Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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[Figure 31]
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[Figure 39]
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<
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<
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ties lentis, & </
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emplo) anterior EBF, cujus centrum ſit C; </
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<
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erigantur BP, DQ, CI ad axin perpendiculares. </
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<
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ctum A ducatur recta quævis API ſecans BP, & </
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<
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<
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CI. </
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<
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">agatur RP ſecans DQ in Q. </
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I. </
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<
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">agatur SY ſecans RP productam in ρ; </
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<
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xml:space
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">à quo demittatur
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perpendicularis ρ K; </
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<
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xml:space
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">centro K intervallo DK deſeribatur circulus
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EDF; </
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<
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<
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<
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XV.</
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<
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">BEne longo circa lucis reflectiones, quatenus hæ viſum afficiunt,
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inſtituto ſtadio metam nunc opportunè ſixuri videmur, ea quomo-
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docunque proſecuti, quæ πρ{ou}ρμαί{te}ρα nobis viſa, nec adeò pervulgata
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ſe objecerant. </
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<
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">quod autem magnitudines objectas attinet (quas utique
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de punctis tantùm radiantibus agentes omnino videamur omiſiſie)
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quales nimirum illæ ex hujuſmodi radiorum inflectionibus quoad ſi-
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tum, figuram, quantitatem mutationes ſubeunt, id fermè totum paſſim
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atque fuſiùs tractatum proſtat, nec animus eſt mihi toties actum agere,
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vel è trivio petita quæque huc transferre. </
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<
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<
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que cuncta de jam definitis ac oftenſis haud difficili negotio colligi
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poſſe videntur; </
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<
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xml:space
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">ſingulorum nempe cujuſvis objecti punctorum (ex-
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tremorum præſertim ac mediorum) apparentias indè determinando.
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</
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<
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xml:space
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">verùm nec ea penitus neglectui habita, ad ſubſequentem quoque
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regulam (ſeu monitiunculam) preſſiùs animum advertentes forſan
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autumabitis. </
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<
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">Si qualem aſſignata quævis ſuperficies inflectens (ſim-
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plex aut compoſita) magnltudinis cujuſvis expoſitæ ſpeciem exhibet
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(ampliorem nempe vel contractiorem, directam aut inverſam, confuſam
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diſtinctámve, ſeu quovis alio modo demutatam) internoſcere </
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