Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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ſuo æſtimanda, ad vitæ communis uſum beneſicia ſubminiſtret; </
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<
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imperfectionibus & </
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xml:space
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">vitiis tam prompta, quàm certa, minimi ſumptûs,
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& </
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<
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<
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xml:space
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">Neque, quum curioſiſſimus
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iſte ſenſus noſter ità varias indies, ità miras rerum ſpecies exhibeat
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nobis; </
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<
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xml:space
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">non admodum oblectare nos, non eximiâ voluptate mentes
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noſtras afficere poſſit, unde talis emergat apparentiarum diverſitas, & </
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quis ſit illas attingendi modus nedum accuratè, certóque cognoſcere,
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ſed utcunque veriſimilitér arbitrari; </
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<
s
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xml:space
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">præſertim quum in nullâ parte
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noſtri, nec in tota fortaſſis rerum compage, neceſſitatibus, commo-
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dis, & </
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>
<
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xml:space
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">voluptatibus noſtris proſpicientis melioris naturæ ſeu fines
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agendi, ſeu modos pleniùs queamus perſpicere; </
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<
s
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xml:space
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">nuſquam adeò di-
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ftinctiùs aut apertiùs opificis _πανσφδ_ eluceat artificium. </
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<
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elogia pertexere non vacat, aut convenit nobis. </
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aggrediamur.</
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<
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">III. </
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xml:space
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">Quæ circa viſum occupatur diſcipiina communiter in tria mem-
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bra diſpertitur; </
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">primum, quod viſus directis radiis objecta cernentis
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affectiones conſiderat (hoc ſpeciatim Optice nominatur;) </
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">alterum,
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quod è radiorum ab opacis corporibus repercuſſu oriundas ſpeculatur
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apparentias (cui Catoptricæ nomen inditum;) </
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<
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">tertium denique, quod
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ideò Dioptrica vocitatur, quia cauſas inveſtigat, aut exponit eorum
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quæ à radiis apparent per diverſa media tranſlucentibus, & </
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<
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curſu demutatis Quam diſtributionem ut non improbamus, ità nobis
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haud obſervandam proponimus; </
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<
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xml:space
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">nedum quia multa pariter his com-
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munia ſunt, at præcipuè quia viſio quævis, ut libet ſimplex ac directa,
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ſicuti reverà non abſque nonnulla radiorum inflectione peragitur, ità
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nec eâ ſeclusâ penitus intelligi poteſt aut explicari. </
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methodo potiùs inſiſtendum cenſemus; </
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ſas (quæ ſcilicet illam extrinſecus eſſiciunt, aut afficiunt) examine-
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mus; </
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<
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">tum ut videndi modum (hoc eſt quo pacto ſenſus hic noſter ido-
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neis organis inſtructus iſtis concurrentibus cauſis, objectorum illas,
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quas experimur, differentias apprehendit) adnitamur exponere; </
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<
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hinc, ut Phænomena quædam ſelectiora ſuſcipiamus elucidanda;
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</
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<
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">poſtremóque forſan, ut de viſùs remediis ac ſubſidiis aliquid ſub-
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jungamus.</
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<
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exiſtimo, non ullâ (quanquam _Empedocli, Platoui, Enclidi_, veteribus
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aliisid placitum erat) ab oculo radiorum emiſſione, verùm ab objectis
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defluente re quâpiam, oculoſque percellente viſum effici; </
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