Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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<
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uetur à perpendiculari: </
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<
s
id
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N20C68
">An fortè etiam ex hoc phænomeno duci poteſt
<
lb
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vera menſura, ſeu regula refractionum, quod ingenioſiſſimè excogitauit
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vir illuſtris Renatus Deſcartes in ſua Dioptrica; </
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<
s
id
="
N20C70
">ſed diſcrimen maximum
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lb
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eſt, quòd luminis diffuſio ſeu propagatio nullum dicat motum localem,
<
lb
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vt ſuo loco demonſtrabimus; </
s
>
<
s
id
="
N20C78
">quippe lumen qualitas eſt, vt impetus; quod
<
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tamen ad rem præſentem nihil prorſus facit. </
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<
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Theorema
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86.
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<
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Linea refractionis motus non eſt recta (ſic eam deinceps appellabimus.)
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emph.end
type
="
italics
"/>
<
lb
/>
<
expan
abbr
="
Cũ
">Cum</
expan
>
enim ideo deflectat à recta HD, quia
<
expan
abbr
="
planũ
">planum</
expan
>
in H reſiſtit motui globi;
<
lb
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igitur etiam in K deflectet à recta KE, quia etiam medium in K reſiſtit. </
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>
</
p
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<
p
id
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N20CA1
"
type
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">
<
s
id
="
N20CA3
">Obſeruabis tamen primò, vix hoc diſcerni poſſe, niſi ſit maxima vis
<
lb
/>
motus; </
s
>
<
s
id
="
N20CA9
">quippe grauitas corporis defert corpus deorſum; vnde vis illa
<
lb
/>
grauitationis impedit, ne corpus reflectat ſeu reſiliat ſurſum Secundò, ſi
<
lb
/>
corpus in aquam projectum ſit leuius aqua, non modò hæc refractio ſen
<
lb
/>
ſibilis eſt, verùm etiam illa perpetua refractionum ſeries, quia aqua ſem
<
lb
/>
per attollit ſurſum corpus leuius. </
s
>
<
s
id
="
N20CB5
">Tertiò, in corpore oblongo hoc expe
<
lb
/>
rimentum maximè probatur, quia plures partes aquæ ſimul reflectunt. </
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>
</
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type
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<
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id
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<
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type
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Theorema
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emph.end
type
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"/>
87.
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</
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<
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Linea motus refracti non eſt recta,
<
emph.end
type
="
italics
"/>
prob. </
s
>
<
s
id
="
N20CD2
">quia cum in ſingulis punctis
<
lb
/>
aquæ ferè mutetur, curuam eſſe neceſſe eſt. </
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>
</
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<
p
id
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type
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<
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id
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<
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type
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<
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type
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Theorema
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emph.end
type
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88.
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type
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</
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</
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<
s
id
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">
<
emph
type
="
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"/>
Hinc optima ratio ducitur, cur globus ex tormento excuſſus ad angulum
<
lb
/>
incidentiæ valdè acutum ſuperficiem aquæ penetret
<
emph.end
type
="
italics
"/>
; </
s
>
<
s
id
="
N20CF2
">ex qua denuò emergit
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lb
/>
quaſi per arcum primum deorſum; </
s
>
<
s
id
="
N20CF8
">tùm demum ſurſum inflexum immò
<
lb
/>
plures accidunt huiuſmodi repetitæ emerſiones: </
s
>
<
s
id
="
N20CFE
">hinc valdè falluntur,
<
lb
/>
qui credunt ab ipſo fundo maris globum repercuti; quod pluſquàm ri
<
lb
/>
diculum eſt; hoc quoque
<
expan
abbr
="
experimentũ
">experimentum</
expan
>
in projectis ſaxis ſæpiùs obſeruaui. </
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>
</
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<
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<
emph
type
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"/>
<
emph
type
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Theorema
<
emph.end
type
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"/>
89.
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type
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</
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</
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<
s
id
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<
emph
type
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"/>
Hinc cum ſaxa planiora ſunt in medio aëre ſimile obſeruari poteſt experi
<
lb
/>
mentum
<
emph.end
type
="
italics
"/>
; </
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>
<
s
id
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N20D25
">nam poſt aliquem deſcenſum iterum aſcendit ſaxum; nec eſt
<
lb
/>
quod aliquis vento flanti cauſam huius effectus tribuat, qui ſemper acci
<
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/>
dit etiam valdè ſereno cœlo. </
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>
</
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<
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<
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<
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Theorema
<
emph.end
type
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90.
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type
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</
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</
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<
p
id
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type
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">
<
s
id
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N20D3D
">
<
emph
type
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"/>
Hinc cauſa euidens illius aſcenſus ſagittæ quamtumuis per lineam horizon
<
lb
/>
ti parallelam emitatur
<
emph.end
type
="
italics
"/>
; </
s
>
<
s
id
="
N20D48
">quippè ab aëre inferiori quaſi repercutitur, ali
<
lb
/>
quid ſimile coniicio in glandibus ex tormento exploſis; </
s
>
<
s
id
="
N20D4E
">eſt enim aliquis
<
lb
/>
quamuis inſenſibilis aſcenſus; </
s
>
<
s
id
="
N20D54
">hinc fortè ratio, cur in ſcopum lineas di
<
lb
/>
rectionis horizonti parallelæ reſpondentem globus incidat, cùm infra
<
lb
/>
ſcopum cadere deberet, vt reuerâ fit in notabili diſtantia propter mo
<
lb
/>
tum mixtum; </
s
>
<
s
id
="
N20D5E
">exemplum huius effectus clariſſimum video in illis auicu
<
lb
/>
lis, quæ per ſaltus, vel arcus huiuſmodi volant; primò enim deſcendere
<
lb
/>
videntur, ſed vix aſcendunt. </
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>
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