Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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<
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<
front
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<
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<
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tur per horizontalem, quæ conueniat cum eadem linea directionis,
<
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iactus eſt longior toto illo ſpatio, quod nauis decurrit, dum iactus
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durat; </
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>
<
s
id
="
N10A6E
">breuior tamen, ſi in partem oppoſitam fiat iactus in hoc ca
<
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ſu, ſi nauis æqualem impetum imprimeret, deorſum rectà ferretur
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mobile motu naturali; </
s
>
<
s
id
="
N10A76
">imò ſagitta poſſet retorqueri in iaculatorem: </
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>
<
s
id
="
N10A7A
">
<
lb
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ſi terra eſſet vtrimque peruia, lapis demiſſus per multa annorum
<
lb
/>
millia libraretur; non tamen eſſet motuus perpetuus. </
s
>
</
p
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<
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id
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<
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De motu reflexo.
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</
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<
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<
s
id
="
N10A95
">1. MOtus reflexi vera cauſa eſt impetus prior, ad nouam li
<
lb
/>
neam determinatus ab occurrente obice; </
s
>
<
s
id
="
N10A9B
">planum refle
<
lb
/>
ctens eſt cauſa nouæ determinationis ſuo modo; </
s
>
<
s
id
="
N10AA1
">cauſam enim di
<
lb
/>
co eam, ex qua aliquid ſequitur: </
s
>
<
s
id
="
N10AA7
">ex gemina determinatione, noua,
<
lb
/>
ſcilicet, per ipſam perpendicularem erectam in puncto contactus,
<
lb
/>
& priore per lineam incidentiæ, ab eodem puncto contactus pro
<
lb
/>
pagatam, fit determinatio mixta per lineam reflexionis; </
s
>
<
s
id
="
N10AB1
">quæ omnia
<
lb
/>
patent ex terminis: </
s
>
<
s
id
="
N10AB7
">hinc nullus impetus producitur à plano refle
<
lb
/>
ctente; </
s
>
<
s
id
="
N10ABD
">quippe prior poteſt determinari ad nouam lineam: adde,
<
lb
/>
quòd planum, quod caret impetu, impetum producere non poteſt. </
s
>
</
p
>
<
p
id
="
N10AC3
"
type
="
main
">
<
s
id
="
N10AC5
">2. Imò nihil impetus deſtruitur in reflexione pura per ſe; </
s
>
<
s
id
="
N10AC9
">quia ni
<
lb
/>
hil impetus eſt fruſtrà per ſe in pura reflexione; </
s
>
<
s
id
="
N10ACF
">multus tamen im
<
lb
/>
petus deſtruitur per accidens, tùm ab ipſo attritu tùm mollitie
<
lb
/>
& ceſſione, tùm preſſione: </
s
>
<
s
id
="
N10AD7
">hinc ſuppoſito eodem iactu, perpendi
<
lb
/>
cularis reflexa eſt omnium reflexarum minima; </
s
>
<
s
id
="
N10ADD
">quia per eam li
<
lb
/>
neam maximus ictus infligitur; </
s
>
<
s
id
="
N10AE3
">igitur maxima eſt partium colliſio,
<
lb
/>
& preſſio: hinc etiam corpora duriora longiùs reflectuntur, per ipſam
<
lb
/>
quoque
<
expan
abbr
="
perpendicularẽ
">perpendicularem</
expan
>
, dum planum reflectens ſit æquè durum. </
s
>
</
p
>
<
p
id
="
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"
type
="
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">
<
s
id
="
N10AF1
">3. Determinatio noua dupla eſt prioris, poſita linea incidentiæ
<
lb
/>
perpendiculari, & poſito etiam plano reflectente immobili; </
s
>
<
s
id
="
N10AF7
">quia
<
lb
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alioquin anguli reflexionis non eſſent æquales angulis incidentiæ: </
s
>
<
s
id
="
N10AFD
">
<
lb
/>
ſi globus reflectens ſit æqualis impacto, æqualis eſt ceſſio reſiſtenciæ
<
lb
/>
cùm ſit æquale agens reſiſtenti, perid enim reflectens reſiſtit, per
<
lb
/>
quod eſt: </
s
>
<
s
id
="
N10B06
">igitur, ſi æqualis reſiſtit, & cedit, certè æqualiter ce
<
lb
/>
dit, & reſiſtit: </
s
>
<
s
id
="
N10B0C
">hinc noua determinatio æqualis eſt priori: </
s
>
<
s
id
="
N10B10
">hinc glo
<
lb
/>
bus impactis ſiſtit immobilis; quia ex duabus determinationibus
<
lb
/>
oppoſitis neutra præualet. </
s
>
</
p
>
</
section
>
</
front
>
</
text
>
</
archimedes
>