Commandino, Federico, Liber de centro gravitatis solidorum, 1565

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111[Figure 11]
habebit maiorem proportionem,
quam cb ad ba.
fiat ob ad ba,
ut figura rectilinea ad portio­
nes.
cum igitur à circulo, uel el­
lipſi, cuius grauitatis centrum
eſt b, auferatur figura rectilinea
efghklmn, cuius centrum a;
reliquæ magnitudinis ex portio

nibus compoſitæ centrum graui
tatis erit in linea ab producta,
& in puncto o, extra figuram po
ſito.
quod quidem fieri nullo mo
do poſſe perſpicuum eſt.
ſequi­
tur ergo, ut circuli & ellipſis cen
trum grauitatis ſit punctum a,
idem quod figuræ centrum.
8. quinti
19. quinti
apud Cam
panum
.
8. Archi­
medis.
ALITER.
Sit circulus, uel ellipſis abcd,
cuius diameter db, & centrum e: ducaturque per e recta li
nea ac, ſecans ipſam db ad rectos angulos.
erunt adc,
abc circuli, uel ellipſis dimidiæ portiones.
Itaque quo­
12[Figure 12]
niam por
tionis adc
centrum gra­
uitatis eſt
in diame­
tro de: &
portionis
abc cen­
trum eſt im
ipſa eb: to
tius circu
li, uel ellipſis grauitatis centrum erit in diametro db.

Sit autem portionis adc centrum grauitatis f: & ſumatur

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