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

Table of Notes

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9173
1. Si fuerit I & gt; R; fiat I-R. R: : BC. CZ; quare compo-
11Fig. 105. nendo erit I.
R: : BZ. CZ. ergò factum.
2. Sin I & lt; R; fiat R - I. I : : BC. BZ. ergò rurſus compo-
nendo
R.
I: : CZ. BZ. vel inversè, I. R : : BZ. CZ.
XXV. Fiat jam CA. AB: : CZ. BZ; Dico punctum Z eſſe
metam
, citra quam (reſpectu centri C) nullus reflexus axem de-
cuſſabit
;
hoc eſt præmiſſis inſiſtendo, fore CK & gt; CZ.
Nam ducatur NT circulum contingens ad N. erit ergo NK. NA
:
: KT. AT & lt; BK. AB. quare NK. NA + AB. BZ & lt; BK.
AB + AB. BZ = BK. BZ. eſt verò NK. NA : : CK. CA.
&
AB. BZ: : CA. CZ. ergò CK. CA + CA. CZ & lt; BK.
BZ
.
hoc eſt CK. CZ& lt; BK. BZ. vel permutando CK. BK & lt;
CZ
.
BZ. unde dividendo CB. BK & lt; CB. BZ. adeóque BK& gt;
BZ
.
unde liquet propoſitum.

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