Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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tioribus minores ſunt. </
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<
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<
s
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poſſunt, ad ejus utramque partem ſingula. </
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<
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conſtructione luculentè patent; </
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<
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ſpicies; </
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<
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<
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mur; </
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<
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<
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diens radius eſt deſignandus, cujus refractus per datum punctum X
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tranſibit. </
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<
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<
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diculares AB, XP. </
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<
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tranſadigatur recta NG ſubtendens angulum APF, & </
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æquans; </
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incidentis AN refractum eſſe. </
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NG. </
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NG (vel √ Iq - Rq. </
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miſſum liquet KN ipſius AN refractum eſſe: </
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ens, ipſámque T adæquans inſeratur recta N G; </
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AN, XN; </
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S. </
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<
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conſequitur è præmonſtratis fore XN ipſius SN refractum Q. </
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duos ad unas perpendicularis AB partes incidentium refractos in uno
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puncto convenire. </
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<
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univerſis hujuſmodi conſtructionibus commune, vel invariatum per-
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perſiſtit; </
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qnoad omnes per X tranſeuntes refractos) plures duabus ſibi pares
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duabus ſibi pares rectæ angulo recto XP F, vel ABF interſeri ne-
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queunt; </
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<
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A Imago verſatur; </
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tranſit, modo jam expoſito ducendus; </
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nandum venit, ad quod illa præcisè conſiſtit; </
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dentibus haud difficulter eliciemus.</
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