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

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_Notetur autem_,
3. _Curva_ ALL eſt _hyperbola æquilatera_, cujus _axis_ AB, reliquæ
AMM
, ANN ſunt _hiperboliformes_.
4. Si AO ſit {1/2} AB; & AP = {1/3} AB, & AQ = {1/4} AB, du-
cantúrque
OT, PV, QX ad BS parallelæ, erunt curvarum ALL,
AMM
, ANN _aſymptoti_.
5. Hinc conſtat in ſecundo gradu fore _a_ & gt; _n_ - {_b_/2}; in tertio _a_& gt;
_n_ - {_b_/3}; in quarto _a_& gt; _n_ - {_b_/4}; quæ tamen inæqualitates, ſi AE
benemagna
ſit, exiguæ erunt.
6. Æquationibus iſtis nulla competit _maxima, vel minima_.
_a_ - _b_ = _n_.
_aa_ - _ba_ = _nn_.
_a_3 - _baa_ = _n_3.
_a_4 - _ba_3 = _n_4, & c.
Sit rurſus AB = _b_; & indefinitè protrahatur AB verſus I, &
22Fig. 207. ſint anguli RAI, SBI ſemirecti;
tum concipiantur curvæ BLL,
BMM
, BNN tales, ut ſi utcunque ducatur GZ ad AI perpendicu-
laris
(dictas lineas ſecans, utì cernis, punctis K, L, M, N, Z) ſit

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