Gassendi, Pierre
,
De proportione qua gravia decidentia accelerantur
,
1646
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quàm verſus aliam regionem; ideò ratiocinatus ſum
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huiuſmodi motus principium eſſe debere vel in aëre, à
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quo quam-ptimùm lapis fuerit contactus, cœperit mo
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ueri; vel in Terra, verſus quam, non aliò inſtitutus mo
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tus fuerit; non verò in lapide ipſo, qui quandiù ſolus
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fuerit, nihilque externum ad ipſum appulerit, ipſumve
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contigerit, eo motu caruerit. </
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<
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">Rurſus autem, quia ani
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maduerti, ſi nihil vſquàm rerum eſſet, præter aërem, ac
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in aëre lapidem, non fore cur lapis in hanc potiùs par
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tem, quàm in aliam quamlibet ferretur; idcircò con
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cluſi, cùm lapis cœperit verſus
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Terrã
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ferri, debere ſaltem
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primam motus cauſſam ab ipſa Terra procedere; vnde
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& attracticem vim in ipſa Terra eſſe conceſſi. </
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<
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">Et quòd
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talis vis eſſe non poſſit procùl actuoſa, propè otioſa;
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ideò ex illius actione continente in lapidem, collegi
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eſſe neceſſarium inualeſcere impetum, ſeu accelerari in
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lapide motum. </
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<
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id
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s.001835
">Quoniam verò peruidere ſum viſus ex
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ſola hac attractione non poſſe explicari proportionem
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eiuſce accelerationis; & aliunde reputaui aërem, tamet
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ſi non poſſit fieri cauſſa initij motus, poſſe nihilomi
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nus motum ſemel cœptum iuuare, ac veluti prouchere;
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idcircò illum quoque adhibui, & ex eius vi impulſiua,
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cum attractrice terræ coniuncta compoſui cauſſam
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proportionis integram, quo legiſti modo. </
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<
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id
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s.001836
">Hæc re
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peto autem, vt tibi inſinuem, quamobrem non modò
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accelerationem, ſed ipſum quoque motum, ſiue pri
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mum initium motus, qui à te dicitur deſcenſus, eſſe à
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principio externo cenſuerim. </
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<
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<
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">Ratio aliunde mihi fuit, quòd nihil videretur
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magis conſentaneum, quàm motum foueri, incremen-</
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