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

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1
Cap. 3. flui­
dum in ſuo
toto quie­
ſcens pon­
derat.
Cap. 3. flui­
dum in ſuo
toto quie­
ſcens ponde­
rat.
PROP. XIV.
Id ipſum in ſiphone comprobatur.
PRæterea vſurpetur idipſum vas vitreum, ſed in­
flexum, vt eſt AMOP ſiphonis inuerſi figuram
referens, atque portio ANO aquą
18[Figure 18]
impleatur, reliqua verò fiſtula OP o­
leo.
Et quia vt mox oſtenſum eſt ex
aduerſarij hypotheſi tota aqua AM
vim non infert neque impellit infe­
riorem aqueam laminam MN, cùm̨
nullam grauitatem ſuper eam exer­
ceat; igitur tota moles aquea AM nil prorsùs impel­
let terminum aquæ O & proindè ab hoc non impelle­
tur ſurſum oleoſus cylinder OP, igitur oleum OP
nulla ratione ſubleuari ſursùm deberet, ſed hoc eſt
falſum, igitur falſa eſt quoque hypotheſis aſſumpta,
quòd aqua in ipſamet aqua poſita grauitatem noņ
exerceat.
Et profectò methodus ac criterium dignoſcendi,
an corpus aliquod grauitet, atque impellat alterum,
erit huiuſmodi; conſiderari nimirum debent effectus
ab eo producti, & quanta vis contraria requiritur,
vt vnum à conſortio, & contactu alterius diuellatur,
& ſeparetur, & quia ſi nauis natando lateraliter ſco­
pulum contingeret, poſſet à quacumque exigua vi tra­
hi, diuelli, & ſeparari ab eodem ſcopulo, hinc in re
optimo inferemus nauim omninò carere vi motiua, &

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