1nue, but will return to be according to the
240[Figure 240]
Perpendieular. It is manifeſt that the Gen
tre of the Sphære is in the Line F T. And
again, foraſmuch as the Portion of a Sphære
may be greater or leſſer than an Hemiſ
phære, and may alſo be an Hemiſphære, let
the Centre of the Sphære in the Hemiſ
phære be the Point T, & in the leſſer Por
tion the Point P, and in the Greater the
240[Figure 240]Perpendieular. It is manifeſt that the Gen
tre of the Sphære is in the Line F T. And
again, foraſmuch as the Portion of a Sphære
may be greater or leſſer than an Hemiſ
phære, and may alſo be an Hemiſphære, let
the Centre of the Sphære in the Hemiſ
phære be the Point T, & in the leſſer Por
tion the Point P, and in the Greater the
Point R. And ſpeaking firſt of that greater
Portion which hath its Baſe within the
Liquid, thorow R and L, the Earths Cen
241[Figure 241]tre, draw the line RL. The Portion that is
above the Liquid, hath its Axis in the Per
pendicular paſſing thorow R; and by
what hath been ſaid before, its Centre of
Gravity ſhall be in the Line N R; let it
be the Point R: But the Centre of Gra
vity of the whole Portion is in the line F
T, betwixt R and F; let it be X: The re
mainder therefore of that Figure, which is
within the Liquid ſhall have its Centre in
the Right Line R X prolonged in the part
242[Figure 242]towards X, taken ſo, that the part pro
longed may have the ſame Proportion to
X R, that the Gravity of the Portion that
is above the Liquid hath to the Gravity
of the Figure that is within the Liquid.
Let O be the Centre of that ſame Figure:
and thorow O draw the Perpendicular L
O. Now the Gravity of the Portion that
is above the Liquid ſhall preſs according
to the Right Line R L downwards; and
the Gravity of the Figure that is in the
Liquid according to the Right Line O L upwards: There the Figure
ſhall not continue; but the parts of it towards H ſhall move down
wards, and thoſe towards E upwards: &
243[Figure 243]this ſhall ever be, ſo long as F T is accord
ing to the Perpendicular.
A
COMMANDINE.
The Portion that is above the Liquid
hath its Axis in the Perpendicular paſſing
thorow K.] For draw B C cutting the Line N K in
M; and let N K out the Circumference A B C D in G. In
the ſame manner as before me will demonſtrate, that the Axis
hath its Axis in the Perpendicular paſſing
thorow K.] For draw B C cutting the Line N K in
M; and let N K out the Circumference A B C D in G. In
the ſame manner as before me will demonſtrate, that the Axis
zoom in
zoom out
zoom area
full page
page width
set mark
remove mark
get reference
digilib