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

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eleuatur per ſpatium BE; ſi poſteà eadem fiſtulą
profundiùs demergatur infra aquam, vel inclinetur,
135[Figure 135]
aqua exucta maius ſpatium BC occupa­
bit.
His poſitis tranſportetur integra fiſtu­
la vnà cum aqua contenta ab aqua ad aerem,
perpendicularitèr tamen erecta ad planum
horizontis tunc effluere cunctanter conſpi­
citur ab infimo orificio B guttula quædam,
quæ ſenſim colligitur, tumeſcitque; & hoc
contingit quando valdè excedens eſt alti­
tudo aquę BC, at ſi non nimia fuerit, quieſcet
in ſitu perpendiculari abſque eo quòd ex
orificio B defluat noua aquæ gutta.
Modò
dum aqua ſupra terminum E versùs C perſeuerat orificium
fiſtulæ B contingat aquam vaſis, vel guttulam D ſu­
ſpenſam à palma manus, vel adhærentem externæ,
& extremæ parti ipſius fiſtulæ B, videbis aquam BC
deprimi deorsùm vſque ad E, vbi nimirùm conſiſte­
bat aqua exucta è vaſe, quando interna cauitas hu­
mectata fuerat; è contrà ſi altitudo aquę internæ val­
de diminuta fuerit, vt BG, tunc quidem in contactu
guttulæ inferioris augetur eius altitudo exugendo
nimirùm aquam ipſius guttulæ D.
Cap. 8. cur
exiguæ aquæ
guttæ ſupra
libellam aquæ
aſcendunt.
Ratio huius admirandi effectus videtur pendere
ex legibus æquilibrij aquæ externæ, & internæ.
pri­
mò quando gutta pendula D adhæret inſimo fiſtulæ
orificio, concipere debemus ſuperficiem externam̨
prædictæ guttulæ pendentis eſſe veluti ſacculum, vel
burſam compoſitam ex machinulis aqueis variè con-

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