Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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>PROP. IX. THE OR. IX.</
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The Right Portion of a Rightangled Conoid, when it
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ſhall have its Axis greater than Seſquialter of the
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Semi-parameter, but leſſer than to be unto the ſaid
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Semi-parameter in proportion as fifteen to four, and
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hath greater proportion in Gravity to the Liquid, than
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the exceſs by which the Square made of the Axis is
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greater than the Square made of the Exceſs, by which
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the Axis is greater than Seſquialter of the Semi
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parameter, hath to the Square made of the Axis,
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being demitted into the Liquid, ſo as that its Baſe
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be wholly within the Liquid, and being ſet inclining
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it ſhall neither turn about, ſo as that its Axis ſtand
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according to the Perpendicular, nor remain inclined,
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ſave only when the Axis makes an Angle with
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the Surface of the Liquid, equall to that aßigned
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as before.
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>Let there be a Portion as was ſaid; and ſuppoſe D B equall to
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the Axis of the
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ortion: and let B K be double to K D; and
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K R equall to the Semi-parameter: and C B Seſquialter of
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B R. </
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>And as the Portion is to the Liquid in Gravity, ſo let the Ex
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ceſſe by which the Square B D exceeds the Square F Q be to the
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Square B D: and let F be double to Q: It is manifeſt, therefore,
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that the Exceſſe by which the
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Square B D is greater than the
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Square B C hath leſser proportion
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to the Square B D, than the Exceſs
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by which the Square B D is greater
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than the Square F Q hath to the
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Square B D; for B C is the Exceſs
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by which the Axis of the Portion is
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greater than Seſquialter of the
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Semi-parameter: And, therefore, </
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the Square B D doth more exceed
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the Square F Q, than doth the
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Square B C: And, conſequently, the Line F Q is leſs than B C; </
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