DelMonte, Guidubaldo, In duos Archimedis aequeponderantium libros Paraphrasis : scholijs illustrata

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1ſenſerit, demonſtrationeſquè tantùm de planis concludere exi
ſtimauerit
, vel de ſolidis, non autem quibuſcun〈que〉, ſed vel de
rectilineis
, vel de homogeneis tantùm, & de ijs, quæ inter ſe
ſunt
eiuſdem ſpeciei, longè aberrat à ſcopo, & mente Archi­
medis
.
etenim in his ſemper loquitur. vel de grauibus ſimpli
citer
, veluti in primis tribus theorematibus; vel de magnitu
dinibus
, vt in reliquis quin〈que〉 quod quidem nomen tam
planis
, quàm ſolidis quibuſcun〈que〉 eſt commune, vt etiam ij,
qui
parùm in Mathematicis verſati ſunt, ſatis norunt.
ſicu­
ti
etiam Euclides, dum quinti libri propoſitiones pertracta­
uit
, quantitatem continuam ſub nomine magnitudinis com
prehendit
.
quòd autem nomen grauis ſit commune, iam ſatis
per
ſe conſtat.
Perſpicuum eſt igitur priora hæc octo Theo
remata
communia eſſe, tam planis, quàm ſolidis.
ac non ſo­
lùm
ſolidis eiuſdem ſpeciei, & homogeneis, verùm etiam ſoli
dis
diuerſæ ſpeciei, & hęterogeneis, vt ſuo loco manifeſtum
fiet
.
Iactoquè hoc fundamento, quod Archimedes in duobus
propoſitionibus
, ſexta nempè, & ſeptima demonſtrauit; in
ctaua
tanquam corrollarium colligit.
Deinceps peculiariter
pertractat
de centro grauitatis planorum, nec amplius plana
nominat
magnitudinis nomine, ſed proprijs cuiuſcun〈que〉
nominibus
; vt parallelogrammi, trianguli, & aliorum huiuſ­
modi
.
& in hac parte deſcendit ad particularia. quippè cùm
& ſi non actu fortaſſe, virtute tamen cuiuſlibet particularis
plani
centrum grauitatis nos doceat.
in primo enim libro
ſat
ſi bi viſum eſt oſtendiſſe centra grauitatum triangulorum,
ac
parallelogrammorum, ex quibus cæterarum figurarum,
veluti
pentagoni, hexagoni, & aliorum ſimilium centra gra­
uitatis
inueſtigare non admodum erit difficile.
ſiquidem hu
iuſmodi
plana in triangula diuiduntur.
vt in ſine primi li­
bri
attingemus.
In ſecundo autem libro altiùs ſe extollit, &
moro
ſuo circa ſubtiliſſima theoremata verſatur; nempè cir
ca
centrum grauitatis conice ſectionis, quæ parabole nun­
cupatur
.
nonnullaquè præmittit theoremata, quæ ſunt tan­
quam
præuie diſpoſitiones ad inueſtigandam demonſtra­
tionem
centri grauitatis in parabole.
Ita〈que〉 perſpicuum eſt,
Archimedem
propriè elementa mechanica tradere.

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