Valerio, Luca, De centro gravitatis solidorum, 1604

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1KLMN abſciſſum ijſdem planis, quibus por­
tio, & ſphæræ ſemidiameter ſit EHGS: & po­
ſita T tripla ipſius ES, & V ipſius EG tri­
pla, eſto vt V ad T ita T ad XZ: & vt GE
ad EH ita EH ad ω, & ſit ZY, ipſius XZ,
æqualis tribus GE, EH, ω, vt ſit exceſſus
XY: & ſecto axe GH bifariam in puncto I, in
linea GI, ſumatur O, centrum grauitatis fru­
ſti KLMN: Et vt ΥX ad XZ, ita fiat IO
ad OIP.
Dico portionis ABCD centrum
grauitatis eſſe P.
Nam circa axim GH pla­
nis baſium portionis interceptus ſtet cylin­
drus QR, cuius baſis ſit æqualis circulo ma­
ximo.
Quoniam igitur eſt vt YX ad XZ,
hoc eſt vt IO ad OP, ita portio ABCD
ad cylindrum QR, & diuidendo vt OI ad
IP, ita portio ABCD ad reliquum cylindri
QR: & I eſt cylindri QR, & O prædicti
reſidui centrum grauitatis; erit reliquæ por­
115[Figure 115]
tionis ABCD centrum grauitatis P.
Quod demon­
ſtrandum erat.

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