Stevin, Simon
,
Mathematicorum hypomnematum... : T. 4: De Statica : cum appendice et additamentis
,
1605
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4 L*IBER* S*TATICÆ*
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aquæ magnitudine ſibi æqualis levius eſt in aqua BC quam foret in aëre. </
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demonſtraſſe oportuit.</
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">Data corporis ſolidi gravitate, ejusque materiæ ponde-
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ritatis ratione ad ponderitatem aqueam; </
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ſitus gravitatem invenire.</
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">1 Exemplum cum corpus ſolidum materiæ levioris erit
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quam aqua.</
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">* Aqua AB, corpus ſolidum Cpendens 2 ℔, hinc ponderitatis
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aqueæ ad corporis ſolidi materiæ ponderitatem ratio quintupla eſto.</
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">Quanta gravitas ſit aqueæ molis ipſi C æqualis ex-
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pendito, ea erit bis quinarũ librarú hoc eſt 10 ℔ quibus
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deductis de 2 ℔, relinquentur -- 8 ℔ ſolidi corporis
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C, quæ ſunt levitas ſeu aſcenſus corporis C in data
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aqua AB.</
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aquam AB immiſſum, contra quod, ut in diagramma-
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te perſpicis, ſuſpenſum ſit pondus D 8 ℔ hocſitu D & </
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C æquiponderabunt.</
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quam aqua, cujus pragmatia antecedenti affinis eſt.</
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">* Ratio ponderitatis aqueæ, ut ſupra AB, ad ponderitatem ma-
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teriæ ſolidi C nunc ſumitor ſubquadrupla, atque ipſum corpus C 12 ℔.</
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ipſi C æqualis, eaque deprehendetur {1/3} 12 librarum quas
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C pendet, eæ igitur erunt 3 ℔, quæ deductæ de 12 ℔ ſo-
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lidi C, reliquas faciunt 9 ℔ pro pondere C in aqua AB.</
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pus C, cui ex oppoſito ſuſpendatur D 9 ℔; </
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& </
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