Valerio, Luca, De centro gravitatis solidorum, 1604

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1Dico ſphæræ, vel ſphæroidis ABCD, centrum grauitatis
eſse E.
Sint enim bini axes ſphæræ, vel ſphæroidis inter
ſe ad rectos angulos; & in ſphæroide ſit maior diameter
BD, minor AC, per binos autem hos axes plana tran­
ſeuntia ad eos axes erecta, ſecent ſphæram, vel ſphæroidem.
Qua ratione axes dimidij erunt axes hemiſphærij, vel he­
miſphæroidis: hemiſphærium autem, & ſphæroidis eſt fi­
58[Figure 58]
gura circa axim in alteram partem deficiens, qualium om­
nium figurarum centrum grauitatis eſt in axe; igitur hemi­
ſphærij, vel hemiſphæroidis ABCD, centrum grauitatis
eſt in axi BE, ſicut & reliqui ADA, in axi ED; totius
igitur ſphæræ, vel ſphæroidis ABCD centrum grauitatis
eſt in axi BD.
Eadem ratione & in axi AC; in communi
igitur ſectione centro E.
Quod demonſtrandum erat.
PRIMI LIBRI FINIS.
59[Figure 59]

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