Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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Therefore, the abſolute weight of B, to the abſolute weight of C, is
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as the Maſs A C to the Maſs
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C
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: But as the Maſs AC, is to the Maſs C,
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ſo is the abſolute weight of A C, to the abſolute weight of C:
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fore the abſolute weight of B, hath the ſame proportion to the
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lute weight of C, that the abſolute weight of A C, hath to the
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ſolute weight of C: Therefore, the two Solids A C and B are equall
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in abſolute Gravity: which was to be demonſtrated. </
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<
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>Having
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monſtrated this, I ſay,</
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>THEOREME X.</
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That it is poſſible of any aſſigned Matter, to form a Pi-
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ramide or Cone upon any Baſe, which being put upon
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the Water ſhall not ſubmerge, nor wet any more than
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its Baſe.
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There may be
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Cones and
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mides of any
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M
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atter, which
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demittedinto the
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water, reſt only
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their Baſes.</
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>Let the greateſt poſſible Altitude of the Rampart be the Line D B,
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and the Diameter of the Baſe of the Cone to be made of any
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ter aſſigned B C, at right angles to D B: And as the Specificall Gravity
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of the Matter of the Piramide or Cone to be made, is to the Specificall
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Gravity of the water, ſo let the Altitude of the
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Rampart D B, be to the third part of the Piramide
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or Cone A B C, deſcribed upon the Baſe, whoſe
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Diameter is B C: I ſay, that the ſaid Cone A B C,
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and any other Cone, lower then the ſame, ſhall reſt
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upon the Surface of the water B C without ſinking.
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>Draw D F parallel to B C, and ſuppoſe the Priſme
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or Cylinder E C, which ſhall be tripple to the Cone
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A B C. And, becauſe the Cylinder D C hath the ſame proportion
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to the Cylinder C E, that the Altitude D B, hath to the Altitude B E:
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But the Cylinder C E, is to the Cone A B C, as the Altitude E B is to
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the third part of the Altitude of the Cone: Therefore, by Equality of
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proportion, the Cylinder D C is to the Cone A B C, as D B is to the
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third part of the Altitude B E: But as D B is to the third part of B E,
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ſo is the Specificall Gravity of the Cone A B C, to the Specificall
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vity of the water: Therefore, as the Maſs of the Solid D C, is to the
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Maſs of the Cone A
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B
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C, ſo is the Specificall Gravity of the ſaid Cone,
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to the Specificall Gravity of the water: Therefore, by the precedent
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Lemma, the Cone A B C weighs in abſolute Gravity as much as a
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Maſs of Water equall to the Maſs D C: But the water which by the
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impoſition of the Cone A B C, is driven out of its place, is as much
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as would preciſely lie in the place D C, and is equall in weight to the
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Cone that diſplaceth it: Therefore, there ſhall be an
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Equilibrium,
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and the Cone ſhall reſt without farther ſubmerging. </
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<
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>And its
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nifeſt,</
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