Barrow, Isaac, Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur

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9779 Rρ : : CF. Fβ quapropter erit ex æquo Xξ. Rρ : : Fγ. Fβ.
non diſpare ratione conſtabit eſſe Rρ. Nv: : Fβ. Fα. ergò cùm
tres Xξ, Rρ, NV ſe æqualiter excedant;
etiam tres Fγ, Fβ, Fα 11_21 hujus Lect._
_Hyp._
æqualiter excedent;
unde conſequetur eſſe Cα-Cβ& lt; Cβ-Cγ;
nec non eſſe α G-β H& lt; βH-γI; adeóque conjunctim 22_22 buius Lect_ - CH & lt; CH - CI; hoc eſt CK-CL & lt; CL - CO; hoc
eſt denuò LK &
lt; OL: Q. E. D.
XV. Hinc apparet rectiùs illapſam refringenti lucem magìs inſpiſſa-
ri;
versúſque punctum Z in arctius redigi; maximam proinde vim
ejus iſthic exeri;
focúmque combuſtionis (ad ſolem) ibi verſari.
XVI. Conſectatur etiam radios (hujuſmodi ſaltem parallelos) quò
rectiores oculo (cujus nempe ſuperficies refractionis munus obeuntes
aut Sphæricæ ſunt, aut Sphæricas aliquatenus referunt) incidunt, eò
facilius ab ipſo readunari, ſeu propiùs recolligi.
XVII. Quinimò tandem ex his colligitur viſibilis longinqui puncti
ſpeciem oculo, in axe poſito, circa punctum Z apparere.
Etenim ab
ei adjacentibus partibus refracti cùm præ cæteris perpendiculares (vi
proinde fortiores, &
recollectu paratiores) neque non copioſiores
affluunt;
quibus ex cauſis imaginis poſitio dependet; ut jam ſæpiùs
admonitum:
- ἐχ{θρ}όν δέ {μο}ι {ἐστι}ὶν Αὖπς ἀeιζήλως {ηῤ}ρημένα μυ{θσ}λο {γρ}ύ{ει}ν
cæterùm hâc defunctus curâ tantiſper reſpirabo.

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