Valerio, Luca, De centro gravitatis solidorvm libri tres

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1poſitorum ex binis ſectionibus nempe circulis, quorum al­
ter ad conum KBL pertinet, alter ad conoides MBN, in
eodem plano ſecante prædictorum inter ſe parallelorum
exiſtentibus, minorem eſſe proportionem incipienti ab eo,
quod eſt proximum vertici, primi ad ſecundum, quàm ſe­
cundi ad tertium, & ſecundi ad tertium, quàm tertij ad
quartum, & ſic ſemper deinceps vſque ad maximum & vl­
timum compoſitum ex circulis MN, KL: & eandem di­
ctas ſectiones compoſitas ex coni, & conoidis parabolici
ſectionibus inter ſe habere proportionem, quàm habent in­
ter ſe circuli ſectiones conoidis ABC, pro vt illis in
ijſdem planis ſecantibus, & æqualia axis BD ſegmenta
intercipientibus reſpondent: Igitur per trigeſimam ſecun­
dam huius, & ſequens eam Corollarium, conoides ABC,
& compoſitum ex conoide MBN, & cono BKL, com­
mune habebunt in axe BD centrum grauitatis.
Sed H
erat huius compoſiti centrum grauitatis; Igitur conoidis
ABC centrum grauitatis erit idem H.
Quod demon­
ſtrandum erat.
COROLLARIV M.
Eadem demonſtratione conſtat ſi prædicta tria
ſolida ita vt diximus diſpoſita ſecentur plano ba­
ſibus parallelo; ſruſtum conoidis hyperbolici, &
compoſitum ex fruſtis coni, & conoidis paraboli­
ci, commune habere in communi axe centrum
grauitatis.

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