Commandino, Federico, Liber de centro gravitatis solidorum, 1565

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1medis. ergo punctum ν extra priſma af poſitum, centrum
erit magnitudinis compoſitæ ex omnibus priſmatibus gzr,
r βt, tγx, xδk, kδ y, yu, us, sαh, quod fieri nullo modo po
teſt.
eſt enim ex diffinitione centrum grauitatis ſolidæ figu
ræ intra ipſam poſitum, non extra.
quare relinquitur, ut cen
trum
grauitatis priſmatis ſit in linea Km.
Rurſus bc bifa­
riam in diuidatur: & ducta aχ, per ipſam, & per lineam
agd planum ducatur; quod priſma ſecet: faciatque in paral
lelogrammo bf ſectionem χ π diuidet punctum π lineam
quoque cf bifariam: & erit plani eius, & trianguli ghK
communis ſectio gu; quòd punctum u in medio lineæ hK
23[Figure 23]
poſitum ſit.
Similiter demonſtrabimus centrum grauita­
tis priſmatis in ipſa gu ineſſe.
ſit autem planorum cfnl,
adπχ communis ſectio linea ρστ; quæ quidem priſmatis
axis erit, cum tranſeat per centra grauitatis triangulorum
abc, ghk def, ex quartadecima eiuſdem.
ergo centrum
grauitatis priſmatis af eſt punctum ς, centrum ſcilicet

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