Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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unde Problematis conſtructio, ſeu puncti Z dererminatio habetur.</
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<
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repertam ab ipſo, concinneque demonſtratam) conſtructionem:
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Fac NP. </
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& </
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<
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NK in foco quæſito Z.</
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<
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ginis puncti A, oculo apparentis in ipſa N π conſtituto, ſæpiùs expo-
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ſitæ rationes manifeſtant.</
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ratio æqualitatis, quòd punctum Z infinito à puncto G, vel N inter-
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vallo diſtabit; </
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<
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infra G, vel in NG antrorſum protracta; </
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quod punctum Z ſupra N, vel in NG retrò tractâ verſatur. </
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ſuffecerit innuiſſe. </
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titas utcunque poſſit determinari. </
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<
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ipsámque proinde miſſam facio.</
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que nonnullis forſan (_utpote communibus Opticæ decretis apparenter_
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_adverſum)_ mirabile videatur, explicationem. </
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(modicè diſtantis, & </
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MBN (ab axe A B biſectum) imago, ſeufocus Z; </
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AZ perpendicularis traducta concipiatur linea XY. </
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matur aliud punctum remotius E; </
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Z (centrum verſus) jacere; </
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refracti adhuc altiùs ſe interſecant, puta ad K; </
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NK lineam XY ſecent punctis O, P. </
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punctum F; </
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</
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intervallum RS ipſo OP majus eſſe. </
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<
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punctum lucidum (velut _ardens lucerna,_ vel _Imago Solis_ ad _Speculum_
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aut _lentem diaphanam_ effecta, (quin & </
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guitatem ſuam apparentem punctorum ad inſtar haberi poſſunt) quò
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a diſtinctæ viſionis loco longiùs amovetur, eò (contra quàm in </
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