Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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id quadantenus hoc modo pertentantes attingetis. </
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<
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xml:space
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">Oculi centrum
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(quale dari paſſim ſupponitur, ei ſaltem analogum quid dari videtur;
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</
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<
s
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xml:space
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">nec indè, quoad illam quæ præ manibus rem, erroris quicquam
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proveniet) oculi centrum, inquam, ubicunque pro libitu conſtitu-
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tum ceu punctum radians concipiatur; </
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<
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xml:space
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">tum ex eo duo prodeuntes
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radii ad propoſitam ſuperficiem (eo quem hujus exigit natura vel pro-
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prietas ſpecialis modo) inflectantur. </
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<
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xml:space
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">tum inter hos inflexos colloca-
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tum intelligatur objectum; </
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<
s
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xml:space
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">ejus certè ſpecies inter duos primos ab
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oculi centro procedentes radios conſiſtet, quæ cum ipſo (quoad ap-
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parentem anguli quantitatem, punctorum correſpondentium poſitionem,
<
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& </
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<
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">reliquas affectiones) objecto comparata voti compotes vos reddet; </
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& </
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<
s
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xml:space
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">id quidem perfectius, ſi extremorum ac mediorum præſertim
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objecti punctorum juſtas imagines, ex doctrina hactenus tradita,
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velitis inveſtigare. </
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<
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xml:space
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">ab appoſitis exemplis res manifeſtior evadet; </
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<
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">in
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quibus notetur punctum O ſemper oculi centrum, rectam OBA ra-
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diationis axem (ſuperficiebus inflectentibus perpendicularem, & </
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<
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in partes æ quales dirimentem) denotare.</
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<
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">Fig. 169.</
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_ſioris (aquæ ſi placet, aut vitri) objectum continentis,_ veluti Super-
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ficies a recta MN repræſentata. </
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<
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">ab oculi centro O prodeant utcun-
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que duo radii OM, ON; </
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hos jam deſignetur objectum FAG (ab axe OA biſectum) hujus è
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medio FGMN ſpectati ſpecies (vel apparentia) alicubi conſiſtet
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inter rectas OM, ON, veluti puta ad φαγ. </
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<
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juſce ſuperficiei natura, communíque refractionum lege palàm eſt)
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ſit angulus φ O γ major angulo FOG; </
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ficat inflectio. </
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<
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eaſdem reſpectivè partes jaceant, ab eadem objecti poſito non immu-
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tatur. </
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<
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ſtrictiùs exquiratur, de totiu
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imaginis φαγ figurâ diſtantiâque
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ſatìs accuratum feretur judicium.</
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<
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">Proponatur corpus denſum_ PMNQ, _Superficiebus_
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_planis parallelis_ (MN, PQ) _comprehenſum;_ </
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<
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">ab oculi centro O
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prodeuntes radii OM, ON ad ſuperficiem MN refringantur in MP,
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NQ; </
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propter incidentias (ad M, P, & </
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">N, Q) pares, ipſis OM, ON
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æquidiſtabunt) inter PF, QG ſtatuatur objectum FAG, cujus ſit
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imago φ α γ; </
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in Exemplo præcedenti.</
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