Valerio, Luca, De centro gravitatis solidorvm libri tres

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1aliam trium harum figurarum pertinentes. Quod ſi præ­
terea factæ ſectiones hemiſphærij ABC à cylindri AF
ſectionibus, circuli à circulis concentricis auferri intelli­
gantur; reliquæ totidem erunt ſectiones reliquæ figuræ ſo­
lidæ, dempto ABC hemiſphærio ex toto AF cylin­
dro, circuli deficientes circulis concentricis, hoc eſt prædi­
ctis ABC hemiſphærij ſectionibus prout inter ſe reſpon­
dent.
Nunc ſuper ſectiones hemiſphærij ABC, & co­
ni EDF cylindris conſtitutis circa axes, quæ ſunt ſeg­
menta æqualia axis BD, intelligantur duæ figuræ ex cy­
lindris æqualium altitudinum, altera inſcripta hemiſphæ­
111[Figure 111]
rio ABC, altera cono EDF circumſcripta.
Si igitur
à toto AF cylindro auferatur figura, quæ inſcripta eſt
hemiſphærio ABC, relinquetur figura quædam ex cylin­
dris circa prædictos axes, vt ſunt BK, KH, HL, LD,
deficientibus ijs cylindris, ex quibus conſtat figura inſcri­
pta hemiſphærio ABC, & vno integro ſupiemo XF
cylindro, circumſcripta reſiduo AF cylindri dempto A
BC hemiſphærio, circumſcriptione interna: talis autem
figuræ circumſcriptæ centrum grauitatis, per ea, quæ in
primo libro, erit in axe BD, quemadmodum & aliarum
duarum figurarum ex cylindris, quarum altera inſcripta
eſt hemiſphærio ABC, altera cono EDF circumſcripta.

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