Valerio, Luca, De centro gravitatis solidorum, 1604

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1
PROPOSITIO XXXVI.
Omnis portionis ſphæræ abſciſſæ duobus pla­
nis parallelis neutro per centrum acto, nec cen­
trum intercipientibus, centrum grauitatis eſt in
axe primum bifariam ſecto: deinde ſecundum
centrum grauitatis fruſti circa eundem axim,
abſciſſi à cono verticem habente centrum ſphæ­
ræ; in eo puncto in quo dimidius axis maiorem
baſim attingens ſic diuiditur, vt pars duabus præ­
dictis ſectionibus finita ſit ad eam, quæ inter ſe­
cundam, & vltimam ſectionem interijcitur, vt
exceſſus, quo maior extrema ad triplas & ſemidia
metri ſphæræ, & eius quæ inter centra ſphæræ,
& minorem baſim portionis interijcitur, ſuperat
tres deinceps proportionales, quarum maxima
eſt, quæ inter centra ſphæræ, & minoris baſis,
media autem, quæ inter centra ſphæræ, & maio­
ris baſis portionis interijcitur; ad maiorem extre­
mam antedictam.
Sit portio ABCD, ſphæræ, cuius centrum E, ab­
ſciſsa duobus planis parallelis, neutro per E tranſeun­
te, nec E intercipientibus: axis autem portionis ſit GH,
maior baſis circulus, cuius diameter AD, minor cuius
diameter BC: producta autem GH vſque in E intel­
ligatur coni KEN rectanguli, cuius axis EG, fruſtum

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