Casati, Paolo
,
Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae
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(5 246/1000): Vel ſi per eundem partium numerum
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diuidatur leuitas abſoluta——8756 2/3, erit ſpe
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cifica molis compoſitæ leuitas in aquâ (27/1000).
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Quarè ſi inter nos conueniat, quota portio
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terreni huius globi incluſis ignibus tribuen
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da ſit, quota aëri cæterisque halitibus aquâ le
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uioribus, facilè innoteſcet, vtrùm leuitas vin
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cat grauitatem, ducto partium numero per
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leuitatis aut grauitatis denominatorem. </
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Merſ.
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<
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> Quod quidem ſpectat ad ingen
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tem illam ignium cauernam, qui terræ cen
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trum circumobſident, memini me ab acu
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tiſsimo æquè ac diligentiſsimo ſydereorum
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arcanorum ſcrutatore Gottifredo Wendeli
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no aliquid planè ſingulare accepiſſe, quod
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ſummoperè placuit. </
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<
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>Hic terræ ſemidiame
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trum in partes 100 tribuens, cauernæ æſtuan
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tis ſemidiametro partes 63 concedebat, reli
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quas 37 denſitati cruſtæ huius extimæ; vnde
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fit ignem illum eſſe quartam totius globi
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partem (cubus enim ex 63 eſt ſubquadru
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plus cubi ex 100) cum ſit globus ille igneus
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ad totum globum in triplicatâ ratione dia
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metrorum. </
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<
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>Ne verò id ab ipſo temerè ex
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cogitatum videretur, addebat, præter pro
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babiles coniecturas & rationes non paucas, </
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