Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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ueri, at fluidum collaterale D, quòd ſit hydrargyrum
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ſupponatur deorsùm tantummodò vim exercere, vt
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exigit maxima eius grauitas, nec prorsùs ſursùm im
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pellere, tunc quoque libra, ſeù
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rota perpetua efformabitur iņ
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qua ſemper terminus B trahetur
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ſursùm à poſitiua leuitate ipſius
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ligni F aſcendetque versùs R,
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terminus verò oppoſitus depri
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metur ab A versùs H vt naturą
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grauitatis exigit, & quia hi duo motus, & conatus in
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oppoſitis terminis libræ
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ſunt, ergò viciſſim
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ſe non deſtruunt, nec contrariantur, ſed ſe mutuò fa
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uent, & adiuuant. </
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">igitur conatus, & impetus quo re
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uoluitur iam dicta libra, ſcilicèt quo lignum F aſcen
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dit à fundo mercurij æqualis erit non differentiæ, ſed
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aggregato ex vi leuitatis F, & ex facultate ponderis
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mercurij D. </
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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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PROP. LIV.
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Si verò tam ſolidum, quàm fluidum exerceant leuitatem,
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atque grauitatem, vis motiua, qua vnum eorum ele
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uatur æqualis eſt aggregato ex differentia leui
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tatum vnà cum differentia grauitatum
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earum.
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<
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">TAndèm ſi ſupponamus, quod lignum vim faciat
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ſursùm vt leue, & etiam eodem tempore gra
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uitatem eius natiuam exerceat, pariterque aqua D </
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