Ghetaldi, Marino
,
Marini Ghetaldi Promotvs Archimedis sev de varijs corporum generibus grauitate & magnitudine comparatis
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xml:space
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">I. # II. # III. # IIII.
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272, # 5301, # 215 {1/3}, # 4196 {25/136},</
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tius. </
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<
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xml:space
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">Quartus autem terminus 4196 {25/136}, indicabit grauitatcm
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auri puri, quod est in maſſa propoſita, eam tamen indicabit in par-
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tibus, qualibus tota maſſa constat 5301, quæ quidem grauitas vt
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auri qualitatem indicet, reuocanda erit ad partes qualium tota
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maſſa propoſita est 24. </
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<
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">ſi enim. </
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<
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">fiat vt 5301, ad 4196 {85/136}, ita 24,
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ad 19, aurum propoſitæ maſſæ appellabitur partium 19.</
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<
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<
s
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xml:space
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">Denique ſi quis bunc modum conferat cum illo, quem ſupra tradi-
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dimus, cum argentum explorauimus, quod miſtum in aurea corona
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credebatur; </
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<
s
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xml:space
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">is liquido intelliget bic nibil aliud acceſſiße, niſi quod
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loco argenti, aſſumptum ſit corpus ex argento & </
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<
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xml:space
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">ære mistum, eo
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quod bæc duo metalla tantum in alligationibus auri ſoleant adbibe-
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ri, vt diximus. </
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>
<
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xml:space
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">Quod ſi conſtaret plura alia aſſumpta eſſe, etiam in
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quauis alia ratione, facile erit cuiuis ad ſimilitudinem buius, for-
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mare alium modum, ſed nos, ne longiores ſimus, ad vſum ſequentis
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tabulæ nos conferamus, quaillis conſultum volumus qui minus in
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præceptis Aritbmeticis ſunt exercitati, vel illis, qui alias ob cauſas
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tabulis vti malunt, quam calculis.</
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</
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<
s
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xml:space
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">Hæc tabula accommodata eſt primarie ad aurum vnius libræ, vt
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apparet in ſecũda ipſius columna in qua omnes numeri ſunt unita-
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tes, reſpon dentes ſingulis Denominatoribus qualitatum auri, à deno
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minatore partium 24, vſque ad denominatorem qualitatis partis ò,
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quamuis proprie loquendo nulla ſit qualitas auri partis nullius, quia
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tunc non eſſet aurum, ſed mistum ex argento & </
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<
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">ære. </
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<
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xml:space
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">Hos denomi-
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natores auri omnes inuenies in prima columna ſub titulo qualitatis.
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</
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<
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">In columna vero ſub titulo misti placuit etiam deſcribere denomi-
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natores miſti ex argento & </
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<
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xml:space
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">ære, vt vnico intuitu appare at quot par-
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tes auri puri, & </
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<
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">quot partes misti ex argento & </
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<
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">ære contineantur
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in ſingulis qualitatibus.</
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<
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xml:space
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">Porro in area tabulæ ſub titulo grauitatis auri in aqua poſita est
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grauitas auri cuiuslibet qualitatis quam obtinet in aqua, quæ qua
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ratione inueniatur, dicetur inferius vbi agetur de compoſitione,
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eiuſdem tabulæ.</
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<
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">V ſus eius ſunt duo, quorum alterum titulus indicat, nimirum vt
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tabulæ beneficio reperiatur ex grauitate auri quam babet in aere & </
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aqua, eius qualitas. </
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<
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xml:space
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">Alter vero est vt cognoſcatur grauitas in aqua,
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quando vnà cum grauitate quam aliquod aurum babet in aere da-
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tur ipſius qualitas. </
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<
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">& </
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<
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">de boc vfu cum ſit ſimplicior prius nobis erit
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agendum.</
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