Commandino, Federico, Liber de centro gravitatis solidorum, 1565

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1 ergo linea ag continenter in duas partes æquales diui­
ſa, relinquetur tandem pars aliqua ng, quæ minor erit lm.

Vtraque uero linearum ag, gb diuidatur in partes æqua­
les ipſi ng: & per puncta diuiſionum plana oppoſitis pla­

nis æquidiſtantia ducantur.
erunt ſectiones figuræ æqua­
les, ac ſimiles ipſis ace, bdf: & totum priſma diuiſum erit
in priſmata æqualia, & ſimilia: quæ cum inter ſe congruant;
& grauitatis centra ſibi ipſis congruentia, reſpondentiaque
16[Figure 16]
habebunt.
Itaque
ſunt magnitudi­
nes quædam æqua­
les ipſi nh, & nu­
mero pares, qua­
rum centra gra­
uitatis in eadem re
cta linea conſti­
tuuntur: duæ ue­
ro mediæ æqua­
les ſunt: & quæ ex
utraque parte i­
pſarum ſimili­
ter æquales: & æ­
quales rectæ li­
neæ, quæ inter
grauitatis centra
interiiciuntur.

quare ex corolla­
rio quintæ pro­
poſitionis primi
libri Archimedis
de centro graui­
tatis planorum; magnitudinis ex his omnibus compoſitæ
centrum grauitatis eſt in medio lineæ, quæ magnitudi­
num mediarum centra coniungit.
at qui non ita res

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