Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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451 - 480
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<
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motu recto; </
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<
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id
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">denique non eſt omittendum etiam haſtam eratam ſolo
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nixam ſurſum intorto pugno ita proijci poſſe, vt poſt circuitum excipia
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tur, nec eſt noua difficultas; communicatur enim primò motus centri
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rectus, tùm motus orbis, immò, ſi ſit breuior, etiam geminos circuitus
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facit, antequam iuſta manu excipiatur. </
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<
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<
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">Decimoquintò, extremitas, quæ manu tenetur velociùs deinde moue
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tur. </
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<
s
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">Primò, patet experientia. </
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<
s
id
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">Secundò, maius ſpatium conficit; </
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>
<
s
id
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">ratio eſt,
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quia mouetur circa centrum maiore ſemidiametro, quas conſtat 1/4 totius
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haſtæ, quod vt faciliùs videatur, ſit haſta AE, quæ pellatur ſurſum mo
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tu recto CE, ſitque motus orbis circa centrum C; </
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>
<
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id
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N26B09
">vbi verò C peruenit
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in D, A peruenit in L, & D in I; </
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>
<
s
id
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N26B0F
">vbi verò C peruenit in E, A peruenit in
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G & D rediit in D; </
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>
<
s
id
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N26B15
">vides quanta ſit differentia motus; </
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>
<
s
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">nam eo tempore,
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quo A decurrit ſpatium AKL, D decurrit tantùm DHI; </
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<
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">quænam por
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rò ſit hæc figura; </
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<
s
id
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">certè ſi non eſt Ellipſis, propiùs ad illam accedit:
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idem dico de deſcenſu haſtæ, quod dictum eſt de aſcenſu. </
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</
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<
s
id
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">Decimoſextò, duobus aliis modis poteſt haſta in aëre
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cõuerti
">conuerti</
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; </
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<
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id
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">primò, ſi
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mucro agatur retrò, vtraque manu admota alteri extremitati: </
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>
<
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id
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">hic autem
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modus differt à prioribus, quod in illis motus centri rectus præcedat
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motum orbis; in hoc verò vterque ſimul incipiat. </
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<
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id
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N26B43
">Secundò, ſi primò in
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humeris liberetur haſta, tùm ſurſum euibretur; ſed hæc ſunt facilia. </
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>
</
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<
s
id
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">Decimoſeptimò, ad haſtam reuocabis baculum rotatum ab altera ex
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tremitate; ſit enim baculus AE rotatus circa extremitatem A, tùm ſta
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tim demiſſus. </
s
>
<
s
id
="
N26B53
">Primò, E poſt ſemicirculum peruenit in A. Secundò, E im
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primitur maior impetus, vt patet: hinc tertiò mouetur velocius. </
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<
s
id
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N26B59
">Quartò,
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A non deſcendit infra AE, poſt quam demiſſus eſt baculus, vt pater ex
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perientiâ; ratio eſt, quia E per tangentem EL determinata impedit, ne
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A deorſum tendat. </
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<
s
id
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">Quintò, E per arcum EG non mouetur; </
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<
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id
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N26B67
">alioquin A
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eſſet immobilis: </
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<
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id
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">præterea F. non mouetur motu circulari, niſi retineatur
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in A; </
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<
s
id
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N26B73
">ſed non retinetur; igitur non mouetur per EG. Sextò, non moue
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tur quoque per rectam EF, quia retinetur E ab A, & reliquis partibus,
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quæ minùs habent impetus. </
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>
<
s
id
="
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">Septimò, mouetur E per lineam curuam, quæ
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accedit ad ellipſim, ſcilicet per EHA; </
s
>
<
s
id
="
N26B81
">A verò aſſurgit ſupra AE; </
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>
<
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id
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">ratio
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huius motus petitur ex eo quod, neque per EF, neque per arcum EG
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mouetur extremitas E; igitur per curuam de vtraque participan
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tem. </
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>
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type
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<
s
id
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N26B91
">Decimooctauò, cum ita proijcitur baculus, vt altera extremitas citíùs
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moueatur quàm alia, ſequitur motus mixtus ex recto centri, & circulari
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orbis; </
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<
s
id
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N26B99
">quia ſcilicet illa pars, quæ maiorem impetum habet, quaſi retrò
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agitur ab alia, quæ minorem habet, non quidem motu purè circulari;
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alioqui omninò retineretur ab alia extremitate, ſed alio mixto, quia non
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omninò retinetur. </
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type
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<
s
id
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">Decimononò, hinc poteſt ita temperari motus ille orbis, vt tantùm
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ſemicircuitum in toto curſu impleat, cum ſcilicet partes omnes æquali
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ferè cum impetu mouentur; </
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<
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id
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">ſi enim æqualitas eſt in motu omnium
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partium, mouentur omnes motu recto; </
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<
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id
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">ſi verò motus ſingularum ſunt </
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