Gassendi, Pierre
,
De proportione qua gravia decidentia accelerantur
,
1646
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cium: eo modo, quo agnoſcere non licet corpus ali
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quod frigefacere, quando calor eſt ita potentior fri
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gore, vt ſolus ipſius effectus ſentiatur. </
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<
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">Sic non eſt
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quare iam excuſes non poſſe globum ferreum ex Luna
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eadentem moueri tam perniciter, quàm prædixeris,
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ob conditionem medij, cùm reſiſtentia ſit ſemper ipſa
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impulſione futura minor. </
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<
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id
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">Et quod ais
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aërem demùm
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neque tam celeriter diuidi, neque tam citò rarefieri, &
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accurrere ad replendum vacuum naturaliter poſſe:
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idipſum
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probat non minorem in reſiſtendo,
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quã
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in accurren do
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vim eſſe; cùm & vacuum ex eo metuendum à tergo
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non ſit, quòd non aër immediate antrorsùm pulſus ille
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ſit, qui retrorsùm concluditur, verùm ille, qui priùs
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ad latera pulſus, & à ſuccedente compulſus, eò iam ac
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ceſſit. </
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<
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id
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">Ex his itaque, aliiſque id genus argumentis
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fieri videtur, vt aër à tergo accurrens minùs poſſit ad
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compellendum, quàm occurrens à fronte ad reſiſten
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dum: aut ſaltem, vt compenſatio fiat, & dici ad ſum
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mum valeat, tantum aërem à tergo concluſum ad pel
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lendum iuuare, quantum à fronte diuiſum ad proce
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dendum reſiſtere. </
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<
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id
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">Vnde & efficiatur, vt aër non mo
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dò non ſola, ſed ne vlla quidem cauſſa ſit accelera
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tionis. </
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<
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id
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">De Grauitate verò, quod ſit qualitas inſita, & ab
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attractione diſtincta, cuius effectus ſit motus deorsùm,
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& ille quidem aëre, alióve quovis medio ſecluſo, ſem
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per idem, ſimiliſve ſui, aut æquabilis, videtur mihi dici
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non poſſe. </
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<
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id
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">Ac vt illa quidem præteream, quæ mox
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ſunt de aëre, & nomine aëris vniuersè de medio dicta;
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dicamus igitur de vacuo, in quo ais
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grauiũ
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deſcenſum </
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