Valerio, Luca, De centro gravitatis solidorum, 1604

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1baſes ſunt circuli, vel ellipſes, reliqua autem ſu­
perficies tota interius concaua, centrum grauitatis
eſt in dimidio axis ſegmento, quod baſim, vel ma­
iorem baſim attingit.
Sit figura circa axim in alteram partem deficiens ABC,
cuius axis BD, baſis, vel maior baſis circulus, vel ellipſis
circa diametrum AC, reliqua autem ſuperficies tota inte­
rius concaua: ſecto autem axe BD bifariam in puncto G,
ſit ſolidi ABC centrum grauitatis F nempe in axe BD.
Dico punctum F eſſe in ſegmento ED. Secto enim ſoli­
do ABC, & figu
ra per axem pla
no per punctum E
baſi, vel baſibus
parallelo, fiat ſe­
ctio circulus, vel
ellipſis ſimilis
baſi, per diffini­
tionem, & ſectio­
nis diameter K
N: deinde figu­
ra quædam ex
167[Figure 167]
duobus cylindris, vel cylindri portionibus KL, AM cir­
ca axes BE, ED, eiuſdem altitudinis circumſcribatur
ſolido ABC: ſecanturque bifariam BE in puncto G, &
ED in puncto H. totius autem figuræ circumſcriptæ ſit
centrum grauitatis O, nempe in axe BD.
Quoniam igi­
tur propter bipartitorum axium ſectiones G, H, eſt ſolidi
KL centrum grauitatis G: ſolidi autem AM centrum
grauitatis H, erit in linea GH totius ſolidi AL centrum
grauitatis O, & vt ſolidum AM ad ſolidum KL, ita GO
ad OH: ſed maior eſt proportio ſolidi AM ad ſolidum KL

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