Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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ret menſuram præciſam grauitatis fluidi, propterea
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quòd magis aut minùs, quàm opus eſt, deprimit
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prædictæ fiſtulæ, & ſic menſuram alteratam, & falla
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cem deſignat, quæ tandem cùm in aqua vnum, vel al
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terum granum excedere queat, in mercurio verò mul
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tò magis, non poſſunt abſque erroris ſuſpicione vſur
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pari cum agitur de examine ponderum exiguorum. </
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Cap. 9. de
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corpuſculo
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rum
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tium</
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mutuo
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amplexu at
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que fuga.</
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(quam hydroſtaticam libellam nonnulli
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) non
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nullis difficultatibus ac fallacijs obnoxia ſit. </
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quia ſi fiſtulæ vitreæ erectæ perpendicularitèr ad pla
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num horizontis non fuerint præcisè æquè amplæ,
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procùl dubio argines aqueos internos inæquales effi
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cient, ideoque planum per ſummitates
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aque
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orum extenſum non erit horizonti æquidiſtans, idip
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ſum continget ſi prædictæ duæ fiſtulæ erectæ fuerint
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æquales inter ſe, at non ſint omninò ſordibus vnctuo
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ſis purgatæ, & terſæ, cùm pinguedo illa prohibeat ar
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ginis aquei eleuationem magis, aut minùs pro copią
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aut defectu prædictæ pinguedinis. </
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<
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ſtularum fuerit internè arida, reliqua verò madefacta,
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argines quoque aquei in madida fiſtula eleuantur,
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abbr
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verò in arida. </
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mentum, cùm enim aqua numquam pura, & ſincerą
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haberi poſſit, fit vt niſi bullulæ aereæ quibus num
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quam aqua ſpoliatur, æquè diſtributæ ſint in vtraque
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fiſtula, erunt moleculæ illæ aqueæ inæ qualitèr gra
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ues ſpecie, & ideò earum ſummitates habebunt inæ-</
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