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

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1
Aliud falsum
experimentum
ab eodé au­
thore allatum
Cap. 4. poſi­
tiuam leui­
tatem noņ
dari.
64[Figure 64]
Sit igitur vas ABCD in cuius funshy;
do
aperiatur amplum foramen BC,
ſit poſtea ligneus cylindrus FE,
cuius baſis HE paulò amplior ſit
foramine vaſis, vt nimirum poſſit
ipſum præcisè occludere, obſtrue­
reque ſimplici contactu; repleatur
poſtea vas aqua vſque ad AD, ſup­
ponit aduerſarius, quòd cylindrus
FE non poſſit in fundo vaſis deti­
neri, niſi deorsum vi impellatur vir­
ga quadam ferrea ML præterea
ait, quòd ſi occluſo infimo foramine BC, eodem mo­
mento temporis recludatur os infimum, remoueatur­
que virga ML, fore vt aqua exeat per infimum os
BC, & lignum FE aſcendat ſursùm, quod, ſubdit ip­
ſe, eſt argumentum certisſimum leuitatis poſitiuæ eiuſdem
ligni.
Et hic primò obſeruo contra aduerſarij aſſer­
tionem, quòd ſi baſis cylindri HE zona circularis
præcisè tangat, & exoſculetur perimetrum orificij
putei BC, tunc non requiritur epiſtomium vt aquą
è vaſe non effluat, neque requiritur impulſus virgæ
LM, vt prohibeatur aſcenſus cylindri FE è fundo va­
ſis, ſed ibidem quieſcet, veluti ſi tenacitèr colliga­
tus eſſet ab illo contactu ſimplici.
Imò, quod magis
mirere, ſi infima zona baſis HE ipſius cylindri lignei
non perfectè congrueret; neque compleret vndique
tangendo orificium infimum BC, ſed per rimulas,
vel angulos aliquos aqua deorſum efflueret, tunc

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