Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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Definitio III.
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Impetus eſt qualitas exigens motum, ſeu fluxum localem ſui ſubiecti, vel
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qua est cauſa proxima motus illius mobilis, cui ineſt, eo ſcilicet modo, quo
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poteſt eſſe cauſa motus.
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<
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id
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">Dico eſſe qualitatem ſiue diſtincta ſit, ſiue non diſtincta; </
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<
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">quod hîc
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certè non diſcutio; </
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<
s
id
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">nec enim affirmo in hac definitione dari impetum; </
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ſed definio tantùm quid ſit impetus; </
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">qui reuera aliud non eſt, ſi eſt: </
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quippe id tantùm concipio, cum impetum appello; </
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<
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ne quis fortè initio ſtatim mihi litem intendat; </
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<
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circulum Geometra; </
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<
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<
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">ita Phy
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ſicus definit impetum, quamuis non affirmet dari impetum; </
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">quod tamen
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in ſexto Theoremate demonſtrabimus; </
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<
s
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">itaque ſi eſt impetus, haud dubiè
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nihil omninò præſtat in ſuo ſubiecto niſi motum; quod quomodò fiat,
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explicabimus intrà in Theorematis. </
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Hypotheſis I.
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Datur motus localis
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; </
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">quis enim non videt volantem auem, natantem
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piſcem; currentem equum, rotatum globum; denique vnum corpus mi
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grans è loco in locum? </
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<
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">ſed hoc eſt moueri per Def. 1. igitur infinitis fe
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rè experimentis nititur hæc hypotheſis, quam veram eſſe neceſſe eſt, ſi
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illa vera ſunt; ſed illa certa ſunt phyſicè, neque citra miraculum fallere
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poſſunt. </
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<
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id
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">Diceret fortè aliquis etiam motum ſubeſſe oculorum fallaciæ; cùm è
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naui mobili littus ipſum moueri, ipſumque nauigium non moueri iudi
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cemus. </
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<
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">Quis enim oculos in Solem intendens, primo intuitu Solem ſta
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re non iudicet? </
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<
s
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">cum tamen deinde perniciſſimo curſu rotari demonſtre
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mus; </
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">adde alias oculorum fallacias circa motum; </
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">ſic rotata ſcintilla, vel
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carbo accenſus immotum orbem deſcribere videtur; </
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">ſic nota inuſta
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trocho, dum celerrimè rotatur, orbem etiam immobilem deſcribere iu
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dicatur; </
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<
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id
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">ſic ſtella cadens, vel exhalatio continenti ſucceſſione accenſa
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moueri videtur; </
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<
s
id
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">licet minimè moueatur; </
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<
s
id
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">idem dicendum de puluere
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tormentario, vel alia qualibet materia; quæ continuata conſecutione
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accenditur; </
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<
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id
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">immò trochus ipſe in orbem celerrimè agitatus, quieſcere
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videtur; </
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<
s
id
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">ſic qui vertigine laborant, ea moueri exiſtimant, quæ quieſcunt; </
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idem exemplum habemus in ebrioſis, iracundis, in iis qui ex graui febris
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ardore delirant, & in pueris qui diu in gyros eunt, vbi verti deſierint; </
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ſic eorum quæ motu æquali feruntur, remotiora tardiùs moueri viden
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tur; </
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<
s
id
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">immò ſi per eandem lineam oculus, & mobile pari velocitate ince
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dant, ipſum mobile quieſcere videtur, plura leges apud Opticos, de
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quibus agemus ſuo loco: Igitur ex his omnibus conſtat minimè conſta
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re dari motum, ex eo quòd oculis aliquid moueri videatur. </
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<
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">Reſpondeo equidem fateri me, viſum ipſum plurimis ſubeſſe fraudi
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bus; </
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<
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id
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">attamen ſi rectè oculus admoueatur, iuſta diſtantià, nec vllum ſit
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impedimentum exterius nec interius; </
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<
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tum obſeruet; an fortè currentis calami motus oculum meum fallere po-</
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