Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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PQ, erit æqualis 26190. cui ſi addas ſinum rectum eiuſdem arcus, ſcili
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cet. 25038. erit compoſita ex vtraque 51228. rejecta minutia, hic erit mo
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tus puncto E, eo tempore, quo decurrit arcum 15.grad. iam verò accipe
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ſecantem eiuſdem anguli 103290. ex qua, ſi ſubſtrahas ſinum totum, reſi
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duum erit 3290. hic eſt motus puncti F, eodem tempore, qui ad priorem
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habet rationem 1/1
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iam verò ſi accipias arcum 3. grad. ſcilicet 5238. eiuſ
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dem ſinum rectum 5233. compoſita ex vtraque erit 10471. differentia ve
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rò ſecantis & ſinus totius ejuſdem anguli 137. Cùm igitur motus E per
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arcum 3. grad. ſit ad motum F per arcum æqualem vt 10471. ad 137. erit
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vt 75. ad 1. ſit motus per arcum 1. grad. erit compoſita ex arcu & ſinu 3491.
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differentia ſecantis & ſinus totius 15. igitur ratio maioris motus ad
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mino-rẽ
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rem</
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. </
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">Accipe arcum 30. minutorum, erit ſumma, arcus & ſinus recti 1746.
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differentia 4. igitur ratio
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accipiamus 15. erit, ſumma 872. differentia
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1. igitur ratio
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. </
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<
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">Si vltra progredimur, ſecantes ceſſant in canone Pi
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tiſci, etſi veniamus ad
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vnũ
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<
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minutũ
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, quid tandem erit? </
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">quid ſi ad vnum ſe
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cundum, aut tertium &c. </
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<
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">immo quantumvis parvum arcum accipias, erit
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maior proportio ex triplici capite. </
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">Primò, quia curva EQ eſt maior rectâ
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OQ, ſed per EQ movetur punctum E, idem de aliis arcubus. </
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">Secundò,
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quia differentia ſecantis & ſinus recti eſt major RT, igitur, hic accipitur
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maior, illic verò minor motus, quàm reverà ſit. </
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">Tertiò quia E à puncto
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oppoſitionis versùs Q continuò retardat motum ſuum; igitur movetur
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velociùs in primo gradu, quam in ſecundo & in hoc citiùs, quàm in ter
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tio, atque ita deinceps 5 cum tamen F à puncto oppoſitionis verſus R mo
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tum ſuum continuò acceleret; ac proinde moveatur citius in ſecun
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do gradu quàm in primo & in tertio quàm in ſecundo, atque ita dein
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ceps; conſtat igitur: quod initio à me propoſitum fuit, majorem
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eſſe proportionem motus ſupremi puncti rotæ; quæ in plano volvi
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tur, ad motum infimi, qualibet aſſignabili; hinc paradoxum egre
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gium, ita moveri duo extrema ejuſdem lineæ finitæ, vt vnum alio infi
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nities velociùs moveatur, infinities, inquam, Syncategorematicè,
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nec eſt par ratio rotæ, quæ motu tantùm orbis movetur, quia centrum
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illius ſupponitur immobile, nec vllum punctum aſſignari poteſt, in radio
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mobili, circa alteram extremitatem, cujus motus ad motum alterius ex
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tremitatis certam & finitam proportionem non habeat; denique huc etiam
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plurimùm, immo totum facit angulus contingentiæ, quem prædictus circu
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lus cum plano facit eo ſanè minorem, quo circulus major eſt, cùm enim
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quolibet angulo rectilineo, quamtumvis minimo, minor ſit, id que in infini
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tum; motus puncti infimi rotæ, ſeu contactus, eo ipſo incipit, quò tangere
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planum deſinit, intercepto dumtaxat dicti anguli contingentiæ cuſpide,
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omni rectilineo minore. </
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Auguſtin.
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<
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"> Quid ſi aliquis diceret, punctum illud aliquantulum quieſcere,
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ad inſtar cuiuſdam polygoni infinitorum laterum? </
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<
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">Sic enim polygonum in
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plano volvitur, vt circa ſingulos laterum angulos totum polygonum ſuc
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ceſſivè volvatur. </
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Antim.
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<
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"> Scio, à viro doctiſſimo hæc iam olim fuiſſe dicta, ſed Geome-</
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