Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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the proportion of the whole Portion unto that part thereof which is above the Liquid ſhall not be
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greater than that of the Square N O unto the Square M O: Which was to be demonſtrated.
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>And hence it followeth that P F is not leſſe than O M, nor P B </
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than O H.]
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This followeth by the 10 and 14 of the fifth, and by the 22 of the ſixth of
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Euclid,
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as hath been ſaid above.
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B</
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>A
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L
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ine, therefore, drawn from Hat Right Angles unto N O ſhall
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meet with P B betwixt P and B.]
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Why this ſo falleth out, we will ſhew in the
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next.
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C</
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>PROP. VI. THEOR. VI.</
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The Right Portion of a Rightangled Conoid lighter
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than the Liquid, when it ſhall have its Axis greater
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than ſeſquialter of the Semi-parameter, but leſſe than
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to be unto the Semi-parameter in proportion as fifteen
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to fower, being demitted into the Liquid ſo as that
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its Baſe do touch the Liquid, it ſhall never stand ſo
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enclined as that its Baſe toucheth the Liquid in one
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Point only.
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>Let there be a Portion, as was ſaid; and demit it into the Li
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quid in ſuch faſhion as that its Baſe do touch the Liquid in
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one only Point: It is to be demonſtrated that the ſaid Portion
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ſhall not continue ſo, but ſhall turn about in ſuch manner as that
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its Baſe do in no wiſe touch the Surface of the Liquid. </
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>For let it be
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cut thorow its Axis by a Plane erect
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upon the
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L
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iquids Surface: and let
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the Section of the Superficies of the
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Portion be A P O L, the Section of
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a Rightangled Cone; and the Sect
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ion of the Surface of the
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L
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iquid be
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A S; and the Axis of the Portion
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and Diameter of the Section N O:
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and let it be cut in F, ſo as that O
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F be double to F N; and in
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ſo, as that N O may be to F
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in the
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ſame proportion as fifteen to four; and at Right Angles to N O
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draw
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N
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ow becauſe N O hath greater proportion unto F
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than
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unto the Semi-parameter, let the Semi-parameter be equall to F B:
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and draw P C parallel unto A S, and touching the Section A P O L
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in P; and P I parallel unto
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N O
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; and firſt let P I cut K
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in H. For
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aſmuch, therefore, as in the Portion A P O L, contained betwixt
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the Right
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L
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ine and the Section of the Rightangled Cone, K
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is
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parallel to A L, and P I parallel unto the Diameter, and cut by the </
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