Ceva, Giovanni
,
Geometria motus
,
1692
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tus OT, ſiue baſis parabolæ QI. </
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putetur eſſe ORI, in qua punctum R eſto vbi mobile adeſt
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momento K, deducantur verò ab eodem illo puncto RS
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parallela axi QO, et RP æquidiſtans QI, vel OT, profectò
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in O, momento F, ſicuti in ſpirali, nulla erit mobili veloci
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tas, ſed cum eſt in R momento K habebit geminam veloci
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tatem, KL ſecundùm SR, et KN iuxta PR perpendicularem
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ipſi SR, quæ duæ velocitates itidem component vnicam
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potentia ſimul illis æqualem, & cum idem dicatur de qui
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buſcunque alijs punctis parabolæ, momentis temporis FI
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reſpondentibus, manifeſtum eſt ſpirali BCA, & parabolæ
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ORI vnicam, eandemque eſſe imaginem velocitatum, pro
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pterquam quòd ipſæ curuæ, quòd ſint vt imagines, erunt
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interſe æquales.
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Cor. </
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4.
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huius.
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Pr.
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2.
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primą
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Pr.
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8.
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huius.
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Cor. </
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13.
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huius.
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Pr.
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10.
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primi
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huius.
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2.
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primi
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huius.
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2.
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prima.
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Scholium.
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Exemplo traditarum curuarum, poſſunt innumeræ ſpira
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les ſuis parabolis æquales excogitari, nec ideo res minùs de
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monſtrabitur, ſi loco rectarum, ſeu laterum OT, OP compoſiti
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motus, ſubſtituantur circuli, aut circulorum arcus, qui ad re
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ctos angulos ſe ſecent, ſcilicet
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tangentes ad punctum infle
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xionis, ſeu occurſus ipſarum curuarum ſibi ipſis perpendicula
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res fuerint. </
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<
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">Quòd ſi ipſa curua latera ad rectos angulos non
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ſe ſecent curuæ nihilominus ab ipſo compoſito motu naſcen
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tes poterunt exhiberi curuas parabolicas exequantes, quarum
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itidem latera ſint rectæ eundem angulum, quem prædictæ
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, comprehendentes. </
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<
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">Sed de his ſatis, nunc dicamus ea
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tempora, quibus duorum pendulorum ſimiles vibrationes ab
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ſoluuntur, hoc eſt Galilei ſententiam demonſtrabimus, quam
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quondam haud ruditer decepti falſam credidimus.
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Vincentius Viuianus eximius noſtri æui Geometra vt tue
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retur Galilei ſententiam, cuius digniſſimè ſe fuiſſe diſcipu
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lum profitetur, tradidit mihi per admodum Reuerendum, at-
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