Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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nùs retardat; </
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<
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N26454
">ſunt enim pauciores partes, quæ valde obliquè cadunt: </
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<
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hinc minor eſt appulſus, quod clarum eſt; hinc, vt calamus velociùs per
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gat, conſtringuntur pennæ. </
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<
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">Decimotertiò, ſi contractiores ſunt, & rectè compoſitæ, cum illa ſcili
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cet inflexione,
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eoq;
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ſitu, de quo n.11.non modò velocior erit motus axis,
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ſed etiam motus orbis; </
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<
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">ratio eſt, quia minor orbis citiùs perficitur: </
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">adde
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quod minus aëris huic motui reſiſtit; </
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<
s
id
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N26477
">vnde vides ita eſſe aptandas pen
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nas, vt reſiſtentia aëris inæqualis cauſet illam vertiginem, quæ tamen
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tanta eſſe non debet; alioquin ipſum motum orbis omninò impediret,
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vt diximus n. </
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<
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">10. </
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<
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">Decimoquartò, denique ſi plùs æquo contractæ ſunt, eſſet motus or
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bis; quippe modica eſt aëris reſiſtentia, quæ ad motum illum non ſufficit,
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licèt ſemper ſint aliqui gyri, ſed rariores. </
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<
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">Decimoquintò, tres aliquando, aliquando duæ inſeruntur pennæ; </
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<
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id
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N26494
">eſt
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enim eadem vertiginis cauſa, imò quatuor inſeri poſſent; ſunt enim quaſi
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totidem claui, qui dirigunt illum motum. </
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<
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id
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">Decimoſextò, ſi pennæ delicatioribus pilis tenera lanugine veſtian
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tur, tardiùs mouetur calamus vtroque motu; quia vix aëra penetrare poſ
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ſunt delicatiores mollioreſque pili. </
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<
s
id
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">Decimoſeptimò, ſi proiicitur ſurſum, deſcendatque deorſum rectà, eſt
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motus mixtus ex recto & circulari; </
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<
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id
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N264AE
">ſi verò proiiciatur per horizontalem,
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vel inclinatam, eſt motus mixtus ex duobus rectis & circulari, vt con
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ſtat; </
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<
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id
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">ex quo motu fit linea mixta ex Parabola & Helice; </
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<
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id
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N264BA
">ſit enim cylin
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drus CH, cuius motus ſpiralis ſit CEFGT mixtus ex recto CT, & cir
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culari orbis CD; ſit etiam mixtus LTQ ex accelerato LM, & æquabili
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MQ certè ſi addatur LQ circulus ſeu ſpira CEF, &c. </
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<
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id
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N264C7
">ſitque RC æqua
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lis IE, & VT æqualis NG, habebitur ſpira mixta LCSVQ </
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<
s
id
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">Decimooctauò, ſi pennæ latiores ſunt, ſeu maiorem habent ſuperfi
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ciem, minùs aptæ ſunt ad vtrumque motum, ſcilicet axis, & centri; quia
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aër plùs æquo reſiſtit, nam plures illius pelluntur partes. </
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<
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">Decimononò, ſi verò contractiores ſunt, etiam minùs aptæ videntur:
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quippe aëra facilè diuidunt. </
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<
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id
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">Vigeſimò, ſi breuiores, certiſſimus eſt motus orbis; quia minor circu
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lus citiùs perficitur. </
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>
</
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<
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id
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">Vigeſimoprimò, ſi longiores, è contrario: adde quod ab axis leuioris
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motu, dirigi vix poſſunt. </
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>
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id
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<
s
id
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N264F4
">Vigeſimoſecundò, ſi altera pennarum ſit fracta, eſſet motus orbis; quia
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ſegmentum fractum aliarum partium motum non ſequitur, vt patet. </
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<
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">Vigeſimotertiò, ſi calamus ſit leuior, ineptus eſt; </
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<
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N26500
">quia reſiſtentiam
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pennarum non ſuperat; quippe contra reflantis aëris vim, calami præua
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lens impetus leuiores pennas ſecum abripere debet. </
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<
s
id
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">Vigeſimoquartò, ſi longior ſit calamus, minùs aptus eſt; quia ſcilicet
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plures partes impetus quæ inſunt grauiori calamo nullo negotio reſi
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ſtentiam aëris, & retardationem pennarum ſuperant. </
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<
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">Vigeſimoquintò, ſi longior ſit calamus, minùs aptus eſt; </
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<
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