Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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<
archimedes
>
<
text
>
<
front
>
<
section
>
<
p
id
="
N11086
"
type
="
main
">
<
s
id
="
N11094
">
<
pb
xlink:href
="
026/01/029.jpg
"/>
quando motus centri, & ſuprema rotæ pars in eandem partem ſe
<
lb
/>
runtur; </
s
>
<
s
id
="
N1109E
">punctum verò oppoſitum velociſſimo, quia in motu huius
<
lb
/>
rotus motus orbis additur motui centri; </
s
>
<
s
id
="
N110A4
">in motu verò illius, to
<
lb
/>
tus motus orbis, motui centri detrahitur: quod autem detrahit mo
<
lb
/>
tus orbis, nunquam æquale eſt toti motui centri. </
s
>
</
p
>
<
p
id
="
N110AC
"
type
="
main
">
<
s
id
="
N110AE
">2. Hinc omnia puncta eiuſdem circuli rotæ mobilis in plano
<
lb
/>
hoc motu mixto mouentur in æquali motu: </
s
>
<
s
id
="
N110B4
">hoc etiam motu mo
<
lb
/>
uetur globus deſcendens in plano inclinato, in quo reuerâ motu
<
lb
/>
hæc habes: </
s
>
<
s
id
="
N110BC
">primò, non modò accelerari
<
expan
abbr
="
motũ
">motum</
expan
>
centri, verùm etiam
<
lb
/>
motum orbis;
<
expan
abbr
="
ſecũdò
">ſecundò</
expan
>
, ita
<
expan
abbr
="
impetũ
">impetum</
expan
>
propagari ab intrinſeco, vt ſingu
<
lb
/>
lis partibus eiuſdem circuli, & plani in æqualiter diſtribuatur, tertiò
<
lb
/>
hoc motu motum rectum non impediri à circulari, & ſed iuuari. </
s
>
</
p
>
<
p
id
="
N110D2
"
type
="
main
">
<
s
id
="
N110D4
">3. Cùm rota voluitur in ſuperficie connexa, mouetur motu mix
<
lb
/>
to ex duobus circularibus: ſimilis eſt hic motus motui epicycli. </
s
>
<
s
id
="
N110DA
">Ca
<
lb
/>
lamus volatilis, cuius miſſio frequens, & repercuſſio, ludi non in
<
lb
/>
grati copiam facit: </
s
>
<
s
id
="
N110E2
">mouetur motu mixto ex recto, & circulari: </
s
>
<
s
id
="
N110E6
">in
<
lb
/>
hoc porrò motu præit calami caput, & ſequuntur pennæ; </
s
>
<
s
id
="
N110EC
">quia aër
<
lb
/>
fortiùs reſiſtit pennis, quàm thecæ: hinc pennarum motum theca
<
lb
/>
grauior accelerat, cuius motum pennæ retardant. </
s
>
</
p
>
<
p
id
="
N110F4
"
type
="
main
">
<
s
id
="
N110F6
">4. Hinc, ſi quando accidat, penas educi ex theca in libero medio; </
s
>
<
s
id
="
N110FA
">
<
lb
/>
ſtatim theca velociori motu mouetur, cùm tamen pennæ ipſæ ſi
<
lb
/>
ſtant: </
s
>
<
s
id
="
N11101
">ex hac inæqualitate, ne impetus ſit fruſtrà, propter detortas
<
lb
/>
in alteram partem pennas ab aëre reſiſtente totum iaculum defle
<
lb
/>
ctitur, agitúr que in orbem; hinc motus orbis traducitur ex theca in
<
lb
/>
pennas, non contrà, vt aliquis fortè exiſtimaret, licèt pennarum tar
<
lb
/>
ditas, & obliqua deflexio, ratione cuius ab aëre reſtante, in alteram
<
lb
/>
partem quaſi reflectentur, ſint neceſſaria conditio huius traductio
<
lb
/>
nis. </
s
>
</
p
>
<
p
id
="
N11111
"
type
="
main
">
<
s
id
="
N11113
">5. Hinc motu recto prædictum iaculum in vacuo tantùm mo
<
lb
/>
ueretur, vt patet: hinc: </
s
>
<
s
id
="
N11119
">cùm pennæ ſunt explicatiores, tardiùs; </
s
>
<
s
id
="
N1111D
">cùm
<
lb
/>
verò contractiores, velociùs mouetur, etiam motu orbis; </
s
>
<
s
id
="
N11123
">cui non
<
lb
/>
minùs aër reſiſtit, in pennis, ſcilicet, quàm motui axis: </
s
>
<
s
id
="
N11129
">hinc, ſi theca
<
lb
/>
ſit grauior, velociùs; </
s
>
<
s
id
="
N1112F
">ſi leuior, tardiùs iaculum fertur; </
s
>
<
s
id
="
N11133
">etiam tenera
<
lb
/>
plumarum lanugo tarditatem conciliat: </
s
>
<
s
id
="
N11139
">porrò, ſi axis mouetur mo
<
lb
/>
tu recto, quod reuerà fit, cùm iaculum deorſum demittitur in per
<
lb
/>
pendiculo, hic motus eſt ſpiralis cylindricus: ex his infinita ferè
<
lb
/>
phænomena explicari poſſunt. </
s
>
</
p
>
<
p
id
="
N11143
"
type
="
main
">
<
s
id
="
N11145
">6. Sunt infiniti propemodum motus mixti; </
s
>
<
s
id
="
N11149
">v. g. cylindri ab alte
<
lb
/>
ra extremitate rotata emiſſi; </
s
>
<
s
id
="
N11153
">longioris haſtæ, quæ ſurſum facta cir
<
lb
/>
cuitione emittitur; </
s
>
<
s
id
="
N11159
">brachij, gladij, &c. ſed potiſſimùm turbinis, qui </
s
>
</
p
>
</
section
>
</
front
>
</
text
>
</
archimedes
>