Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

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1quidnam admiſſo, vel negato prædicto peripatetico

aſmpto ſubſequatur.
Cap. 4. poſi­
tiuam leui­
tatem noņ
dari.
PROP. LIX.
Aliter id ipſum ostendere, poſito, quòd aer vi leuitatis per
diuerſa media fluida aſcendat.
SIt igitur idem mobile B, quod ſit lignum leuiſſi­
mum, vel veſica aere plena, impellaturque vſque
ad fundum vaſis DCFE cuius medietas infima reple­
atur aqua A, reliqua medietas ſuprema O repleatur
oleo, vel ſpiritu vini, & ponamus leuitatem aereæ
veſicæ B eſſe trium graduum, & leuitatem ſpiritus
vini duorum graduum, at leuitatem aquæ magis den­
ſæ
eſſe vnius gradus.
Manifeſtum eſt, quòd reſiſten­
tia aquæ A, & partium tenacitas, quæ penetrari de­
bet à ligno, vel veſica B dùm ſursùm aſcendit, erit tan­
maior reſiſtentia ſpiritus vi­
51[Figure 51]
ni O quantùm illa eſt magis den­
ſa
, & conſtipata quàm iſte, ſci­
licèt ſi ſumantur moles æquales
eorumdem fluidorum, quantò
maior eſt corpulentia, & mate­
ria, quæ prędictum aqueum ſpa­
tium replet ea materia quæ molem ſpiritus vini oc­
cupat, & quia leuitatem ſpiritus vini ad leuitatem aquæ
eamdem proportionem habere aiunt, quam illius
raritas ad huius raritatem, igitur tantò magis diſtra­
hibilis, & minùs reſiſtens erit ſpiritus vini, quàm̨

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