Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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<
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XIV.</
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">_I.</
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">S_ub pracedentis calcem, Regulam pollicebamur, exemplis ſtipa-
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tam, ex qua punctorum è variis inflectionibus reſultantes, ima-
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gines dignoſcantur. </
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<
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">iſlam nunc exhibemus quàm ſimplicimè conceptam.</
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<
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">Sit ABEFO radius principalis, puncti radiantis A ſpeciem per
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">Fig. 149,
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150.</
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oculi centrum O deferens, ex incidente primo AB, & </
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">inflexis BE,
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EF, FO (in directum aut ſecùs diſpoſitis) conſtans; </
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<
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">tum puncti A
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reſpectu oculi in recta B E poſiti, & </
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<
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">ex inflectione ad ſuperficiem B
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reſultans (è præmiſſis utique deſignabilis) imago ſit Z. </
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<
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">item hujus Z
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(quod jam veluti radians concipiatur) reſpectu oculi in recta E F
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conſtituti, & </
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<
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">ab inflectione ad ſuperficiem E emergens imago ſit Y;
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</
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<
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">demùm puncti Y (tanquam in ſuperficiem F radiantis) reſpectu oculi
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in FO collocati ſit imago X. </
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<
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xml:space
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">erit hoc punctum Ximago cunctis ab
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his inflectionibus proveniens. </
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<
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xml:space
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">neque ſecùs quotcunque fuerint inflecti-
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ones ſeſe res habebit; </
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<
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">enimverò ſemper ex illa tali poſtrema inflectione
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reſultans imago, eadem erit cum illa, quam omnes exhibent.</
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<
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">Hujus effati veritas è conſtructione ſatìs apparet; </
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<
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">è qua facilè colli-
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gitur proximorum ipſi AB incidentium hinc indè radiorum inflexos
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tandem circa punctum Xipſum FX interſecare. </
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<
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</
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<
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">punctum Z eſt puncti A imago; </
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punctum Xipſius Y; </
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<
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">itaque punctum X ipſius A imago erit, qualem
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nempe res hîc fert, remota. </
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">Strictiore longiuſculo diſcurſu poſſet hoc
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comprobari, ſed quorſum rem ſatìs claram intricare?</
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<
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ſubnectam. </
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<
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">Notetur autem imagines, quæ in iis pròponuntur deſig-
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nandæ, oculum reſpicere Centrum habentem in ipſo radiationis axe
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(qualis eſt recta BD) conſtitutum. </
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<
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">item diverſarum ſuperficierum
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ac radiationum axes ſibimet in directum poni. </
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<
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refractionibus ex aere factis ad vitrum fore I. </
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vero fore I. </
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