Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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pillæ latitudinem, ipſum ſpatium KZ non ità magnum eſſe; </
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<
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xml:space
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_Puncti_ poſſit cenſeri. </
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<
s
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echoid-s2844
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xml:space
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">Quibus expenſis luculentè conſtare videtur pro-
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poſitum.</
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<
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<
s
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xml:space
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">XVIII. </
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<
s
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xml:space
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">Subdo tantùm, ſi oculus uſquam intra ſpacium ZB ſtatua-
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tur, viſionem indè confuſam, aut nullam evadere; </
s
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<
s
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echoid-s2848
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xml:space
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">quia nempe tunc
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reflexi præcipui (ſeu rectiſſimi) oculum convergentes appellent.</
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<
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<
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">XIX. </
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<
s
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echoid-s2851
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">Ex his porrò facilè refelluntur, quæ de imaginis loco pleni-
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que tradunt omnes Optici; </
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<
s
xml:id
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xml:space
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">cum illis noviſſimus _Honor. </
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<
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">Fabri;_ </
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<
s
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xml:space
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">juxta
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quorum doctrinam imago à puncto reflectionis tanto diſtat intervallo,
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quanto punctum radians ab eodem ſemovetur; </
s
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<
s
xml:id
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echoid-s2855
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xml:space
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">ità quidem ut Sol ex hu-
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juſmodi reflectione conſpicuus ad tantam, quantam directè ſpectatus, di-
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ſtantiam (eorum inſiſtendo ſententiæ) debeat apparere. </
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<
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xml:space
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">quod im-
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mane quantum experientiæ refragatur. </
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<
s
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xml:space
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">etenim ſi Soli exponatur _Spt-_
<
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_culnm_ RB, (concavum, aut convexum) ſic ut ei Sol quaſi perpen-
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diculariter immineat, oculúſque prope axem BC conſtituatur uſpi-
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am; </
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<
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xml:space
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">ferè circa punctum Z, arbitrante ſenſu, luculenta Solis imago
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ſeſe præbebit oculo conſpiciendam; </
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<
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xml:space
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">id quod juxta ratiocinium no-
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ſtrum neceſſariò debuit evenire. </
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<
s
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xml:space
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">verùm hic error (in Opticâ capitalis,
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& </
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<
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xml:space
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">quo non ablegato nulla phænomeni cujuſcunque ratio veriſimilis
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conſtabit) ubique ſe objiciet refutandum. </
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<
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xml:space
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">hîc itaque pluribus parco;
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</
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<
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">pergóque verſus oculum extra radiationis axem poſitum; </
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<
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unicam hanc præcedentibus adnexam obnſervationem ſubjecero.</
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<
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<
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<
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">Objectum
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viſibile clariùs atque diſtinctiùs repræſentat, quàm minoris æq@alem
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obtinens latitudinem portio.</
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<
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">Super eandem nempe ſubtenſam NV inſiſtant imparium circulo-
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rum ſegmenta NBV, Nbv; </
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">& </
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rum centra C, c; </
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NBV jacere; </
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<
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xml:space
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">ità majoris centrum C infra minoris centrum c ex-
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note
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iſtere. </
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tangentes BT, bt; </
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</
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<
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">denuò radii PN axi paralleli ſit ad peripheriam NBV reflexus NK; </
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ad ipſam verò Nbv ſit ejuſdem reflexus Nk; </
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<
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quòd ſit Ne &</
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<
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adeóque ſimpla zk major ſimplâ ZK. </
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<
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tio ſtrictiores intra terminos illabentem lucem cogit; </
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<
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tentiùs operatur; </
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<
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