Valerio, Luca
,
De centro gravitatis solidorum
,
1604
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ad OH, erit tertij exceſſus ex duobus prioribus compoſi
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ti centrum grauitatis O. </
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<
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tio eſt primi exceſſus ad ſedundum, hoc eſt MO ad OH,
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quàm LK ad KH; erit conuertendo maior proportio HO
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ad OM, quàm HK ad KL: ſed vt HK ad KL, ita
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ponitur HN ad NM; maior igitur proportio eſt HO ad
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OM, quàm HN ad NM; eiuſdem igitur lineæ HM
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minor erit MO, quàm MN, & punctum O propinquius
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puncto G quam punctum N. </
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>Rurſus quia vt HK ad
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KL, ita eſt HN ad NM; erit componen do & per con
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uerſionem rationis, vt LH ad HK ita MH ad HN: &
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permutando, vt HM ad HL, ita HN ad HK: ſed HM
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eſt maior quàm HL; ergo & HN erit maior quam H
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K
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,
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& punctum N propinquius puncto G quàm punctum K:
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ſed punctum O propinquius erat puncto G quàm punctum
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N; multo igitur erit punctum O propinquius puncto G
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quàm punctum K. ponitur autem diſtantia GK minor
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quantacumque longitudine propoſita: & eſt O centrum
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grauitatis tertij exceſſus reliquo ſolido AEBFC circum
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ſcripti; ex ijs igitur, quæ in primo libro demonſtrauimus,
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ſolidi AEBFC centrum grauitatis erit G. </
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<
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ſtrandum erat. </
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PROPOSITIO VII.
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>Omnis conoidis hyperbolici centrum grauita
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tis eſt punctum illud, in quo duodecima pars axis
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quarta ab ea, quæ baſim attingit ſic diuiditur, vt
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pars propinquior baſi ſit ad reliquam, vt ſeſquial
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tera tranſuerſi lateris hyperboles, quæ conoides
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deſcribit; ad axem conoidis. </
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>Sit conoides hyperbolicum ABC, cuius axis BD: </
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