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

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1
ſariam, non poterit tribui prudenti illi cognitioni, ſeù
potiùs chimæricæ.
Cap. 12. dę
vacui neceſ­
ſitate.
PROP. CCLI.
In ſiphone inuerſo retracto embolo aqua aſcendit non ſpontè,
ſed impulſa à maiori pondere, vel momento aquæ alteri­
us brachij ſiphonis.
VT que hoc quanta fieri poteſt perſpicuitate
oſtendamus, intelligatur ſipho ABCD aqua
repletus, cuius crura AB, & DC perpendicularitèr ad
horizontem erecta ſint, tunc embolum cum ſuo aſſario
EFG, & cum fiſtula DC ſyringam compleat, & immiſſo
embolo intra fiſtulam quouſque eius baſis FG fundum
fiſtulæ C attingat, tunc patet, quòd aqua BC officium
bilancis ſupplet, in cuius extremo B ſuperponitur mo­
les aquæ grauis AB, alteri ve­
180[Figure 180]
rò extremitati C exigua aquæ
laminula FC imminet, & pro­
indè ſi reliqua eius portio FD
vſque ad horizontalem AD,
eſſet vel aere repleta, vel om­
ninò exinanita, & vacua, pro­
cùl dubio aqua FC ſursum aſcen­
deret
versùs D, non quidem ſponte ſua, ſed impulſa à

maiori contrapoſito pondere aquæ AB; propterea
quod in libra imaginaria fluida BC pars B magis preſ­
ſa à maiori pondere imminentis aquæ AB expellere
ſursùm debet minùs grauem aquæ molem FC, quouſ­
que ad æquilibrium in plano horizontali AD perdu­
catur; his præmiſſis retrahatur embolum EFG ſursùm

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