Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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ſpatium NR pertinentes intra ZV eidem occurrere; </
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<
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xml:space
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us citra punctum M, vel ultra R incidentis refractum (ſeu nullum
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citra X, vel ultra V cum ipſo KN concurrentem) oculum ingredi
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poſſe. </
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<
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xml:space
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">quare ſaltem imago conſiſtet intra terminos VX; </
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<
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aliunde qui videntur emanare _Radii_ nihil quicquam ad viſionem con-
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ferent, aut ad eam ullatenus pertinebunt. </
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<
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">cæterum quoniam ab VX
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procedentium (apparenter, inquam, procedentium) reciſſimi, vel
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axi propriores velut ab ipſo Z procedere videntur (ſeu à loco qui
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circa ipſum) ipsíque proinde validiùs afficiunt oculum, & </
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<
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fa
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ciliùs adunari, recolligíque poſſunt; </
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<
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<
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">ii præ cæteris confer-
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tim irruant (illi ſaltem qui ad partes NR, ) quia denique propter
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anguſtiam pupillæ ſpatium VX haud ita magnum exiſtit; </
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<
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guam, hæcità ſe habeant, omnino rationi conſentaneum eſt, dictam
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imaginem circa punctum Z verſari; </
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<
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">nec alias arbitror excogitari poſſe
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veriſimiles cauſas, quæ ſitum ejus determinent. </
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<
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">_Alhazenw_ quidem,
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& </
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">poſt eum pleraque cohors _Opticorum_ ipſam ad punctum K, ubi
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principalis refractus perpendicularem AB decuſſat, conſtituit; </
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note
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rùm haud ullam rei natura cauſam ſuggerit, cur inibi ſtatuatur. </
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enim (niſi ſaltem pupilla perpendicularem ipſam AB comprehendat,
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oculuſque valdè ſit ei propinquus) per illud punctum means radius,
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afficiendo viſui minimè ſuffecturus, ingredietur oculum; </
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<
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">eadémque
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punctorum intra KX ipſi K adjacentium eſt ratio; </
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<
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ea permeans refractus oculum attingit; </
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punctum A circa K appareat. </
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">quin adhuc à vero magis aberrat, *qui
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faciens NH æ qualem ipſi NA puncto H affigit imaginem (huc, opi-
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nior, impulſus quia taliter in reflectione ſe rem habere perſpexit;
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</
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">cui ſimilis cauſa nì fallor _Euclidem, Alhazenum, Stevinum_ (quan-
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quam ipſos in diverſum euntes) horúmque ſequaces, in _Catoptricis_,
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in errorem egit; </
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<
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xml:space
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">prout uſu non rarò venit _analogias haud bene_
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_fundatas,_ indiſtinctéque perceptas mortalibus imponere; </
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<
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quod dixi magìs iſta ſententia abhorret à ratione. </
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<
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">) nullus enim in
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primo caſu refractorum concurſus fit infra angulum ABF; </
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<
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illum in ſecundo; </
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<
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priorem _Alhazeni_ percellunt ſententiam. </
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<
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ſed præſertim hæc, multiplici refragatur experientiæ, multiplicíque
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ratiocinio; </
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<
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in _Dioptricis circularibus_; </
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ab experientiâ, quàm à ratione compertum eſt. </
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ſubvertit ac peſſum dat quod ſupra propoſuimus experimentum, nemi-
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ni non obvium; </
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