Galilei, Galileo, Discourse concerning the natation of bodies, 1663

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1In lib: 1. of
tation
of Bodies
Prop
.
7.
Figure operates
not
in the
tion
of Sollids.
It was anſwered me, that that proceeded not from the greater Levity;

but
from the Figure, large and flat, which not being able to
trate
the Reſiſtance of the Water, is the cauſe that it ſubmergeth not.
I replied, that any piece of Ice, of whatſoever Figure, ſwims upon
the
Water, a manifeſt ſigne, that its being never ſo flat and broad,
hath
not any part in its floating: and added, that it was a manifeſt
proofe
hereof to ſee a piece of Ice of very broad Figure being thruſt
to
the botome of the Water, ſuddenly return to flote atoppe, which
had
it been more grave, and had its ſwimming proceeded from its
Forme
, unable to penetrate the Reſiſtance of the Medium, that
would
be altogether impoſſible; I concluded therefore, that the Figure
was
in ſort a Cauſe of the Natation or Submerſion of Bodies,
but
the greater or leſſe Gravity in reſpect of the Water: and
fore
all Bodyes heavier than it of what Figure ſoever they be,
rently
go to the bottome, and the lighter, though of any figure, float
indifferently
on the top: and I ſuppoſe that thoſe which hold
wiſe
, were induced to that beliefe, by ſeeing how that diverſity
of
Formes or Figures, greatly altereth the Veloſity, and Tardity
of
Motion; ſo that Bodies of Figure broad and thin, deſcend
far
more leaſurely into the Water, than thoſe of a more compacted
Figure
, though both made of the ſame Matter: by which ſome
might
be induced to believe that the Dilatation of the Figure might
reduce
it to ſuch ampleneſſe that it ſhould not only retard but wholly
impede
and take away the Motion, which I hold to be falſe.
Upon
this
Concluſion, in many dayes diſcourſe, was ſpoken much, and
many
things, and divers Experiments produced, of which your
Highneſſe
heard, and ſaw ſome, and in this diſcourſe ſhall have
all
that which hath been produced againſt my Aſſertion, and what
hath
been ſuggeſted to my thoughts on this matter, and for
firmation
of my Concluſion: which if it ſhall ſuffice to remove that
(as I eſteem hitherto falſe) Opinion, I ſhall thinke I have not
unprofitably
ſpent my paynes and time.
and although that come
not
to paſſe, yet ought I to promiſe another benefit to my ſelfe,
namely
, of attaining the knowledge of the truth, by hearing my
Fallacyes
confuted, and true demonſtrations produced by thoſe
of
the contrary opinion.

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