Galilei, Galileo
,
Discourse concerning the natation of bodies
,
1663
Text
Text Image
XML
Document information
None
Concordance
Figures
Thumbnails
page
|<
<
of 77
>
>|
<
archimedes
>
<
text
>
<
body
>
<
chap
>
<
pb
pagenum
="
426
"/>
<
p
type
="
margin
">
<
s
>
<
margin.target
id
="
marg1447
"/>
<
emph
type
="
italics
"/>
T
<
emph.end
type
="
italics
"/>
he Authors
<
lb
/>
confutation of
<
lb
/>
the Peripateticks
<
lb
/>
Cauſes of
<
lb
/>
tion &
<
lb
/>
on.</
s
>
</
p
>
<
p
type
="
margin
">
<
s
>
<
margin.target
id
="
marg1448
"/>
Water & other
<
lb
/>
fluids void of
<
lb
/>
Reſiſtance
<
lb
/>
gainſt Diviſion.</
s
>
</
p
>
<
p
type
="
margin
">
<
s
>
<
margin.target
id
="
marg1449
"/>
<
emph
type
="
italics
"/>
T
<
emph.end
type
="
italics
"/>
he
<
lb
/>
nancy of
<
lb
/>
ments in
<
lb
/>
ables to be
<
lb
/>
ſidered only in
<
lb
/>
relation to their
<
lb
/>
excefs or defect
<
lb
/>
of Gravity in
<
lb
/>
reference to the
<
lb
/>
<
emph
type
="
italics
"/>
Medium.
<
emph.end
type
="
italics
"/>
</
s
>
</
p
>
<
p
type
="
margin
">
<
s
>
<
margin.target
id
="
marg1450
"/>
<
emph
type
="
italics
"/>
T
<
emph.end
type
="
italics
"/>
he
<
lb
/>
ate Cauſe of
<
lb
/>
tation is that the
<
lb
/>
Moveable is leſs
<
lb
/>
grave than the
<
lb
/>
Water.</
s
>
</
p
>
<
p
type
="
margin
">
<
s
>
<
margin.target
id
="
marg1451
"/>
<
emph
type
="
italics
"/>
T
<
emph.end
type
="
italics
"/>
he
<
emph
type
="
italics
"/>
P
<
emph.end
type
="
italics
"/>
<
lb
/>
ticks alledge for
<
lb
/>
the reaſon of
<
lb
/>
Natation the
<
lb
/>
Cauſe of the
<
lb
/>
Cauſe.</
s
>
</
p
>
<
p
type
="
margin
">
<
s
>
<
margin.target
id
="
marg1452
"/>
Gravity a
<
lb
/>
Cauſe moſt
<
lb
/>
ſpicuous to
<
lb
/>
ſence:</
s
>
</
p
>
<
p
type
="
main
">
<
s
>Let us not then deſpiſe thoſe Hints, though very dark, which
<
lb
/>
Reaſon, after ſome contemplation, offereth to our Intelligence,
<
lb
/>
lets be content to be taught by
<
emph
type
="
italics
"/>
Archimedes,
<
emph.end
type
="
italics
"/>
that then any Body
<
lb
/>
<
arrow.to.target
n
="
marg1453
"/>
<
lb
/>
ſubmerge in water, when it ſhall be ſpecifically more grave than it
<
lb
/>
and that if it ſhall be leſs grave, it ſhall of neceſſity ſwim, and
<
lb
/>
<
arrow.to.target
n
="
marg1454
"/>
<
lb
/>
that it will reſt indifferently in any place under water, if its
<
lb
/>
be perfectly like to that of the
<
lb
/>
<
arrow.to.target
n
="
marg1455
"/>
</
s
>
</
p
>
<
p
type
="
margin
">
<
s
>
<
margin.target
id
="
marg1453
"/>
Lib 1. of
<
lb
/>
tation Prop. </
s
>
<
s
>7.</
s
>
</
p
>
<
p
type
="
margin
">
<
s
>
<
margin.target
id
="
marg1454
"/>
Id. </
s
>
<
s
>Lib. 1.
