Archimedes
,
Natation of bodies
,
1662
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Again, by dividing, I D ſhall be to D Z, as one to two: But Z D was to D A, that is, to D L,
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as two to five: Therefore,
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ex equali,
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and Converting, L D is to D I, as five to one: and, by
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Converſion of Proportion, D L is to D I, as five to four: But D Z was to D L, as two to
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five: Therefore, again,
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ex equali,
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D Z is to L I, as two to four: Therefort L I is double
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of D Z: Which was to be demonſtrated.
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>And, A D is to D I, as five to one.]
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This we have but juſt now demon
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ſtrated.
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>For it hath been demonſtrated, above, that the Portion whoſe
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Axis is greater than Seſquialter of the Semi-parameter, if it have
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not leſſer proportion in Gravity to the Liquid, &c.]
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He hath demonstra
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ted this in the fourth Propoſition of this Book.
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>CONCLVSION II.</
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If the Portion have leſſer proportion in Gravity to the
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Liquid, than the Square S B hath to the Square
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B D, but greater than the Square X O hath to the
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Square B D, being demitted into the Liquid, ſo in
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clined, as that its Baſe touch not the Liquid, it ſhall
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continue inclined, ſo, as that its Baſe ſhall not in the
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leaſt touch the Surface of the Liquid, and its Axis
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ſhall make an Angle with the Liquids Surface, greater
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than the Angle X.
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>Therfore repeating the firſt figure, let the Portion have unto
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the Liquid in Gravitie a proportion greater than the Square
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X O hath to the ſquare B D, but leſſer than the Square made of
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the Exceſſe by which the Axis is greater than Seſquialter of the Semi
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Parameter, that is, of S B, hath to
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the Square B D: and as the Portion
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is to the Liquid in Gravity, ſo let
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the Square made of the Line
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be
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to the Square B D:
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ſhall be great
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er than X O, but leſſer than the
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Exceſſe by which the Axis is grea
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ter than Seſquialter of the Semi
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parameter, that is, than S B. </
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>Let
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a Right Line M N be applyed to
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fall between the Conick-Sections
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A M Q L and A
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X
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D, [
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parallel to
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B D falling betwixt O X and B D,
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] and equall to the Line
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: and let
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it cut the remaining Conick Section A H I in the point H, and the
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Right Line R G in V. </
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>It ſhall be demonſtrated that M H is double to
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H N, like as it was demonſtrated that O G is double to G X. </
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