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

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26572 interſecans, ut expreſſum vides; eſtque jam PK. PL : : M. 11_a Converſ_. 4.
Lect
. VI.
:
: GE. GF & gt; PE. PF & gt; PK. PF; quare PL & lt; PF; igitur _Hyperbola_ LBL curvam FB F tangit. Protracta jam TB
22_b_ 11. Lect. VII. cum XZ conveniat in R;
eſtque tum RZ. ZB : : BS. ST. unde
33_c_ @@. Lect. VII. RZ xST = BS x ZB = BS x S X.
atqui propter DS. SX : : BS. SY, eſt DS xSY = BS xSX. ergò RZ xST = DS xS Y
44_d Conſtr_. = DS x CX.
vel RZ. CX : : DS . ST; compoſitéque RZ . RZ
+ CX :
: DS. DT : : N. M : : CZ. CZ + CX. itaque diviſim eſt RZ. CX : : CZ. CX. adeóque RZ = CZ; unde RB
_hyperbolam_
LBL tangit;
hæc igitur ( RBT) curvam FBF, ipſi
LBL
contiguam, quoque tanget.
quod erat Propoſitum.
77_b_ 7. Lect. VIII.

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