<
lb
/>
Prop. </
s
>
<
s
>4.</
s
>
</
p
>
<
p
type
="
margin
">
<
s
>
<
margin.target
id
="
marg1455
"/>
Id. </
s
>
<
s
>Lib. </
s
>
<
s
>1:
<
lb
/>
Prop. </
s
>
<
s
>3.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>Theſe things explained and proved, I come to conſider that which
<
lb
/>
offers it ſelf, touching what the Diverſity of figure given unto the
<
lb
/>
ſaid Moveable hath to do with theſe Motions and Reſts; and
<
lb
/>
ceed to affirme, that,</
s
>
</
p
>
<
p
type
="
head
">
<
s
>THEOREME V.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>
<
emph
type
="
italics
"/>
The diverſity of Figures given to this or that Solid
<
emph.end
type
="
italics
"/>
</
s
>
</
p
>
<
p
type
="
main
">
<
s
>
<
arrow.to.target
n
="
marg1456
"/>
<
lb
/>
<
emph
type
="
italics
"/>
cannot any way be a Cauſe of its abſolute Sinking
<
lb
/>
Swimming.
<
emph.end
type
="
italics
"/>
</
s
>
</
p
>
<
p
type
="
margin
">
<
s
>
<
margin.target
id
="
marg1456
"/>
Diverſity of
<
lb
/>
Figure no Cauſe
<
lb
/>
of its abſolute
<
lb
/>
Natation or
<
lb
/>
merſion.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>So that if a Solid being formed, for example, into a Spherical
<
lb
/>
Figure, doth ſink or ſwim in the water, I ſay, that being formed
<
lb
/>
into any other Figure, the ſame figure in the ſame water,
<
lb
/>
ſink or ſwim: nor can ſuch its Motion by the Expanſion or by
<
lb
/>
ther mutation of Figure, be impeded or taken
<
lb
/>
<
arrow.to.target
n
="
marg1457
"/>
</
s
>
</
p
>
<
p
type
="
margin
">
<
s
>
<
margin.target
id
="
marg1457
"/>
The
<
lb
/>
on of
<
emph
type
="
italics
"/>
F
<
emph.end
type
="
italics
"/>
igure,
<
lb
/>
tards the
<
lb
/>
ty of the aſcent
<
lb
/>
or deſcent of the
<
lb
/>
Moveable in the
<
lb
/>
water; but doth
<
lb
/>
not deprive it of
<
lb
/>
all Motion.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>The Expanſion of the Figure may indeed retard its Velocity,
<
lb
/>
well of aſcent as deſcent, and more and more according as the ſaid
<
lb
/>
gure is reduced to a greater breadth and thinneſs: but that it may bere
<
lb
/>
duced to ſuch a form as that that ſame matter be wholly hindred from
<
lb
/>
moving in the ſame water, that I hold to be impoſſible. </
s
>
<
s
>In this I have
<
lb
/>
met with great contradictors, who producing ſome Experiments, and
<
lb
/>
in perticular a thin Board of Ebony, and a Ball of the ſame Wood
<
lb
/>
and ſhewing how the Ball in Water deſcended to the bottom, and
<
lb
/>
the Board being put lightly upon the Water ſubmerged not, but
<
lb
/>
ed; have held, and with the Authority of
<
emph
type
="
italics
"/>
Ariſtotle,
<
emph.end
type
="
italics
"/>
confirmed them
<
lb
/>
ſelves in their Opinions, that the Cauſe of that Reſt was the
<
lb
/>
of the Figure, u able by its ſmall weight to pierce and penetrate the
<
lb
/>
Reſiſtance of the Waters Craſſitude, which Reſiſtance is readily
<
lb
/>
vercome by the other Sphericall Figure.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>This is the Principal point in the preſent Queſtion, in which I
<
lb
/>
ſwade my ſelf to be on the right ſide.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>Therefore, beginning to inveſtigate with the examination of
<
lb
/>
quiſite Experiments that really the Figure doth not a jot alter the
<
lb
/>
cent or Aſcent of the ſame Solids, and having already
<
lb
/>
ted that the greater or leſs Gravity of the Solid in relation to the
<
lb
/>
vity of the
<
emph
type
="
italics
"/>
Medium
<
emph.end
type
="
italics
"/>
is the cauſe of Deſcent or Aſcent: when ever we </
s
>
</
p
>
</
chap
>
</
body
>
</
text
>
</
archimedes
>