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

Page concordance

< >
Scan Original
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
< >
page |< < of 77 > >|
1
It is now to be noted, that the Board of Ebany and the Ball, put

into the water, both ſink, but the Ball more ſwiftly, and the Board
more
ſlowly; and ſlower and ſlower, according as it ſhall be more
broad
and thin, and of this Tardity the breadth of the Figure is the
true
Cauſe: But theſe broad Boards that ſlowly deſcend, are the
ſame
, that being put lightly upon the water, do ſwimm: Therefore,
if
that were true which the Adverſaries affirm, the ſame numerical
Figure
, would in the ſame numericall water, cauſe one while Reſt, and
another
while Tardity of Motion, which is impoſſible: for every

ticular
Figure which deſcends to the Bottom, hath of neceſſity its own
determinate
Tardity and ſlowneſs, proper and naturall unto it,
ding
to which it moveth, ſo that every other Tardity, greater or leſſer
is
improper to its nature: if, therefore, a Board, as ſuppoſe of a foot
ſquare
, deſcendeth naturally with ſix degrees of Tardity, it is
ble
, that it ſhould deſcend with ten or twenty, unleſs ſome new
diment
do arreſt it.
Much leſs can it, by reaſon of the ſame Figure
reſt
, and wholly ceaſe to move; but it is neceſſary, that when ever it
reſteth
, there do ſome greater impediment intervene than the breadth
of
the Figure.
Therefore, it muſt be ſomewhat elſe, and not the
gure
, that ſtayeth the Board of Ebany above water, of which Eigure
the
only Effect is the retardment of the Motion, according to which
it
deſcendeth more ſlowly than the Ball.
Let it be confeſſed,
fore
, rationally diſcourſing, that the true and ſole Cauſe of the Ebanys
going
to the Bottom, is the exceſs of its Gravity above the Gravity of
the
water: and the Cauſe of the greater or leſs Tardity, the breadth
of
this Figure, or the contractedneſs of that: but of its Reſt, it can
by
no means be allowed, that the quallity of the Figure, is the Cauſe
thereof
: aſwell, becauſe, making the Tardity greater, according as
the
Figure more dilateth, there cannot be ſo immenſe a Dilatation, to
which
there may not be found a correſpondent immence Tardity.
without reduſing it to Nullity of Motion; as, becauſe the Figures
produced
by the Antagoniſts for effecters of Reſt, are the ſelf ſame
that
do alſo go to the
The
on
of the
riment
in the
Ebany
.
Every perticular
Figure
hath its
own
peculiat
Tardity
.

Text layer

  • Dictionary
  • Places

Text normalization

  • Original
  • Regularized
  • Normalized

Search


  • Exact
  • All forms
  • Fulltext index
  • Morphological index