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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<
s
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xml:space
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">Quinimò methodum hanc leviculam adhibendo pleraſque ſuperfi-
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cierum quarumvis inſlectentium hujus generis affectiones (illas nempe
<
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quæ magnitudinum apparentes quantitates, poſitiones, diſtantias,
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figuras reſpiciunt) compluriúmque _Phænomenωv_ cauſas ipſe ſtatim o-
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perâ levi deprehendes; </
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>
<
s
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xml:space
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">quibus in expreſſiùs deducendis libri plures ad
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tantam molem extumeſcere vel poſſunt, vel ſolent; </
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>
<
s
xml:id
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xml:space
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">ut mihi ſaltem
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opus non ſit hujuſmodi plura congerere. </
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>
<
s
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xml:space
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">veruntamen nè pars hæc
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nimium deficiat, & </
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<
s
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xml:space
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">quoniam nonnulla ſuccurrunt animadverſione non
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indigna, de magnitudinum etiam apparentiis, tam _Dioptricis_ quàm
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_Catoptricis,_ ſpecialia quædam proponam; </
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<
s
xml:id
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xml:space
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">ea verò commodius ſe-
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quentem præſtolabuntur Lectionem.</
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<
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<
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<
s
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xml:space
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">Huic interim, nè abnormiter curta ſit, aliquatenus explendæ _Pro-_
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_blemation_ hoc adnectam:</
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<
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<
s
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xml:space
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">Exponatur oculo, cujus centrum O, longinquum objectum FG,
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ab oculi, circulique refringentis axe ABO biſectum; </
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<
s
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xml:space
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">datúſque ſit
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angulus ſimpliciter (oculo nempe nudo) apparens FOG. </
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<
s
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xml:space
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">item aſſig-
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netur punctum Z, quod imago ſit puncti A à circulo refringeute facta;
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</
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<
s
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xml:space
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">datus ſit denuò ex refractione apparens angulus POQ; </
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<
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xml:space
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<
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note
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circulum iſtum refringentem deſcribere (vel determinare).</
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<
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<
s
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xml:space
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">_Analyſis._ </
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<
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<
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cujus ſit centrum C, vertex B; </
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<
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xml:space
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">& </
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<
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<
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xml:space
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tur CY ad OF parallela, rectæque OP occurrens in Y, & </
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<
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nectatur CN. </
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<
s
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xml:space
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">cum itaque ſit NY refractus radii ad FO, vel CY
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paralleli; </
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<
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xml:space
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<
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<
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<
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<
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cùm prætereà angulus Y (dato FOP æqualis) detur, etiam (in tri-
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angulo CYN) angulus CNY innoteſcet. </
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<
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xml:space
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ſpecie datur; </
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<
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<
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CB. </
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<
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<
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<
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CO ad CZ quoque datur; </
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<
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<
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OZ datur; </
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<
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<
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<
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<
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<
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O ρ, & </
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<
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ZRS ad ζ σ parallela. </
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<
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<
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ponendo OT. </
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<
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<
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√ OZq - Vq; </
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<
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<
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</
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<
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<
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<
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<
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<
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OZq :</
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<
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<
s
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<
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<
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OC). </
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<
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denique centro C per N ducatur circulus BN; </
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<
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facit.</
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