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