Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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<
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quaſi ad inſtar cunei, quæ aliàs diuidunt; </
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<
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">tùm denique, quia eſt aliqua
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compreſſio, cuius vires certè maximæ ſunt, vt dicemus alibi: </
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<
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">Exemplum
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habes tùm in corpore duro, quale eſt vitrum, cuius modicam laminam ſi
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duriori pauimento impingas, hinc inde mille particulæ tumultuatim re
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ſilient; tùm in corpore liquido, vt in aqua, quæ etiam ad corpus durum
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alliſa in mille guttulas diſpergitur, quia eius partes facilè ſeparantur. </
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<
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Theorema
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57.
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Si vel mobile eſt mollius, vel ipſum planum, vel vtrumque, ita vt non atte
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rantur partes, ſed tantùm citra compreſſionem cedant, deſtruitur etiam multus
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impetus
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type
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; </
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<
s
id
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">ſit enim v.g.pila ex molliori cera, haud dubiè ex impactione non
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comprimitur quidem, ſed deprimitur, nec amplius figuram ſphæræ, ſed
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portionis habet: </
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<
s
id
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N20234
">in qua reuerâ depreſſione multus eſt conflictus, nec ſuf
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ficienter prima ſuperficies reſiſtit, licèt aliquid impetus deſtruat, nec
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etiam ſecunda, nec tertia, quæ tamen reſiſtunt ſemper in maiori propor
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tione; </
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>
<
s
id
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">donec tandem vel totus ictus quaſi extinguatur, vel determinatio
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prior ſuperetur; </
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<
s
id
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">ex quo ſequitur reflexio, ſed minor: </
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>
<
s
id
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">porrò minor refle
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xio reſultat ex mollitie mobilis, quam plani, cæteris paribus, & minor
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adhuc ex mollitie vtriuſque; in quo verò conſiſtat mollities corpo
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rum, & quomodo deprimantur ſine compreſſione, explicabimus tra
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ctatu ſequenti. </
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Theorema
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58.
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Hinc plumbum ad reflexionem minùs aptum eſt,
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quia ſcilicet eius partes
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difficiliùs auelluntur, & à maiore ictu, qui ex grauitate maiore reſultat,
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faciliùs deprimuntur; </
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>
<
s
id
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">hinc cum in molliorem terram pila alliditur, quaſi
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emoritur eius ſaltus; </
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<
s
id
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">hinc, ſi grauior ictus eſt, qualis eſt maioris vel mi
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noris pilæ è tormento exploſæ, & mollior terra, qualis eſt illa quâ vulgò
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aggeres munitionum farciuntur, pila terram ipſam facto foramine pene
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trat, cùm facilè cedat materia; nec inde amplius reſultat, cuius rei ratio
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eſt clariſſima quia ſenſim extinguitur impetus, nec anguſtiæ foraminis
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reditum patiuntur. </
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</
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<
s
id
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">Hinc multâ lanâ muniuntur latera nauium contra maiora tormenta; </
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quippe globi vis ſenſim emoritur in lana, quia ſinguli pili reſiſtunt; &
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quia facilè cedunt difficiliùs diuiduntur, ſed fallenti illa ceſſione ictum
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quoque fallunt, in quo non eſt difficultas. </
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Theorema
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59.
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Quando fit aliqua compreſſio, distribuitur etiam impetus
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; </
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<
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">eſt enim con
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flictus, & pugna partium inter ſe; </
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<
s
id
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N202B3
">ſit enim veſicca in pauimentum alli
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ſa, partes anticæ aëris, quo veſicca inflatur, comprimunt, & quaſi poſti
<
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cas repellunt, à quibus mutuò retruduntur; </
s
>
<
s
id
="
N202BB
">vides pugnam; </
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>
<
s
id
="
N202BF
">igitur de
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ſtruitur impetus: </
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>
<
s
id
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N202C5
">ſed reſtituitur ſtatim à potentia motrice media, quâ
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ſcilicet corpus omne compreſſum plùs æquo, vt ſeſe in priſtinum exten
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ſionis ſtatum reſtituat, producit in ſe impetum: porrò de hac potentiâ </
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