Ghetaldi, Marino
,
Marini Ghetaldi Promotvs Archimedis sev de varijs corporum generibus grauitate & magnitudine comparatis
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oporteat ſcire quanta erit grauitas plumbi magnitudinem habentis
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æqualem propoſitæ aquæ B, verbi gratia ſit vas aliquod plenum aqua,
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cuius aquæ grauitas ſit 100, & </
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tur plumbo, quanta illius plumbi erit grauitas. </
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<
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plumbeum corpus D, cuius grauitas ſit 23, deinde aquæ magnitudinĕ
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habentis æqualem plumbo D, inueniatur grauitas, quod quomodo fie-
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ri oporteat iam dictum eſt in antecedentis problematis exemplo: </
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tur ea inuenta grauitas 2, & </
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">fiat vt 2, ad 23, ita 100, ad alium nume-
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rum qui ſit 1150, is igitur numerus erit grauitas plumbi magnitu-:
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</
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<
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">dinem habentis propoſitæ aquæ B, æqualem, hoc est illius plumbi, quod
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in vaſe continetur.</
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">At vero ſi propoſitũ fuerit inuenire quãta erit grauitas ceræ,
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aut ligni, aut cuiuſcũque ſolidi leuioris quam aqua, nihil diuer
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ſi in opere accidet, niſi quod ratio inueniendi grauitatem
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aquæ magnitudinem habentis æqualem corpori ſolido leuio-
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ri, quàm aqua, differt in aliquo à ratione, qua inuenitur graui-
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tas aquæ magnitudinem habentis æqualem ſolido corpori
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grauiori, quam aqua, ſed vtramque rationem exemplo ante-
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cedentis Problematis illuſtrauimus, in eo enim ſatis explica-
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tum eſt de vtraque.</
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">Sed ne exemplorum inopia laborare videamur, ſit inuenienda gra-
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uitas ceræ magnitudinem habentis æqualem propoſitæ aquæ B, acci-
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piatur aliquod cereum corpus D, cuius grauitas ſit 21, deinde aquæ
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magnitudinem habentis æqualem ceræ D, inueniatur grauitas, vt in
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antecedentis Problematis exemplo dictum est, quæ grauitas ſit 22, & </
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fiat vt 22, ad 21, ita 100, hoc est grauitas aquæ B, ad alium numerum
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qui ſit 95 {5/11}. </
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">is igitur numerus indicabit quanta erit grauitas ceræ
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magnitudinem habentis æqualem propoſitæ aquæ B.</
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<
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vini, aut cuiuſcumque liquidi, præter argenti viui, eadem om-
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nino via, qua ante, inuenietur quæſita corporis ſolidi grauitas,
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ſed de argento viuo tractabimus ad finem propoſitionis deci-
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mæ quartæ.</
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ſolido, altero liquido, data ſolidi corporis </
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