Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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turali, vt ſuprà demonſtrauimus; </
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<
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">imò ſi creſceret vt vult Galileus, ictus;
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haud dubiè eſſet maior in fine motus quàm initio, quod omninò expe
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rientiæ repugnat. </
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<
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">Nec eſt quod aliquis dicat glandem emiſſam per horizontalem tan
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tillùm aſcendere; </
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<
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id
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">vnde plus temporis in aſcenſu ſimul & deſcenſu col
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locatur, quàm in ſolo deſcenſu; </
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<
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id
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">nam primò vix hoc aliquis ſibi perſua
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ſerit, cùm experimento percipi non poſſit; </
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<
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id
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">Secundò licèt verum eſſet,
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non tamen eſt tantus aſcenſus, quin adhuc plùs temporis ponat in aſ
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cenſu, atqué in deſcenſu, quàm in altiſſima perpendiculari quadruplæ al
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titudinis, vt conſtat; </
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<
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id
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">ſit enim horizontalis AF, diſtans à plano hori
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zontali altitudine BA; </
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<
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">ſit tormentum directum per lineam AF, & glo
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bus percurrat lineam curuam AEF, idque ſpatio 8.ſecundorum minu
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torum; </
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<
s
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">ſitque DE 3. pedum; </
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<
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">certè eo tempore quo conficit AE, ſi in
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perpendiculari conficiat ED, cum ED conficiat tempore 30tʹ; </
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<
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">haud
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dubiè AE eodem tempore conficere deberet; </
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<
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id
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">ſed conficit AE tempore
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4. ſecundorum, vt conſtat ex ipſis multorum obſeruationibus; </
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<
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">igitur to
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tam AEF deberet percurrere tempore 1″, id eſt eo tempore quo in per
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pendiculari deorſum percurruntur 12. pedes; </
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<
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">denique ſi verum ſit glo
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bum aſcendere tantillùm dum emittitur è tormento horizonti paralle
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lo; </
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<
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id
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">crediderim id eſſe tùm ex aliqua repercuſſione aëris, tùm eo quod à
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flamma ſurſum aſcendente ſurſum etiam aliquantulum inclinetur; </
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<
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verò ſpectat ad ſagittam, alia cauſa non eſt niſi modica aëris repercuſſio; </
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eſt enim leuior ſagittæ materia; ſed de repercuſſione fusè agemus
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infrà. </
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Theorema
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47.
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Motus projecti ſurſum per inclinatam eſt mixtus
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; </
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ex naturali, & violenti; qui cùm non ſint in oppoſitis lineis, ad commu
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nem motum concurrunt, vt patet. </
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Theorema
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48.
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Non eſt mixtus ex vtroque æquabili
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; quia linea eſſet recta per Th.1.ſed
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linea huius motus eſt curua per hyp. </
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<
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">non pertinet etiam hic motus ad
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ſecundam combinationem de qua Th. 30. nec ad quintam, nec ad
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octauam, nec ad nonam, de aliis videbimus infrà. </
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Theorema
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49.
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Non eſt mixtus ex naturali accelerato, & violento æquabili
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; </
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<
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">probatur,
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quia in fine motus eſſet maior impetus, igitur eſſet maior ictus contra ex
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perientiam; </
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<
s
id
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">imò longè maior quàm ſi mobile proiiceretur per horizon
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talem, quia diutiùs durat ille motus; </
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<
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">igitur plures gradus impetus na
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turalis acquiruntur; </
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<
s
id
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">igitur longè maior eſt ictus; prætereà ſi impetus
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naturalis deſtruit impetum ſurſum in verticali, cur non in inclinata? </
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<
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eſt eadem omninò ratio; </
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<
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">quippe ideò deſtruitur in verticali, quia cor
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pus graue ſurſum attollitur; </
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<
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id
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">cùm tamen ſua ſponte deorſum ferri debe
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ret; </
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<
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id
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">ſed non minùs, cùm per inclinatam ſurſum proiicitur, remouetur à </
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