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

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1
energiam liberè exercere poſſit; hoc autem falſum̨
eſſe ſic oſtendemus; ablata aqua repleatur vas hydrar­
gyro, quia ex hypotheſi aduer­
131[Figure 131]
ſarij, aer FKG parieti vaſis con­
tiguus
minori vi comprimit ſub­
iectum mercurium K, quàm aer
HB ab eodem pariete magis remo
tus premat ſubiectum mercurium B, & præterea mercu­
rius K, vel ęquilibratur cum mercurio B, vel minori mo­
mento
premit ſubiectum fluidum quam idipsum B, eò quòd il­
le à parietis aſperitatibus impeditur, hic verò libe­
rè premit.
igitur hìc quoque eleuari deberet mons mer­
curialis versùs parietem, vt in aqua contingit, quod
eſt falſum, & repugnat experientiæ, potiùs enim de­
primitur in foueam BGK, non ergo ab illa inæquali
aeris preſſione aqueus monticulus versùs parietem̨
vaſis eleuatur.
Et licèt reſponderi poſſet quòd cauſa
huius diuerſæ operationis pendeat à defectu analo­
giæ mercurij, & parietis vaſis, ob quem ille refugit
huius contactum, non tamen in dubium reuocatur ab
aduerſarijs inæqualis illa aeris preſſio ſupra mercu­
rium, quare in rari caſu operatur vis illa, qua mercu­
rius a vaſis ſuperficie interna ſeparatur vnà cum inæ­
quali vi compreſſiua aeris, ideò in duobus vaſis cy­
lindricis anguſtis RST, & VXZ ſit amplitudo, ſeu
baſis ST maior, quàm XZ in eiſque hydrargyrum in­
fundatur vſque ad B, & E.
Cap. 8. cur
exiguæ aquę
guttæ ſupra
libellam aquæ
aſcendunt.
Et quia non poteſt mercurij ſuprema portio à ſuper­
ficie interna fiſtulæ ſeparari, niſi ſuſpendatur efficien-

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