Valerio, Luca, De centro gravitatis solidorvm libri tres

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1quale eſse cono, vel portioni conicæ. Nam circa axim
BD, & ſuper baſim circulum, vel ellipſim, cuius diame­
ter RE, ſimilem & oppoſitam ei, quæ circa AC, deſcri­
batur conus, vel coni portio RDE.
Deinde axe BD bi­
fariam ſecto, & ſingulis eius partibus rurſus bifariam, vt
partes axis BD omnes ſint æquales, per puncta ſectio­
num, quotquot erunt, totidem plana parallela ſecent vnà
cum ſolido AE duas ipſius partes, ſolida ABC, RDE.
Omnes igitur factæ ſectiones, vel erunt circuli, vel ſimiles
ellipſes ei, quæ eſt circa AC, atque adeo inter ſe ſimiles:
talium autem ſectiones communes cum AE parallelo,
149[Figure 149]
grammo per axim, erunt rectæ lineæ, ternæ in ſingu­
lis planis ſecantibus, & in eadem recta linea; vt in proxi­
ma ipſi RE, ſunt FL, GN, KM, quæ quidem erunt
trium circulorum, vel ſimilium ellipſium diametri eiuſdem
rationis baſium trium ſolidorum, cylindri ſcilicet, vel por­
tionis cylindricæ FL, fruſti GL, & portionis KBM, he
miſphærij, vel hemiſphæroidis ABC.
Itaque circa axem
BH cylindri, vel portionis cylindricæ FE, & ſuper ba­
ſes circulos, vel ellipſes circa GN, KM, deſcribantur
cylindri, vel cylindri portiones GP, KQ, qui pat­
tes erunt totius cylindri, vel portionis cylindricæ FE.
Idem fiat circa reliquas axis partes BD tamquam axes,

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