Commandino, Federico
,
Liber de centro gravitatis solidorum
,
1565
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ſimiliter demonſtrabitur totius priſmatis aK grauitatis ef
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ſe centrum. </
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<
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">Simili ratione & in aliis priſmatibus illud
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idem facile demonſtrabitur. </
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<
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">Quo autem pacto in omni
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figura rectilinea centrum grauitatis inueniatur, docuimus
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in commentariis in ſextam propoſitionem Archimedis de
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quadratura parabolæ.</
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<
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">Sit cylindrus, uel cylindri portio ce cuius axis ab: ſece
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turq,
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plano per axem ducto; quod ſectionem faciat paral
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lelogrammum cdef: & diuiſis cf, de bifariam in punctis
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gh, per ea ducatur planum baſi æquidiſtans. </
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<
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">erit ſectio gh
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circulus, uel ellipſis, centrum habens in axe; quod ſit K at
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que erunt ex iis, quæ demonſtrauimus, centra grauitatis
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planorum oppoſitorum puncta ab: & plani gh ipſum k in
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quo quidem plano eſt centrum grauitatis cylindri, uel cy
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lindri portionis. </
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<
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id
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">Dico punctum K cylindri quoque, uel cy
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lindri portionis grauitatis centrum eſſe. </
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id
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">Si enim fieri po
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teſt, ſit l centrum:
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ducaturq;
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kl, & extra figuram in m pro
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ducatur. </
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<
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">quam ucro proportionem habet linea mK ad kl </
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