Valerio, Luca
,
De centro gravitatis solidorvm libri tres
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figurarum duobus prædictis figuris vnum quid
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componentibus, & circa eundem axim, vel diame
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trum exiſtentibus, qua ratione diximus, circum
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ſcriptarum, centra grauitatis ſint in diametro, vel
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axe; etiam compoſiti ex ijs duobus reſiduis (vt in
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priori libro generaliter demonſtrauimus, cen
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trum grauitatis erit in eadem diametro, vel axe:
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vnde vim habent proximæ quatuor anteceden
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tes demonſtrationes, exemplum erit in demon
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ſtratione trigeſimæ quartæ huius. </
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PROPOSITIO XXXIII.
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>Hemiſphærij centrum grauitatis eſt punctum
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illud in quo axis ſic diuiditur, vt pars, quæ ad ver
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ticem ſit ad reliquam vt quin que ad tria. </
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>Eſto hemifphærium ABC cuius vertex B, axis BD:
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ſit autem BD ſectus in G puncto, ita vt pars BG ad GD
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ſit vt quinque ad tria. </
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<
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>Dico G eſse centrum grauitatis
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hemiſphærij ABC. </
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>Abſcindatur enim BK ipſius BD
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pars quarta: & ſuper baſim eandem hemiſphærij eundem
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que axim BD cylindrus AF conſiſtat, & conus intelli
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gatur EDF, cuius vertex D, baſis autem circulus circu
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lo AC oppoſitus, cuius diameter EBF. </
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<
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BD bifariam in puncto H, & ſingulis eius partibus rur
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ſus bifariam, quoad BD ſecta ſit in partes æquales cu
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iuſcumque libuerit numeri paris, tranſeant per puncta ſe
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ctionum plana quædam baſi AC parallela, & ſecantia,
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hemiſphærium, conum, & cylindrum, quorum omnes ſe
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ctiones erunt circuli, terni in codem plano ad aliam atque </
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