Borelli, Giovanni Alfonso - De motionibus naturalibus a gravitate pendentibus

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

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1
ueri, at fluidum collaterale D, quòd ſit hydrargyrum
ſupponatur deorsùm tantummodò vim exercere, vt
exigit maxima eius grauitas, nec prorsùs ſursùm im

48[Figure 48]
pellere, tunc quoque libra, ſeù
rota perpetua efformabitur iņ
qua ſemper terminus B trahetur
ſursùm à poſitiua leuitate ipſius
ligni F aſcendetque versùs R,
terminus verò oppoſitus depri
metur ab A versùs H vt naturą
grauitatis exigit, & quia hi duo motus, & conatus in
oppoſitis terminis libræ contrarij ſunt, ergò viciſſim
ſe non deſtruunt, nec contrariantur, ſed ſe mutuò fa
uent, & adiuuant. igitur conatus, & impetus quo re
uoluitur iam dicta libra, ſcilicèt quo lignum F aſcen
dit à fundo mercurij æqualis erit non differentiæ, ſed
aggregato ex vi leuitatis F, & ex facultate ponderis
mercurij D.

Cap. 4. poſi
tiuam leui
tatem noņ
dari.

PROP. LIV.

Si verò tam ſolidum, quàm fluidum exerceant leuitatem,
atque grauitatem, vis motiua, qua vnum eorum ele
uatur æqualis eſt aggregato ex differentia leui
tatum vnà cum differentia grauitatum
earum.

TAndèm ſi ſupponamus, quod lignum vim faciat
ſursùm vt leue, & etiam eodem tempore gra
uitatem eius natiuam exerceat, pariterque aqua D

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