Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667

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1but one Point only. For let it be de­
294[Figure 294]
mitted
into the Liquid, as hath been
ſaid
; and let it firſt be ſo inclined, as
that
its Baſe do not in the leaſt
touch
the Surface of the Liquid.
And
then
it being cut thorow the Axis,
by
a Plane erect unto the Surface of
the
Liquid, let the Section of the
Portion
be A N Z G; that of the
Liquids
Surface E Z; the Axis of
the
Portion and Diameter of the
Section
B D; and let B D be cut in
the
Points K and R, as before; and
draw
N L parallel to E Z, and touching the Section A N Z G
in
N, and N S perpendicular to
295[Figure 295]
B
D. Now, ſeeing that the Por­
tion
is in Gravity unto the Liquid,
as
the Square made of the Line
is
to the Square B D; ψ ſhall
be
equall to N T: Which is to
be
demonſtrated as above: And,
therefore
, N T is alſo equall to
V
I: The Portions, therefore,
A
V Q and E N Z are equall to
one
another.
And, ſince that in
the
Equall and like Portions A V
Q
L and A N Z G, there are drawn A Q and E Z, cutting off
equall
Portions, that from the
296[Figure 296]
Extremity
of the Baſe, this not
from
the Extreme, that which is
drawn
from the Extremity of the
Baſe
, ſhall make the Acute Angle
with
the Diameter of the Portion
leſſer
: and in the Triangles N L S
and
V ω C, the Angle at L is
greater
than the Angle at ω:
Therefore
, B S ſhall be leſſer
than
B C; and S R leſſer than
C
R: and, conſequently, N X
greater
than V H; and X T leſſer than H I. Seeing, therefore,
that
V Y is double to Y I; It is manifeſt, that N X is greater than
double
to X T.
Let N M be double to M T: It is manifeſt, from what
hath
been ſaid, that the Portion ſhall not reſt, but will incline, untill
that
its Bafe do touch the Surface of the Liquid: and it toucheth it in
one
Point only, as appeareth in the Figure: And other things

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