Casati, Paolo
,
Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae
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dio habet certam differentiam, vt in ignę
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dixi exceſſum grauitatis aquæ ſupra grauita
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tem globi terreni ex igne & argillâ conflati
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eſſe 89; in quocunque medio conſtituantur,
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eundem habebit exceſſum. </
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>Sic in aëre gra
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uitas 3/4 argillæ & 1/4 ignis eſſet defectiua, vt re
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ctè Galilæus ratiocinabatur, videlicet——
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67 2/3, & grauitas æqualis molis aquæ in aëre
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eſſet poſitiua, nimirùm 21 1/3 (ducto 4 per
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5 1/3) differentia autem, qua maior numerus
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21 1/3 excedit minorem —— 67 2/3, eſt 89 planè
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eadem ac prius. </
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<
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>Satis igitur fuit in vno ali
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quo medio differentiam reperire, cùm illa
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ſemper eadem maneat. </
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<
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>Opportunius verò
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accidit in medio omnium leuiſsimo, in quo
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ignis ipſe globi molem componens nihil
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grauitat, examen illud inſtituere, quia om
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nes partium grauitates poſitiuæ ſunt, nulla
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defectiua. </
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XC
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Ratio
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uitatum</
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duo
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rum corpo
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rum in vno
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medio, est
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eadem iņ
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omni medio.
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>Cæterùm non timui, ne terrenus globus
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auolaret, quemadmodum ouorum putami
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na, vt aiunt, matutino rore impleta & meri
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diano Soli expoſita. </
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>Qui enim tres orbis qua
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drantes intrà aquam exiſtimat grauiores non
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eſſe, quàm ſi ex merâ argilla conſtarent,
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quia aqua illis permiſta nihil grauitat, & aër
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valde leuitat, fortaſsè non item aſſerat tres </
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