Galilei, Galileo, Mechanics, 1665

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We laſtly ſuppoſe the Center of the Gravity of two Bodies
qually
Grave to be in the midſt of that Right Line which conjoyns
the
ſaid two Centers; or that two equall weights, ſuſpended in
equall
diſtence, ſhall have the point of Equilibrium in the common
Center
, or meeting of thoſe equal Diſtances.
As for Example,
the
Diſtance C E being equall to the Diſtance E D, and there be­
ing
by them two equall weights ſuſpended, A and B, we ſuppoſe
the
point of Equilibrium to be in the point E, there being no
greater
reaſon for inclining to
one
, then to the other part.
But
1[Figure 1]
here
is to be noted, that the Di­
ſtances
ought to be meaſured
with
Perpendicular Lines, which
from
the point of Suſpenſion E,
fall
on the Right Lines, that from
the
Center of the Gravity of the
Weights
A and B, are drawn to
the
common Center of things
Grave
; and therefore if the Diſtance E D were tranſported into
E
F, the weight B would not counterpoiſe the weight A, becauſe
drawing
from the Centers of Gravity two Right Lines to the Cen­
ter
of the Earth, we ſhall ſee that which cometh from the Center
of
the Weight I, to be nearer to the Center E, then the other
produced
from the Center of the weight A.
Therefore our ſaying
that
equal Weights are ſuſpended by [or at] equal Diſtances, is
to
be underſtood to be meant when as the Right Lines that go from
their
Centers & to ſeek out the common Center of Gravity, ſhall be
equidiſta
nt from that Right Line, which is produced from the ſaid

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