Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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hoc eſt σ π. </
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<
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<
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<
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<
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xml:space
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">eſt autem arc σ π. </
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:</
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<
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xml:space
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<
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<
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xml:space
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">: π ZZ R:</
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<
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xml:space
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<
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<
s
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xml:space
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xml:space
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<
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PA + 2 NA. </
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<
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<
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">& </
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<
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xml:space
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">componendo π N. </
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<
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& </
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<
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<
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nique dividendo FZ. </
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<
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xml:space
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<
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xml:space
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{PA + NA/2}. </
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<
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<
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">Hinc colligitur punctum Z eſſe locum ipſiſſimum, circa quem
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puncti Z imago conſiſtit; </
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<
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">oculi reſpectu in reflexo GN π conſ@ituti,
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tanquam ad O. </
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<
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">etenim ſuperiùs nec ſemel argumentis, ut mihi vide-
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note
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tur, admodum luculentis adfirmatum eſt (ut jam ad inſtar regulæ
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legíſve ratum, fixúmque cenſeri queat iſthic imaginem verſari, ubi
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propiorum incidenti principali (hoc eſt ei cujus reflexus oculi centrum
<
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tranſiens axis Optici vicem ſubit) radiorum reflexi principalem illum
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reflexum interſecant; </
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<
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">Et hoc argumentatione collegi, non illâ quidem incertâ
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vel ambiguâ, ſed nec ad _Geometrici_ rigoris amuſſim præ illa quam in
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præcedentibus uſurpavi (quanquam & </
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Huxerit) adeò exactâ; </
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ſionis adſertæ cauſam apprimè detegit. </
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<
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">Enim verò ſi pleraque cuncta,
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quæ ſe oggerunt huc attinentia, minutatim ac moroſè perſequi vellem,
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immane quantum tædii (commodo veſtro fortaſſè non tanto) mihi-
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met accerſerem, & </
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rem. </
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ciat, viâ quàm breviſſimâ (modò tamen certiſſimâ) metam attingere.
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</
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to breviùs exponenda.</
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