Valerio, Luca, De centro gravitatis solidorum, 1604

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1
PROPOSITIO XXXIIII.
Omnis portionis ſphæræ, vel ſphæroidis ab­
ſciſſæ duobusplanis parallelis, neutro per cen­
trum acto, nec centrum intercipientibus, centrum
grauitatis eſt in axe, primum bifariam ſecto: de­
inde ſecundum centrum grauitatis reliqui dem­
pta portione ex cylindro, vel portione cylindrica,
abſciſſo, vel abſciſſa vnà cum portione à cylin­
dro, vel portione cylindrica ſphæræ, vel ſphæroi­
di circa eius axem axi portionis congruentem cir­
cumſcripta; in eo puncto, in quo dimidius axis
portionis maiorem baſim attingens ſic diuiditur,
vt pars prima & ſecunda ſectione terminata ſit ad
eam, quæ prima, & poſtrema ſectione terminatur,
vt duo rectangula, alterum contentum duobus
ſphæræ, vel ſphæroidis axis axi portionis congruen
tis ijs ſegmentis, quæ fiunt à centro minoris baſis
portionis: alterum axe portionis, & ſegmento,
quod ſphæræ, vel ſphæroidis, & maioris baſis por­
tionis centra iungit, vnà cum duabus tertiis qua­
drati axis portionis, ad ſphæræ vel ſphæroidis di­
midij axis quadratum.
Sit ſphæræ, vel ſphæroidis, cuius centrum E portio
ABCD, abſciſſa duobus planis parallelis, neutro per E
tranſeunte, nec E intercipientibus: portionis autem axis
ſit FS: maior baſis circulus, vel ellipſis, cuius diame­

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