Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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<
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36
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025/01/040.jpg
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motus ex recto accelerato & circulari compoſitus eſſe videatur; hinc
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initio ſpiſſiores & preſſiores ſpiræ, deinde verò diſtractiores fiunt; eſt
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tamen tantùm vnus impetus ad motum deorſum rectum per ſe determi
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natus, qui cùm in linea recta finem ſuum obtinere non poſſit compenſat
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in circulari, retenta ſemper prima illa inclinatione ad rectum, cui quan
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tum poteſt, ſatisfacit, cùm autem etiam ſecundùm id acceleratus ſit, in
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de ſpiras diſtrahi neceſſe eſt. </
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Auguſtin.
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<
s
id
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s.000433
"> Iam capio, quod ante dixeras, naturam ſupplere æquali
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tatem motuum: nempe aqua, ſeu corpus grave toto illo tempore, quo
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præfatus cylindrus aëris ſenſim aſſurgit, motu accelerato deorſum, re
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moto impedimento, longum ſpatium in perpendiculari decurreret; ſed
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obſtante impedimento, cùm eadem vis impetus adſit, motum rectum
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ſpirali compenſat; atque adeò ſi tota illa ſpirarum congeries in lineam
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rectam explicaretur, æqualis eſſet lineæ rectæ in perpendiculo eodem
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tempore motu accelerato confectæ, ſed applica quæſo ad ſpiras Solares. </
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Antim.
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type
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</
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<
s
id
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s.000435
"> Repete igitur figuram 2. & conſidera primo loco primam in
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clinationem ſeorſim, quâ Sol ab Apogæo ad Perigæum, & viciſſim, per
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mediocrem diſtantiam, reciprocis acceſſibus & receſſibus, ad imitatio
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nem motus accelerati & retardati tendit reditque. </
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id
="
id.025.01.040.1.jpg
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xlink:href
="
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number
="
11
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type
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<
s
id
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s.000436
">Et cogita radium AE moveri cir
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ca AC, dum punctum E motu ac
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celerato tendit ad V, & retardato,
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ab V ad H, radius AE deſcribet
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ſuo motu ſuperficiem coni, cuius
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baſis diameter, erit EL, punctum
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verò E deſcribet tot ſpiras in dicta
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ſuperficie coni, quot revolutiones
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abſolventur, toto illo tempore,
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quo ab E, pervenit in H ; hæc au
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tem ſpira erit conica, cuius Helices
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diſtractiores erunt circa V, preſ
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ſiores circa E & H. </
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>
<
s
id
="
s.000437
">Pari modo, co
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gita triangulum ADE in orbem
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agi, circa Axem BC dum D, motu
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accelerato, tendit ad F, & retar
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dato ab F, ad E; arcus DFE de
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ſcribet partem ſuperficiei ſphæricæ,
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punctum verò ſpiram ſphæricam,
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cuius Helices preſſiores erunt cir
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ca DE, diſtractiores verò circa F.
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</
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<
s
id
="
s.000438
">Si verò D iret per lineam rectam
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DGE, deſcribet DGE ſuperfi
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ciem cylindricam, & D ſpiram cylin
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dricam. </
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>
<
s
id
="
s.000439
">Iam verò
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cõponaturvtraque
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inclinatio, ita vt D partim versùs F, </
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