Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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<
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<
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pagenum
="
413
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xlink:href
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026/01/447.jpg
"/>
enim iactum illum, qui fit pede miniſtro, cuius eadem eſt ratio, quæ
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brachij. </
s
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</
p
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<
p
id
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N28FF0
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type
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main
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<
s
id
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N28FF2
">Secundò, iactu lapidis maioris, maior ictus infligitur; </
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>
<
s
id
="
N28FF6
">ratio eſt, quia
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diutiùs manet lapis applicatus potentiæ, ipſique adeo corpori, in quod
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impingitur; </
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>
<
s
id
="
N28FFE
">vtrumque certè, quia tardiùs mouetur, ergo tardiùs ſepara
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tur à manu; ergo etiam inſtans contactus maius eſt. </
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</
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<
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id
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type
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<
s
id
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N29006
">Tertiò, hinc proportio ictuum ſatis facilè ex dictis ſuprà determinari
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poteſt; </
s
>
<
s
id
="
N2900C
">ſi enim habeatur tantùm ratio impetus maioris, qui imprimitur
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lb
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ſaxo ab ipſa potentia, ictus ſunt in ratione ſubduplicata ponderum, id
<
lb
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eſt, vt tempora, quibus ſaxum adhæret manui; </
s
>
<
s
id
="
N29014
">ſi verò habeatur ratio
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lb
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contactus, ictus ſunt vt motus permutando, ſuppoſito æquali impetu; </
s
>
<
s
id
="
N2901A
">
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igitur, ſi habeatur ratio vtriuſque, ictus ſunt in ratione compoſita ex ra
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lb
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tione ſubduplicata ponderum, & ratione permutata motuum v. g. ſint
<
lb
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ſaxa AB ſit A 4.librarum, B vnius; </
s
>
<
s
id
="
N29027
">ratio ſubduplicata eſt 2/1 motus A eſt
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vt velocitas; </
s
>
<
s
id
="
N2902D
">igitur eſt ad motum B, vt 1/2. permutetur, erit 2/1 componatur
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vtraque ratio, eritque ratio 4/1; </
s
>
<
s
id
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N29033
">igitur ictus lapidis ſunt vt pondera; quæ
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omnia conſtant ex dictis ſuprà. </
s
>
</
p
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<
p
id
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N29039
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type
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main
">
<
s
id
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N2903B
">Quartò, leuiſſimi lapides vix iaciuntur ad modicam diſtantiam v. g.
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lb
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granula ſabuli; ratio eſt, 1°. </
s
>
<
s
id
="
N29044
">quia accipiunt minùs impetus, quia citiùs
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ſeparantur à iaciente manu, vt patet. </
s
>
<
s
id
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N29049
">2°. </
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<
s
id
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N2904C
">quia mouetur initio velociùs in
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aëre; </
s
>
<
s
id
="
N29053
">igitur ſingulis inſtantibus plùs impetus deſtruitur, vt conſtat; nam
<
lb
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in maiori ſpatio aëris eſt maior reſiſtentia. </
s
>
<
s
id
="
N29059
">3°.quia cùm aër perpetuo
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motu agitetur, vt certum eſt, in leuiori corpore impetum imprimit; igi
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tur aliam ſiſtit vel deflectit. </
s
>
<
s
id
="
N29061
">4°.quia manu non poteſt rectè prehendi ia
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lb
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ciendus lapillus &c. </
s
>
</
p
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<
p
id
="
N29066
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type
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<
s
id
="
N29068
">Quintò, grauior lapis ad modicam tantùm diſtantiam iacitur; ratio
<
lb
/>
eſt 1°.quia producitur remiſſior impetus, cùm ſcilicet pluribus partibus
<
lb
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ſubiecti diſtribuatur. </
s
>
<
s
id
="
N29070
">2°.quia impetus grauitationis citiùs deſtruit impe
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tum extrinſecus aduenientem. </
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>
</
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<
p
id
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type
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<
s
id
="
N29077
">Sextò, figura corporis iacti multùm confert ad iactum, quia ratione
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lb
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figuræ poteſt aër plùs, vel minùs reſiſtere: </
s
>
<
s
id
="
N2907D
">hinc figura circularis depreſ
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ſior aptiſſima eſt ad iactum; </
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>
<
s
id
="
N29083
">quia minor eſt aëris reſiſtentia, qualis eſt
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figura lenticularis: </
s
>
<
s
id
="
N29089
">hinc ſcabri corporis, qualis eſt tophus, iactus eſt
<
lb
/>
difficilior; </
s
>
<
s
id
="
N2908F
">quia ſcilicet aër ſalebris illis, vel aſperitatibus interceptus
<
lb
/>
magis reſiſtit: hinc ſibilus propter colliſionem aëris &c. </
s
>
</
p
>
<
p
id
="
N29095
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type
="
main
">
<
s
id
="
N29097
">Septimò, iacitur lapis multis modis 1°. </
s
>
<
s
id
="
N2909A
">rotato infrà brachio extento: </
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>
<
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id
="
N2909D
">
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ſic vulgò iaciuntur grauiora ſaxa; </
s
>
<
s
id
="
N290A2
">ad iactum autem conferunt vires po
<
lb
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tentiæ, brachium longiùs, longior arcus, Tangens, per quam emittitur di
<
lb
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miſſum ſaxum, quæ debet facere cum horizontali angulum grad.45. ma
<
lb
/>
nus ſimul explicata; </
s
>
<
s
id
="
N290AC
">ſi enim vna pars ante aliam dimittatur, retinetur
<
lb
/>
iactus, vt vulgò dicitur, figura, & moles lapidis; </
s
>
<
s
id
="
N290B2
">ſi enim maior eſt, non
<
lb
/>
procul emittitur præuia brachij gyratio, quia impetus augetur: denique
<
lb
/>
impreſſus toti corpori impetus, quæ omnia mirificè maiorem iactum ef
<
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/>
ficiunt, vt conſtat ex dictis ſuprà. </
s
>
<
s
id
="
N290BD
">2°.iacitur lapis rotato quidem deorſum
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brachio, ſed non ſiue aliqua eiuſdem brachij contractione, & aliquot </
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>
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