Gassendi, Pierre
,
De motu impresso a motore translato epistulae duae
,
1642
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proinde vnquam deſineret. </
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">Et vis aliquod (quale
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certè haberi poteſt) experimentum? </
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<
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">Appende ſilo
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plumbum, lapidemve, qui in perpendiculo con
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quieſcat, ac poſteà illum prorſùm impelle; concipies
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hunc motum, ex ſe, æquabilem, perpetuumque eſſe.
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<
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">Cùm tantulam enim impreſſeris vim, vnde ſit, vt
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lapis toties excurrat, recurratque, ac excurrendo,
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recurrendóque tantum inſumat temporis? </
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ſtimaſſes profectò motum tanti corporis ex tantula
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vi tandiù duraturum. </
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<
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">Sed nempe lapidis attractio,
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quæ à Terra fit, à fi o cohibetur, ſicque lapis inter
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duas oppoſitas vireis veluti indifferens manet; vnde
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ſi illum tranſuerſùm pellas, motum imprimas, ad
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quem non habeat reſiſtentiam; ſicque, niſi aliud in
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terueniat, tueri illum conſtanter poſſit. </
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">Neque ob
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ſtat, quòd motus omninô tranſuerſus, ſiue ſecun
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dum horizontem non ſit, ſed fiat obliquè, ac ſur
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ſum; nam quia licet filum retineat, tum tamen etiam
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Terra retrahit; vt & quando Terra deorſùm redu
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cit, tunc quoque filum retinet; heinc eſt, cur facta
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iſtarum vnium oppoſitarum compenſatione, non ex
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hoc capite tollatur impreſſi motus conſtantia. </
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<
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quamuis tolli videatur æqu bilitas, quatenùs lapis in
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tranſcurſu per infimum punctum, ſiue perpendicu
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lum, celerrimè mouetur, tardiſſimè verò in aſcen
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ſus fine, & exſcenſus initio; ac proportione in cæteris
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locis; nihilominùs eaſemper æquabilitas perſeuerat,
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vt omnium excurſuum, recurſuumque durationes
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æquales ſint; hoc eſt, ſub initium ſint quidem ma
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jores, ſub finem minores: ſed non proptereà vn-</
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