Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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N270EE
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<
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pagenum
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410
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xlink:href
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026/01/444.jpg
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tiò, aliquando primæ tantùm ſuperficies extenduntur, vt videmus in
<
lb
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capite, ſeu baſi cuneorum; quia materies durior multùm reſiſtit. </
s
>
<
s
id
="
N28D4B
">Quartò,
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lb
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limbus baſis dilatatæ contrahitur deinde, ſeu retorquetur deorſum; </
s
>
<
s
id
="
N28D51
">quia
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lb
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cùm interiores circuli dilatentur, deberet facere limbus ille maiorem
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circulum; quod cùm fieri non poſſit, contrahitur ſeu incuruatur deor
<
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ſum, quod facilè ſine figura intelligi poteſt. </
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>
<
s
id
="
N28D5B
">Quintò, poteſt deter
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minari proportio ictuum, quibus deprimuntur cylindri; </
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>
<
s
id
="
N28D61
">ſi enim ſup
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lb
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ponatur eadem altitudo, ſeu linea depreſſionis, & diuerſa craſſi
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lb
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tudo cylindrorum ictus, erunt vt baſes; </
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>
<
s
id
="
N28D69
">nam quò plures partes de
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primendæ ſunt, maiore ictu opus eſt, ſi opponatur eadem craſſitudo
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lb
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vtriuſque cylindri ſed diuerſa depreſſionis linea vel altitudo, ictus
<
lb
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erunt vt altitudines; </
s
>
<
s
id
="
N28D73
">ſi vtraque ſupponitur diuerſa, ictus erunt in ra
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tione compoſita ex ratione baſium, & altitudinum; quæ omnia conſtant
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ex dictis. </
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>
</
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<
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type
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<
s
id
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N28D7D
">Obſeruabis tamen creſcere reſiſtentiam ex duplici capite. </
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>
<
s
id
="
N28D80
">Primò,
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lb
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ex eo quod aliquæ vacuitates occupentur à partibus depreſſis, ac proin
<
lb
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de cylindrus induretur; ſic intus durior euadit ſub malleo, & & pila
<
lb
/>
lignea ſub ictibus. </
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>
<
s
id
="
N28D8A
">Secundò, latiorem illam ſuperficiem impedire di
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lb
/>
latationem aliarum partium: </
s
>
<
s
id
="
N28D90
">hinc variè diſcerpitur eius limbus, vt
<
lb
/>
videre eſt in cuneo ferreo: </
s
>
<
s
id
="
N28D96
">atqui in explicandis ſuprà ictuum propor
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lb
/>
tionibus, hoc geminum reſiſtentiæ caput nullo modo conſiderauimus: </
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>
<
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id
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N28D9C
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ſextò, quærunt aliqui dato ictu, quo deprimitur cylindrus data alti
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tudine, quantum pondus eſſe debeat, quod ſua grauitatione eum
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/>
dem præſtet effectum; ſed profectò id nemo vnquam determinauit,
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niſi primò inueniat pondus, cuius caſu prædictus cylindrus eodem
<
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modo deprimatur. </
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>
<
s
id
="
N28DA9
">Secundò, niſi ſciat quot inſtantibus deſcendat, vt
<
lb
/>
patet ex his quæ diximus ſuprà; vt autem comparetur ictus inflictus
<
lb
/>
à brachio cum ictu inflicto à pondere cadente, debet conſuli diuerſa
<
lb
/>
depreſſio, vel defixio. </
s
>
</
p
>
<
p
id
="
N28DB3
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type
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">
<
s
id
="
N28DB5
">Vigeſimoqnartò, corpus cadens in planum horizontale per lineam
<
lb
/>
perpendicularem, maximum ictum infligit: </
s
>
<
s
id
="
N28DBB
">maiorem, cum cadit in pla
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lb
/>
num decliue, quod manifeſtum eſt; </
s
>
<
s
id
="
N28DC1
">poteſt autem determinari propor
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lb
/>
tio ictuum ratione planorum; </
s
>
<
s
id
="
N28DC7
">ſit enim perpendicularis KN cadens in
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lb
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planum horizontale AD, erit maximus ictus; </
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>
<
s
id
="
N28DCD
">ſit vt AD; </
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>
<
s
id
="
N28DD1
">fiat quadrans
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ADG: </
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>
<
s
id
="
N28DD7
">ſit planum decliue AE, in quod cadit KM; </
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>
<
s
id
="
N28DDB
">ducatur EC vel
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EI; </
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>
<
s
id
="
N28DE1
">primus ictus eſt ad ſecundum, vt AD ad AC vel IE; </
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>
<
s
id
="
N28DE5
">ſit aliud
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planum decliue AF, in quod cadit KN; </
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>
<
s
id
="
N28DEB
">ducantur FBFH, primus eſt
<
lb
/>
ad tertium, vt AD ad AB; patet ex dictis ſuprà, cum de planis in
<
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/>
clinatis. </
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>
</
p
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<
p
id
="
N28DF3
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type
="
main
">
<
s
id
="
N28DF5
">Vigeſimoquintò, ſi verò cadat corpus graue in globum, aſſumenda eſt
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lb
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Tangens puncti contactus v. g. ſit globus centro A ſit corpus cadens
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per FD; </
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<
s
id
="
N28E01
">ſit punctum contactus D; </
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<
s
id
="
N28E05
">ſit Tangens CE; </
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>
<
s
id
="
N28E09
">idem eſt ictus,
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qui eſſet, ſi corpus graue caderet in planum inclinatum CE; </
s
>
<
s
id
="
N28E0F
">ſi verò
<
lb
/>
globus cadat in aliud corpus v. g. globus A in corpus HG
<
lb
/>
per lineam RG; </
s
>
<
s
id
="
N28E1B
">ducatur AG, tùm GS, ictus in G eſt ad ictum </
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>
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</
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</
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