Ghetaldi, Marino
,
Marini Ghetaldi Promotvs Archimedis sev de varijs corporum generibus grauitate & magnitudine comparatis
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ARCHIMEDES.
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quadruplum erit cubus centapli diametri ſphæræ ctanneæ, grauita-
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tem babentis quadruplam primæ, & </
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<
s
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<
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echoid-s964
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xml:space
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">itaque ſi ex eius
<
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multiplicibus, neglectis fractis, eruãtur radices, tanquam ex accura-
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tis numeris cubis, ipſæ indicabunt diametrorum magnitudines in
<
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ratione centupla. </
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<
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xml:space
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">Sed vt etiam euitetur labor multiplicandi prædi-
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ctum numerum 5684210 {10/19}, bac ratione inuenientur eius multi-
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plicia.</
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<
s
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xml:space
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">Prædicto numero 5684210 {10/19}, addatur eius duplum, idect,
<
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11368421 {1/19}, ſumma 17052631 {11/19}, dabit eius triplum, ſi vero ei
<
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addatur eius triplum, id eſt, 17052631 {11/19}, ſumma 22736842 {2/19},
<
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dabit eius quadruplum, & </
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<
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xml:space
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">ſieius quadruplum ei addatur, ſumma
<
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dabit eius quintuplum, & </
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>
<
s
xml:id
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xml:space
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">ſic ſola additione inuenientur eius quot-
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cunque multiplicia.</
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<
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xml:space
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</
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<
s
xml:id
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echoid-s971
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xml:space
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">Eadem ratione inuenientur diametri ſpbærarum ex quacunque
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unsure
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<
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alia materia, ſi enim quæratur de magnitudine diametri verbi gra-
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tia ſpbæræ ferreæ, grauitatem babentis 1, lib. </
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<
s
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xml:space
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">fiat vt grana 1314 {22/37},
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id ect vt grauitas ſpbæræ ferreæ, cuius diameter eſt vnius vnciæ, ad
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grauitatem vnius libræ, id ect ad grana 6912, ita cubus diametri
<
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vnius vnciæ, boc eſt ita 1, ad alium numerum qui ſit 5 {49/190}, is igi-
<
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tur numerus
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erit cubus diametri ſpbæræ ferreæ, grauitatem baben-
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buius.</
note
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tis 1, lib, quare radix cubica numeri 5 {49/190}, dabit quæſitam dia-
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metrum, & </
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<
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xml:space
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">quoniam numerus 5 {49/190}, non eſt præciſe cubus, & </
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<
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non explicabitur eius radix accurate, multiplicetur per 1000000, & </
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<
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<
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ex producto 5257894 {14/19}, neglecto fracto {14/19}, eruatur radix, tan-
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quam ex accurato numero cubo, ea erit 174: </
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<
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<
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xml:space
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">erit centupla ra-
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dicis numeri 5 {49/190}, quia numerus 5 {49/190}, multiplicatus fuit per
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cubum ex 100; </
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<
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xml:space
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">diameter igitur ſpbæræ ferreæ, grauitatem babentis
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1, lib. </
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<
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">erit 1 {74/100}: </
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>
<
s
xml:id
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xml:space
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">deinde ſi duplicetur 5257894 {14/19}, & </
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>
<
s
xml:id
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xml:space
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">ex ita du-
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plicato eruatur radix cubica 219, ea dabit centuplum diametri ſpbæ-
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ræ ferreæ, grauitatem babentis 2, lib. </
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<
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">& </
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<
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xml:space
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">ſi triplicetur, triplicati radix
<
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cubica 250 dabit centuplum diametri ſpbæræ ferreæ, cuius grauitas
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erit 3, lib. </
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<
s
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xml:space
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">ſic reliquarum ſpbærarum in infinitum inuenientur
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diametri. </
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<
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xml:space
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">multiplicia autem numeri 5257894 {14/19}, ſola additione in-
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uenientur, vt dictum ect ſupra de inuentione multiplicium numeri
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5684210 {10/19}. </
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<
s
xml:id
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xml:space
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">Atque bac ratione prædictam tabulam compoſuimus.</
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<
s
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hendit in auro.</
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<
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