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

Table of contents

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[61.] _Probl_. IV.
[62.] _Probl_. V.
[63.] _Probl_. VI.
[64.] _Probl_. VII
[65.] _Probl_. VIII.
[66.] _Probl_. IX.
[67.] _Probl_. X.
[68.] _Corol. Theor_. I.
[69.] _Theor_. II.
[70.] _Theor_. III.
[71.] _Theor_. IV.
[72.] _Theor_. V.
[73.] _Theor_. VI.
[74.] _Theor_. VII.
[75.] Lect. XIII.
[76.] Æquationum Series prima.
[77.] _Notetur autem_,
[78.] Series ſecunda.
[79.] Not.
[80.] Series tertia.
[81.] Not.
[82.] Not.
[83.] Series quarta.
[84.] Not.
[85.] Series quinta.
[86.] Series ſexta.
[87.] Not.
[88.] Series ſeptima.
[89.] Not.
[90.] Series octava.
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page |< < (47) of 393 > >|
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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