Ghetaldi, Marino
,
Marini Ghetaldi Promotvs Archimedis sev de varijs corporum generibus grauitate & magnitudine comparatis
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reliquas partes quæ deſunt ad 24, explent argento & </
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<
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xml:space
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">ære, ſumendo
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ex vtroque metallo partes æquales in grauitate: </
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<
s
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xml:space
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">atque bis rite interſe
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permixtis componunt aurum deſideratæ qualitatis: </
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<
s
xml:id
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xml:space
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">eamque deno-
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minant à partibus auri puri in mixtione aſumptis. </
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<
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xml:space
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</
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<
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xml:space
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">non prodiret tale prorſus quale facere intendunt, ſed paulo perfe-
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ctius; </
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<
s
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xml:space
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">propterea quod auri quidem partes in mixtione maneant, ex
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argento vero & </
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<
s
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xml:space
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">ære ali quid deper datur, ſolent Aurifices tanto plus
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miſcere argenti & </
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<
s
xml:id
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">æris quantum perdi poſſe deprebenderunt.</
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<
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</
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<
s
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">V erum nostra intentio non est omnia quæ ad eiuſmodi mixtiones
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pertinent boc loco exponere; </
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<
s
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xml:space
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">ſed illud tantum vt receptum apud om-
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nes ad ferre voluimus, ex quo manifeste constat, quæ metallorum
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mixtio in ſingulis qualitatum generibus statuatur: </
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<
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">quæquidem eſt
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illa quam adduximus nempe in auro 23, partium, partes 23, eſſe
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auripuri, & </
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<
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">reliquam quæ deest ad 24, partes conſtare dimidia
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parte argenti, & </
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<
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">dimidia æris in grauitate. </
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<
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">In auro vero 22, par-
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tium, auri eſſe 22, argenti vnam, & </
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<
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">æris vnam, ſic entm iterum
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fumma omnium partium est 24, eademque est ratio de reliquis ita
<
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vt numerus partium auri, ſemper denominet qualitatem auri, & </
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<
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<
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vna medietas reliquarum partium, quæ partibus auri deſunt ad
<
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complendas partes 24, ſit argenti, & </
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<
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xml:id
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">reliqua medietas ſit æris. </
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<
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">bæc
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enim ſatis est ſuppoſuiſſe, ad nouum illud artificium, quo paulo poſt
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inuestig aturi ſumus auri qualitatem ex ſola grauitate quam habet
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in aere & </
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<
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">aqua, eamque qualitatem duplici via inuestigabimus,
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vna per calculum, per tabellam altera: </
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<
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">& </
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<
s
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">quia ad calculum ſpe-
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ctant ea, quæ ſuperius inuenimus de grauitate metallorum bucre-
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ferenda cenſuimus quæ bic ſunt neceſſaria, cuiuſmodi ſunt auri,
<
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argenti, atque æris grauitas, quam obtinent in aere, & </
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<
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">aqua, quæ
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quidem ita ſe babet vt ſequitur.</
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</
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<
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">Auri puri grauitas, quæ in aere eſt 19, erit in aqua 18.</
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<
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">Argenti grauitas, quæ in aere eſt 31, erit in aqua 28.</
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<
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">Aeris grauitas, quæ in aere est 9, erit in aqua 8.</
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">Aurum ad aquam ſe babet in grauitate vt 19, ad I.</
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</
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<
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">Argentum ad aquam ſe babet in grauitate vt 31, ad 3.</
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<
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</
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<
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">Aes ad aquam ſe babet in grauitate vt 9, ad 1.</
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</
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<
s
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">Ex quibus clariſſime colligitur, ſi aliquod corpus mistum con-
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stet partibus æqualibus argenti, & </
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<
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">aeris in grauitate, quantam
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grauitatem babeat in aqua. </
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<
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<
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">quæ ſit ratio in grauitate ipſius mi-
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sti ad aquam ſi enim grauitas aeris in aere ſit 9, eius grauitas in
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aquaerit 8, & </
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<
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