Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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dum eſt, Dico igitur tertio loco, in tantum corpus vnum ab alio moveri,
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præſcindendo à magneticis, & electricis, in quantum illud aliquem mo
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tum impedit; ſi enim id quod movetur nullo modo ab alio impeditur,
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nullam vim prorſus contra illud retorquet; & hoc nemo negaverit, qui hu
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ius doctrinæ peritus ſit; ſic directus ictus vegetior eſt, obliquus verò debi
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lior; in globulis, qui adhiberi ſolent in ludo minoris tudiculæ, res eſt om
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nino perſpicua. </
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Auguſtin.
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<
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"> Videtur eſſe quoddam paradoxum, quod dicis cauſam ſcilicet
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potentiùs agere, quando magis impeditur, erit fortè quædam antiperiſtaſis;
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ſic ignis
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calidior eſt. </
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Antim.
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<
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"> Ita eſt, paradoxum eſſe videtur; ſi quis tamen rectè perpendat,
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impetum eum dumtaxat finem, vel effectum habere, ac præſtare immo
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bili, cui ineſt, vt hoc moveatur, tali ſcilicet motu & modo, qui offectus
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ſi non impeditur ab alio. </
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<
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id
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">fruſtra certè contra illud vim ſuam exerit, ſi v.
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g. corpori dum movetur, à tergo manum admoveas, aut certè à frontè, ea
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ea tamen lege, vt manum admotam æquè citò moveas, nullam
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vim, nullum impetum manui tuæ imprimi ſenties; quia hæc nullo modo
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impedit illius corporis motum; ſi verò mobile in aliud corpus impinga
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tur, quod motui obeſt, in illud agit, impreſſoque impetu, illud amovet, vnde,
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vt dixi, finis primarius impetus eſt mobilis, cui ineſt, motus; ſecundarius
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verò, & quem dumtaxat propter primum ponit, eſt motus alterius cor
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poris, quod dictum motum impedit; nec mirum, ſi impetus alium impetum
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producit, in eo ſcilicet, quod proprij mobilis motum impedit: Hinc ſi Phi
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loſopho in verbis ludere liceret, dici à me poſſet
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impetus,
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quaſi
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impedi
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tur,
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cùm nunquam agat, & ſuam vim exerat, niſi impediatur. </
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<
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">His præ
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miſſis, ad rem venio, Auguſtine; Repetamus figuram Sextam, & primo
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quidem loco vnum dicam, quod vix apud vos fidem inveniat, licèt cer
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tiſſimum ſit, geometrica ſcilicet demonſtratione confirmatum; illud
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autem ad incredibilem proportionem inæqualitatis motus rotæ, in
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diverſis illius punctis conſiderati pertinet; dico iterum incredi
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bilem. </
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Chryſoc.
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locaris, Antime: quis Auriga, Rhedarius, Carpentarius hoc
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neſcit? </
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<
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">quis oculos figens non videt, ſuperius rotæ punctum à plano, in
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quo rota volvitur, tota rotæ diametro diſtans, velociùs agi, quàm infimum,
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in quo ſcilicet rota planum tangit. </
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Antim.
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<
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"> Serio loquor, Chryſocome, non iocor; vident omnes eſſe quidem
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inæquales motus, ſed nemo crederet tantam inæqualitatis propor
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tionem. </
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Auguſt.
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<
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"> Quanta porrò illa erit? </
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<
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duplo citiùs infimo, aut etiam triplo, quadruplo, decuplo, vt voles; quid
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tandem erit? </
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videbis paulò poſt; ſed amabo te, Auguſtine, cogita maximam
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quam potes proportionem inæqualitatis; & videbis vtrùm illa, quam eſſe
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conſtat in rigore geometrico, ſit incredibilis. </
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Auguſtin.
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<
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"> Si centuplam eſſe dixero, vera haud dubiè longè maior erit, & </
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