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

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1
Circumſtan­
tia notatu di­
gna in tali
experimen­
to affertur
ab aduerſa­
rio.
Cap. 4. poſi­
tiuam leui­
tatem noņ
dari.
PROP. LXXVIII.
Cauſa ſeparationis aerei cylindri è fundo vaſis eſt pondus
aquæ ambientis.
INtelligatur denuò fiſtula RV plena aqua, in quą
exiſtat aereus cylindrus PORX in parte eius ſu­
60[Figure 60]
prema operculo XR
clauſa, poſtea circa pun­
ctum
V fixum reuolua­
tur deorsum fiſtula tranſ­
ferendo
nimirùm latus
VX in locis VF, VG,
VH, & VK, manifeſtum
eſt, quod in ſitu VF pro
pter vaſis inclinationem
ſuperficies PO aquæ
POSV non perſeuera­
bit in eodem ſitu incli­
nato, cùm aqua natura­
li inſtinctu æquabili ſi­
tu ad horizontem parallelo diſponi, redigique de­
beat, quaproptèr à ſitu decliui PO deſcendet inferiùs
versùs ſuperficiem BDA horizonti parallelam, veluti
exigit ſitus, & pendentia fiſtulæ VFR.
Hinc ſequi­
tur, vt aqua excurrat ad occupandum ſpatium ODAR,
à quo aer expulſus deueniet ad replendum ſpatium
ſupremum ab aqua derelictum, ſcilicèt PEBD.
Pro­
grediamur modò ad ſituationem fiſtulæ horizontalem

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