Ghetaldi, Marino
,
Marini Ghetaldi Promotvs Archimedis sev de varijs corporum generibus grauitate & magnitudine comparatis
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">I. # II. # III. # IIII.
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1 {1227/5301}, # 24, # 1 {139/5301}, # 20,</
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erit denominator qualitatis auri de qua quæritur quia ille termi-
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nus indicat partes auri puri in grauitate, qualibus maſſa propoſita
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constat 24. </
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<
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">Et quia in propoſito exemplo bæ partes, nempe vnc. </
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<
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xml:space
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">20, ſunt par-
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tes vigeſimæ quartæ 24, vnciarum, quæ constituunt grauitatem to-
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tius maſſæ. </
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<
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<
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rum propoſitum eße 20, partium. </
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<
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xml:space
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">Quando vero grauitas totius maſ-
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ſæ non exprimitur per numerum 24, tunc opus erit inquirere quot
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partes vigeſimas quartas totius grauitatis efficiat quartus ille pro-
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portionis terminus vt in ſequenti exemplo clarius apparebit.</
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<
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<
s
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">Sit enim propoſita alia auri maſſa cuius grauitas in aere ſit 5301
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in aqua vero 4988, ſi igitur bic numerus ſubtrabatur ex numero to
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tius grauitatis 5301, rcliqaus numerus 313,
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erit grauitas aquæ
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propoſitæ maſſæ magnitudine æqualis. </
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<
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">duæ aliæ
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grauitates aquæ, vnare ſpondentis auro puro magnitudine, altera.
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</
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<
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<
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">ære, ita tamen vt grauitas tum auri pu-
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ri, tum corporis misti ſit eadem quæ maſſæpropoſitæ, non ſecus ac in
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præcedenti exemplo factitatum est. </
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<
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">boc eſt primo fiat vt 19, ad 1, ita
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5301, ad 279, bic enim numerus erit grauitas aquæ magnitudinem
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babentis æqualem auro puro, cuius grauitas eſt 5301. </
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<
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vt 279, ad 29, ita rurſum grauitas 5301, ad aliam, bac enim ratione
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producetur numerus 551, debitus grauitati aquæ, magnitudine,
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æqualis corpori miſto ex argento & </
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<
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cum eadem maßa propoſita. </
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<
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tur eo ordine quoſupra; </
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<
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<
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xml:space
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">Grauitas aqu & magnitu- \\ dine & qualis auro puro. # Grauitas agua & qualis \\ maſlæ propoſita. # Grauitas aquæ æqualis \\ corpori miſto.
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279 # 313 # 551</
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tertiam, nec non inter ſecundam & </
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<
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tuatur pro primo proportionis termino prior differentia 272, & </
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tertio posterior 238. </
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<
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">grauitas vero maſſæ propoſitæ 5301, ponatur
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pro ſecundo termino, & </
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<
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272, # 5301, # 238, # 4638 {51/136}.</
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ſenti exemplo eſt 4638 {51/136}, is
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enim indicabit grauitatem auri
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buius.</
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puriin maſſa propoſita. </
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<
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ſa in partibus vigeſimis quartis totius grauitatis, id quod ad </
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