Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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igitur, ſi nihil aliud eſſet, globus quieſceret; at verò ratione impetus
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noui producti ab alio globo, vel eius impetu, retroagitur. </
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Theorema
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72.
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Poteſt globus retroagi, licèt in aliud corpus non incidat
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: hoc eſt vulgare,
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mirificum tamen experimentum, ſit enim globus ECBL incubans
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plano horizontali MLG, in quem deſcendat planum, quod niſi globi
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reſiſteret materies, reſecaret ſectionem DHE. </
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<
s
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">Dico quod ab iſto ictu
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globus determinabitur ad duos motus, alterum centri K verſus A, alte
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rum orbis puncti D ſcilicet, vel C verſus E, ita vt initio motus centri
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præualeat verſus A, qui citò deſtruitur propter affrictum partium plani; </
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vnde remanet tantùm motus orbis, quo ſcilicet globus rotatur verſus F; </
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nec eſt alia ratio huius experimenti, in quo habetur quædam reflexio ſi
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ne corpore reflectente: pro quo obſerua fore vt experimentum meliùs
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ſuccedat, ſi cadat ictus propiùs ad punctum C, quia diutiùs voluitur
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orbis. </
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Theorema
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73.
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Hinc etiam ratio euidentiſſima alterius experimenti, quod valdè familiare
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eſt iis, qui breuioribus globulis ludunt
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; </
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<
s
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">ſi enim ita proiiciatur per medium
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aëra globulus, vt eius hemiſphærium ſuperiùs moueatur contrario motu
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motui centri, vel vt Aſtronomi loquuntur in Antecedentia, vbi globulus
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terræ planum attingit, vel illico conſiſtit, vel retroagitur, niſi aliqua
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portio plani inæqualis aliò reflectat; </
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<
s
id
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">cuius rei ratio eſt duplex ille mo
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tus, quorum ſi determinatio æqualis eſt, conſiſtit globus; </
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<
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natio motus orbis ſit maior, quod ſemper accidit in breuiore ictu; certè
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cum præualeat, globum retroire neceſſe eſt. </
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Theorema
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74.
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Globulus eburneus in alium impactus conſistit quidem ſi centrum respicias
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; </
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at verò ſæpè accidit globulum circa centrum ſuum immobile motu cir
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culari & horizontali ad inſtar vorticis conuolui; </
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<
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id
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">cuius effectus ratio eſt,
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quia cùm prior impetus ideo tantùm deſtruatur, quia eſt fruſtrà, & fru
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ſtrà eſt, quia æqualis eſt determinatio vtraque per lineas oppoſitas, de
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terminatio inquam motus centri; </
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<
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">ſi tamen globi deficiat æquilibrium, vt
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ſemper reuerâ tantillùm deficit, in partem illam globus voluitur, vt vide
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mus in corpore oblongo, cuius dum vna extremitas pellitur circa cen
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trum aliquod voluitur; </
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<
s
id
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">ſed de motu circulari infrà; ſed tantiſper ſphæ
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riſterium ingredi placuit, vt alios effectus motus reflexi demon
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ſtremus. </
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Theorema
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75.
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Cum pila coniicitur in parietem ad latus, reſilit in pauimentum, vnde ite
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rum repercutitur fallente ſaltu
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; </
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<
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motu mouetur pila in vltimo ſaltu; </
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<
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