Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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<
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XVI.</
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xml:space
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">P_Unctorum ex inflectione determinatis apparentibus locis,_ con-
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quieſcere poſſem; </
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<
s
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xml:space
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">ſiquidem exinde magnitudinum apparentiæ
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deducuntur, quotlibet in ipſis exiſtentium punctorum imagines de-
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ſignando. </
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<
s
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xml:space
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">cæterùm nè juſto parciùs in hac parte, vel illiberaliùs egiſſe
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videar, etiam _de rectarum linearum (conſequenter & </
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<
s
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xml:space
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">planarum ſuper-_
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_ficierum, quibus diſtinctè viſui repræſentandis natur a præcipuè conſu-_
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_luiſſe videtur) apparentiis & </
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<
s
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xml:space
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">imaginibus expreſſiora ſpecimina quædam_
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_haud gravabor adnectere._ </
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<
s
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xml:space
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">de quibus etiam circa reliquarum magnitu-
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dinum apparentias propius ac promptius fiat judicium.</
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<
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<
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">Notetur autem imprimìs; </
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<
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">Sicuti (quod ſæpiùs in antedictis
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habetur inſinuatum) cujuſque puncti quodammodò duplex eſt imago;
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</
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<
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">una ſimplex, abſoluta, principalis; </
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<
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">illa ſcilicet, quæ in recta verſatur
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ad ſuperficiem inflectentem perpendiculari, perque radians punctum
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ſimul ac oculi centrum tranſeunte (hoc eſt in communi lucidæ radia-
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tionis, ſuperficiei reflectentis, ipſiúſque viſionis axe) altera verò
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relata, mutabilis, ac minùs præcipua; </
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<
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">quæ talis eſt reſpectu oculi
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extra rectam inflectenti ſuperficiei perpendicularem arbitrariè conſti-
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tuti; </
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<
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xml:space
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">ità pari fermè modo duplex cujuſque magnitudinis imago con-
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cipi poteſt; </
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<
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xml:space
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">una quidem abſoluta (quam ſaltem hoc nomine deſig-
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nabo) quæ ex punctorum ſingulorum in ipſa exiſtentium abſolutis
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imaginibus quaſi conflatur, illas ſaltem comprehendit (qualis in ob-
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jecta congrua ſuperficie vividè deformaretur; </
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<
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xml:space
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">qualíſque videretur
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oculo ad infinitam ab inflectente ſuperficie diſtantiam ritè collocato)
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altera verò relata, quæ oculum reſpicit ubivis in certa poſitione con-
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ſtitutum; </
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<
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">quid velim, & </
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">quare ſic diſtinguam ab exemplis benè mul-
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tis in decurſu proponendis luculenter apparebit.</
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