Ghetaldi, Marino
,
Marini Ghetaldi Promotvs Archimedis sev de varijs corporum generibus grauitate & magnitudine comparatis
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0022
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tudinem habentis æqualem ceræ F, quæ ſit 22, fiat vt 21, ad 22, ita
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2100, ad alium numerum qui ſit 2200; </
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<
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">erit igitur grauitas aquæ ma
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gnitudinem habentis æqualem ceræ A, 2200.</
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<
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">Neque neceſſe eſt, vt illud corpus ſolidum magni ponderis
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reipſa proponatur, ſufficit enim vt eius grauitas notificetur
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numero tantum.</
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<
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xml:space
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">Si autem propoſitum fuerit inuenire quanta erit graui-
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tas argenti viui magnitudine æqualis propoſito corpori ſo-
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lido A; </
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<
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">ratione qua ſupta, non inuenietur ipſa grauitas, quo-
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niam nullum corpus demiſſum in argentum viuum fertur
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deorſum, niſi aurum, aurum vero in ipſo argento viuo perrum-
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pitur, ſed qua ratione inuenienda ſit ipſa argenti viui graui-
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tas, dicemus ad finem exempli propoſitionis decimæquartæ.</
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<
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">COrpus quod ponderandum proponitur ſeta equina ex altera li-
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bræ lance appendatur, in altera lance ponantur pondera, & </
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pus appenſum demittatur in aquam, ita vt in aqua libere pendeat, ne-
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que lancem, cui appenſum est corpus, neque aliam in qua ſunt pondera
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aqua contingat, & </
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">ita ponderetur propoſitum corpus, ac ſi in aere pen
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deret.</
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">Dixi ſeta equina corpus ponder andum debere appendi, quia fere
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æque grauis eſt atque aqua, & </
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">ideo nihil addet, vel minuet grauita-
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tis in ipſo corpore ponderando.</
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<
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">Quod ſi corpus ponderandum fuerit, tam graue, vt ſeta ſimplici ſu-
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stineri nequeat, appendatur pluribus ſimul iunctis ſetis, & </
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<
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">ne aliquid
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grauitatis ſetarum coniunctio addat corpori ponderando, ponantur
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in altera lance totidem ſetæ æquales eis, quæ ex lance, cui appenſum eſt
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corpus pendent, vſque ad corpus appenſum, hac igitur ſetarum addi-
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tione æque ponderabunt lances, & </
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">quamuis illæ ſetæ, quibus appen-
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ſum est corpus, ſint longiores, quam aliæ alteri lanci additæ, longitudi-
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ne partium, quibus ligatum est corpus, tamen quoniam illæ partes
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æque graues ſunt, atque aqua, exiſtentes cum ipſo corpore in aqua, nul-
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lam grauitatem habebunt, & </
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partibus, & </
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bus, nempe, vt dictum eſt, illis partibus cum ipſo corpore in aqua Sic
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igitur in aqua ponderanda erunt ſolida corpora, quod animaduertiſſe
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fuit operæ pretium.</
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