Archimedes
,
Natation of bodies
,
1662
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ſaid K
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in H, and A S is parallel unto the
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L
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ine that toucheth in
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P; It is neceſſary that P I hath unto P H either the ſame proportion
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that
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N
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hath to
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O, or greater; for this hath already been de
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monſtrated: But
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N
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is ſeſquialter of
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O; and P I, therefore, is
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either Seſquialter of H P, or more than ſeſquialter: Wherefore
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P H is to H I either double, or leſſe than double.
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L
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et P T be
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double to T I: the Centre of Gravity of the part which is within
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the
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L
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iquid ſhall be the Point T. </
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<
s
>Therefore draw a
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L
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ine from T
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to F prolonging it; and let the Centre of
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Gravity of the part which is above the
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L
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iquid
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be G: and from the Point B at Right Angles
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unto
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N O
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draw B R. </
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<
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>And ſeeing that P I is
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parallel unto the Diameter
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N O,
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and B R
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perpendicular unto the ſaid Diameter, and F
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B equall to the Semi-parameter; It is mani
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feſt that the
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L
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ine drawn thorow the Points
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F and R being prolonged, maketh equall
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Angles with that which toucheth the Section
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A P O L in the Point P: and therefore doth alſo make Right An
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gles with A S, and with the Surface of the
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L
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iquid: and the
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L
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ines
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drawn thorow T and G parallel unto F R ſhall be alſo perpendicu
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lar to the Surface of the
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L
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iquid: and of the Solid Magnitude A P
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O L, the part which is within the
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L
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iquid moveth upwards according
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to the Perpendicular drawn thorow T; and the part which is above
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the
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L
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iquid moveth downwards according to that drawn thorow G:
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The Solid A
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P
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O L, therefore, ſhall turn about, and its Baſe ſhall
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not in the leaſt touch the Surface of the
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L
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iquid, And if
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P
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I do not
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cut the
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L
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ine K
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as in the ſecond Figure, it is manifeſt that the
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P
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oint T, which is the Centre of Gravity of the ſubmerged
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P
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ortion,
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falleth betwixt
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P
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and I: And for the other particulars remaining,
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they are demonſtrated like as before.</
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A</
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B</
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C</
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D</
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E</
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<
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>COMMANDINE.
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A</
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<
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>It is to be demonſtrated that the ſaid
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P
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ortion ſhall not continue
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ſo, but ſhall turn about in ſuch manner as that its Baſe do in no wiſe
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touch the Surface of the Liquid.]
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Theſe words are added by us, as having been
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omitted by
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Tartaglia.</
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N
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ow becauſe N O hath greater proportion to F
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than unto </
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the Semi parameter.]
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For the Diameter of the Portion N O hath unto F
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the
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ſame proportion as fifteen to fower: But it was ſuppoſed to have leſſe proportion unto the
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Semi-parameter than fifteen to fower: Wherefore N O hath greater proportion unto F
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<
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<
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than unto the Semi-parameter: And therefore
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(a)
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the Semi-parameter ſhall be greater
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<
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than the ſaid F
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<
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B</
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(a)
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By 10. of the
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fifth.
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</
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<
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>Foraſmuch, therefore, as in the
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P
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ortion
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A P O L,
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contained, be
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twixt the Right
<
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L
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ine and the Section of the Rightangled Cone K
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<
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>
is parallel to A L, and
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P I
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parallel unto the Diameter, and cut by </
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