lb
/>
but by the
<
emph.end
type
="
italics
"/>
medium.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SALV. </
s
>
<
s
>I think then that you would ſay, that if the ſtone be
<
lb
/>
not thrown by the arm of that perſon, it is no longer a
<
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jection.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SIMPL. </
s
>
<
s
>It cannot be properly called a motion of projection.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SALV. </
s
>
<
s
>So then that which
<
emph
type
="
italics
"/>
Ariſtotle
<
emph.end
type
="
italics
"/>
ſpeaks of the motion, the
<
lb
/>
moveable, and the mover of the projects, hath nothing to do
<
lb
/>
with the buſineſſe in hand; and if it concern not our purpoſe,
<
lb
/>
why do you alledg the ſame?</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SIMP. </
s
>
<
s
>I produce it on the oceaſion of that impreſſed vertue,
<
lb
/>
named and introduced by you, which having no being in the
<
lb
/>
World, can be of no force; for
<
emph
type
="
italics
"/>
non-entium nullæ ſunt
<
lb
/>
nes
<
emph.end
type
="
italics
"/>
; and therefore not onely of projected, but of all other
<
lb
/>
ternatural motions, the moving cauſe ought to be aſcribed to the
<
lb
/>
<
emph
type
="
italics
"/>
medium,
<
emph.end
type
="
italics
"/>
of which there hath been no due conſideration had;
<
lb
/>
and therefore all that hath been ſaid hitherto is to no purpoſe.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SALV. </
s
>
<
s
>Go to now, in good time. </
s
>
<
s
>But tell me, ſeeing that
<
lb
/>
your inſtance is wholly grounded upon the nullity of the vertue
<
lb
/>
impreſſed, if I ſhall demonſtrate to you, that the
<
emph
type
="
italics
"/>
medium
<
emph.end
type
="
italics
"/>
hath
<
lb
/>
nothing to do in the continuation of projects, after they are
<
lb
/>
patated from the projicient, will you admit of the impreſſed
<
lb
/>
tue, or will you make another attempt to overthrow it?</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SIMP. </
s
>
<
s
>The operation of the
<
emph
type
="
italics
"/>
medium
<
emph.end
type
="
italics
"/>
being removed, I ſee not
<
lb
/>
how one can have recourſe to any thing elſe ſave the faculty
<
lb
/>
preſſed by the mover.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SALV. </
s
>
<
s
>It would be well, for the removing, as much as is
<
lb
/>
poſſible, the occaſions of multiplying contentions, that you
<
lb
/>
would explain with as much diſtinctneſſe as may be, what is that
<
lb
/>
operation of the
<
emph
type
="
italics
"/>
medium
<
emph.end
type
="
italics
"/>
in continuing the motion of the
<
lb
/>
<
arrow.to.target
n
="
marg318
"/>
</
s
>
</
p
>
<
p
type
="
margin
">
<
s
>
<
margin.target
id
="
marg318
"/>
<
emph
type
="
italics
"/>
Operation of the
<
emph.end
type
="
italics
"/>
<
lb
/>
medium
<
emph
type
="
italics
"/>
in
<
lb
/>
ing the motion of
<
lb
/>
the project.
<
emph.end
type
="
italics
"/>
</
s
>
</
p
>
<
p
type
="
main
">
<
s
>SIMP. </
s
>
<
s
>The projicient hath the ſtone in his hand, and with
<
lb
/>
force and violence throws his arm, with which jactation the
<
lb
/>
ſtone doth not move ſo much as the circumambient Air; ſo that
<
lb
/>
when the ſtone at its being forſaken by the hand, findeth it ſelf
<
lb
/>
in the Air, which at the ſame time moveth with impetouſity, it
<
lb
/>
is thereby born away; for, if the air did not operate, the ſtone
<
lb
/>
would fall at the foot of the projicient or thrower.</
s
>
</
p
>
</
chap
>
</
body
>
</
text
>
</
archimedes
>