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

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1and, furthermore, not with every Matter, but with thoſe
wherewith
it may be able ro execute the deſired operation.

as
we ſee it verified by Experience, that the Acute and ſharp Angle
more
apt to cut, than the Obtuſe; yet alwaies provided, that
the
one and the other, be joyned with a Matter apt to cut, as
example
, with Steel.
Therefore, a Knife with a fine and
edge
, cuts Bread or Wood with much eaſe, which it will not do,
the
edge be blunt and thick: but he that will inſtead of Steel,
Wax
, and mould it into a Knife, undoubtedly ſhall never know
effects
of ſharp and blunt edges: becauſe neither of them will
the
Wax being unable by reaſon of its flexibility, to overcome
hardneſs
of the Wood and Bread.
And, therefore, applying
like
diſcourſe to our purpoſe, they ſay, that the difference of Figure
will
ſhew different effects, touching Natation and Submerſion,
not
conjoyned with any kind of Matter, but only with thoſe
which
, by their Gravity, are apt to reſiſt the Velocity of the
whence
he that would elect for the Matter, Cork or other light
unable
, through its Levity, to ſuperate the Craſſitude of the
and
of that Matter ſhould forme Solids of divers Figures, woulld
vain
ſeek to find out what operation Figure hath in Natation or
merſion
; becauſe all would ſwim, and that not through any property
of
this or that Figure, but through the debility of the Matter,
ing
ſo much Gravity, as is requiſite to ſuperate and overcome the
Denſity
and Craſſitude of the water.
An objection
gainſt
the
riment
in Wax.
An
ment
in Ebany,
brought
to
prove
the
timent
in Wax.

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