Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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quieſcat, ſiue circa eius axim
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M conuertatur libra ſemper
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in ſitu horizontali æquilibra
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ta perſiſtet. </
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Cap. 3. flui
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dum in ſuo
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toto quie
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ſcens pon
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derat.</
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">Vt verò ratio huius effectus
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percipiatur, recurrendum eſt
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ad centri grauitatis definitio
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nem, ex qua habetur quòd corpus quodlibet ſuſpen
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ſum à centro grauitatis eius quomodocumque reuol
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uatur circa centrum, ſemper æquilibrari, & haberę
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partes æqualium momentorum, vnde infertur, quòd
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vniuerſa vis, qua corpus aliquod
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tẽdit
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deorsùm, ſci
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licet grauitas eius, exercetur in vnico illo puncto,
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quod centrum grauitatis eius vocatur. </
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<
s
id
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">Hinc deduci
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tur, quod ſi rota, ſiuè pila ſuſtineatur ex centro gra
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uitatis eius ſiuè quieſcat, ſiuè moueatur, numquam
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centrum grauitatis ſitum commutabit, aliàs daretur
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motus perpetuus, qui naturæ legibus repugnat. </
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<
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id
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">Similitèr ſi concipiatur fiſtula vitrea inflexa ad
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modum anuli, vt eſt EFGK, ſitque prædicta fiſtulą
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plena aqua ſituata perpendiculari
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tèr ſuper planum ſubiectum RS à
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quo fulciatur; habebit profectò
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trum</
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grauitatis in eius puncto in
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termedio N, dum quieſcit aqua iņ
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prædicto anulo, at ſi reuoluatur vt
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nimirùm pars EFG deſcendat, reliqua verò GKE
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ſursùm
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, non proindè centrum grauitatis
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feretur</
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ab N versùs O, ſcilicèt intra ſemicirculum̨ </
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