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

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6547
Lect. VI.
II. Præſternemus autem _λημμdηον_ unum vel alterum; hoc impri-
mìs
:
Incidenti@m circulo radiorum obliquior eſt, qui magis à centro
11Fig. 62. diſtat;
vel qui minorem arcum (ſubſemicircularem) ſubtendit. ſci-
licet
obliquiùs incidit recta QRS, quàm recta MNP.
Nam à
centro
C ducantur CN, CP;
& CR; CS. & quoniam angulus
RCS
angulo NCP (hypotheſi nimirum inſiſtendo) minor eſt;
pater reliquos CRS, CSR reliquos CN, P, CPN (cùm junctim,
tum
ſingulum ſingulo) majores eſſe.
Cùm itaque Semidiametxi
CR
, CN, circumferentiæ perpendiculares ſint;
omninò liquet pro-
poſitum
.
22Fig. 63.

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