Valerio, Luca
,
De centro gravitatis solidorvm libri tres
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ad O potentia, vt DB ad BF longitudine: ſed TD eſt
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æqualis N; ergo & IF æqualis erit O: cum igitur &
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P ipſius O, &
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F ipſius FI ſit potentia ſeſquialtera, erit
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F
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æqualis ipſi
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: ſed F<37> eſt æqualis ipſi
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vt igitur eſt
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Q ad P, hoc eſt DB ad BF, ita erit <37>F ad F
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; dupli
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cata igitur proportio erit quadrati ex F<37> ad quadratum ex
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E
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eius, quæ eſt DB ad BF: ſed vt quadratum ex F<37> ad
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quadratum ex F
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, ita eſt circulus circa <37>
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ad circulum
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circa
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, hoc eſt conus <37>B
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ad conum
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B
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; coni igitur
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<37>B
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ad conum
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B
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, duplicata eſt proportio eius, quæ eſt
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DB ad BF: ſed & conoidis TBX ad conoides IB
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du
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plicata eſt proportio eius, quæ eſt DB ad BF, vt mon
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ſtrant alij; eadem igitur proportio eſt coni <37>B
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ad co
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num
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B
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quæ conoidis TBX ad conoides IB
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: ſed </
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