Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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Axioma
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1.
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Illa partes mouentur velociùs, quæ tempore aquali maius ſpatium acquirunt
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tardiùs verò, que minus ſpatium, clariſſimum eſt, nec maiori indiget expli
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catione.
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Axioma
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2.
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Cum vtraque determinatio motus ad
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eãdem
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partem ſpectat, acquiritur
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maius ſpatium; </
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<
s
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">tum verò ad diuerſas partes minus, at que ita prorata
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; hoc
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etiam Axioma certum eſt. </
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Hypotheſis.
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Rotæ circa idem centrum mobilis ſemicirculi oppoſiti in partes contrarias
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feruntur, motu ſcilicet orbis per arcus ſcilicet æquales
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; </
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<
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æquales ſunt; ſed arcus ſunt vt anguli. </
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Poſtulatum.
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Liceat rotare orbem in plana ſuperficie, in conuexa, in concaua, in æquali. </
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inæquali, ita vt motus orbis conueniat cum motu centri, vel ab eo diuerſus ſit.
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Theorema
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1.
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Rota, quæ mouetur in ſuperficie plana, mouetur motu mixto ex recto centri
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& circulari orbis
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; </
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<
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">ſit enim AQLZ incubans plano AD in quo rotatur,
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ſitque AD recta æqualis arcui
<
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abbr
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Aq;
">Aque</
expan
>
certè poſito quod motus orbis ſit æ
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qualis motui centri, id eſt poſito quod æqualibus temporibus ſegmentum
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plani percurratur motu centri v.g. QE vel AD æquale arcui, qui circa
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centrum O conuoluitur motu orbis, v.g. arcui AQ, quodlibet punctum
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peripheriæ rotæ mouebitur motu mixto ex recto, & circulari v. g. pun
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ctum L motu centri fertur verſus V & motu orbis verſus Q; ſi enim
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eſſet tantum motus centri verſus E, omnes partes mouerentur motu recto
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v.g. L per rectam LV, A per rectam AD; </
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<
s
id
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">ſi verò eſſet tantùm motus
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orbis, omnes partes mouerentur tantùm motu circulari v. g. L, per ar
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cum LZ; A per arcum AZ; </
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<
s
id
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">at cum ſimul ſit vterque motus, id eſt vtraque
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determinatio, certè vtraque confert de ſuo; igitur eſt motus mixtus. </
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Theorema
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2.
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Vnicum tantùm punctum rotæ mouetur metu recto, ſcilicet centrum, cætera
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per lineam curuam
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; </
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<
s
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">de centro conſtat, quia cùm ſemper æqualiter diſter
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à planis AD & LV, ſcilicet eodem radio OL, ON; </
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<
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">certè percurrit OE
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parallelam vtrique; ſed parallela vtrique eſt recta, punctum verò L mo
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uetur per lineam curuam, vt conſtabit ex illius deſcriptione, quàm tra
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demus infrà. </
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Theorema
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4.
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Si diuidatur arcus LQ in tres arcus aquales & planum AD in tres par
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tes æquales, poteſt aſſignari punctum, in quo ſit L decurſo prime arcu LK
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; </
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<
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enim eſſet tantùm
<
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coętri
">centri</
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, eſſet in
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foreign
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, ſi motus orbis eſſet in K; </
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<
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ſit recta MI parallela LV, ſitque KI æqualis AB, vel L
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<
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