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

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page |< < of 77 > >|
Nay, I will ſay more, that if we ſhall conſider Gold in compariſon

of
water, we ſhall find, that it exceeds it in Gravity almoſt twenty times,
ſo
that the Force and Impetus, wherewith a Ball of Gold goes to the
Bottom
, is very great.
On the contrary, there want not matters, as
Virgins
Wax, and ſome Woods, which are not above a fiftieth part leſs
grave
than water, whereupon their Aſcenſion therein is very ſlow, and
a
thouſand times weaker than the Impetus of the Golds deſcent: yet
notwithſtanding
, a plate of Gold ſwims without deſcending to the
Bottom
, and, on the contrary, we cannot make a Cake of Wax, or thin
Board
of Wood, which put in the Bottom of the Water, ſhall reſt there
without
aſcending.
Now if the Figure can obſtruct the Penetration,
and
impede the deſcent of Gold, that hath ſo great an Impetus, how
can
it chooſe but ſuffice to reſiſt the ſame Penetration of the other
ter
in aſcending, when as it hath ſcarce a thouſandth part of the Impetus
that
the Gold hath in deſcending?
Its therefore, neceſſary, that that
which
ſuſpends the thin Plate of Gold, or Board of Ebony, upon the
water
, be ſome thing that is wanting to the other Cakes and Boards of
Matters
leſs grave than the water; ſince that being put to the Bottom,
and
left at liberty, they riſe up to the Surface, without any obſtruction:
But
they want not for flatneſs and breadth of Figure: Therefore, the
ſpaciouſneſſe
of the Figure, is not that which makes the Gold and Ebony
to
ſwim.

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