Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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165
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eſt ſaltus, & proſilitio ligni ab aqua leuitatis eius
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poſitiuæ, quandoquidem prædictus ſaltus effici po
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teſt in vtraque hypotheſi, ſcilicèt ſiuè admittatur,
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ſiuè negetur leuitas poſitiua. </
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Lib. de vi
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ca. 9.</
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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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<
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id
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">Sed vt apertè inefficacia huius argumenti perci
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piatur, poſſumus ijſdem ferè verbis oſtendere falſum
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eſſe, quòd à leuitate poſitiua lignum ſursùm impel
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latur, ait enim
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type
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ſaltum dependere non poſſe ab extruſione
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aquæ ambientis, quia aqua non potest illud vltrà trude
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re, quàm ſit ipſi opus, vt locum inferiorem occupet.
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type
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</
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<
s
id
="
s.000837
"> Di
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cam ego eodem modo contra leuitatem poſitiuam,
<
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quod non deberet eius leuitas propellere
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expan
abbr
="
lignũ
">lignum</
expan
>
plùs,
<
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/>
quàm requirit recta diſpoſitio, & conſtitutio natura
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lis, quia nempè (ſubijciam) non poteſt leuitas
<
expan
abbr
="
lignũ
">lignum</
expan
>
<
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/>
vltrà ſubleuare, quàm ſit ipſi opus vt locum ſuperi
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/>
orem in aqua occupet, cùm ſit nempè leuitas nullą
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alia de cauſa ligno communicata ab ipſa natura, niſi
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vt vna pars ligni demerſa ſubſidat, altera verò ſupra
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eam in aere emineat, non verò vt lignum integrum̨
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extra aquam collocetin ipſo nempè aere. </
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<
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">igitur con
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cedat aduerſarius neceſsè eſt non expulſum fuiſſe li
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gnum ſursùm à leuitate poſitiua ſupra
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abbr
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ſupremã
">ſupremam</
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aquæ
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libellam, & hinc planè conijciet ſui argumenti inef
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ficaciam. </
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Retorquetur
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idipſum ar
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gumentum
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contra ad
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uerſarium. </
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<
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">Proſequitur deindè:
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quando cylindrus erat in fundo
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noõ
">non </
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poteſt inueniri, quæ pars aquæ illum ſursùm trudat non illa,
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quæ in fundo, ſuppono enim perfectum cylindrum phyſicè,
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& fundum vaſis exactè
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abbr
="
planũ
">planum</
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>
adeò vt nulla ſenſibilis pars
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aquæ interlabi posſit quamdiù cylinder vi detinetur ibi.
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