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

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302109 = Z; erit curva AGF _Circulus_; & curva AB =
{AD 2}+{DL/2 AK}arc.
KL.
3. Sit linea KL _Hyperbola æquilatera_, cujus _Centrum_ A, &
11Fig. 164. _Axis_ AK = Z;
erit CGE recta linea; & curva AB
_Parabola._
4. Sit Linea KL _Parabola_ (cujus axis AD) erit curva CG E
22Fig. 163. quoque _Parabola_;
& curva AB _Paraboliformium_ quæ-
dam.
5. Sit curva KL _Paraboliformis_ quædam inverſa, vel infini-
33Fig. 165. ta (talis ſcilicet ut ſit FH = √{Z3/AF}) erit curva AB _Cyclo-_
_is_, ad _circulum_ pertinens, cujus _Diameter_ ipſi Z æqua-
tur.
Elegantiora forſan _Exempla_ ipſe circumſpectans excogitabis.

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