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

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26370
Lect. IX.
Sint Numeri N, M proportionalium PF, PE (quales 22(_a_) 12. Lect.
VII
.
imus ſupra) exponentes;
fiátque N. M : : DS. DT; connectatúr-
que
TB;
hæc lineam FBF continget.
Nam utcúnque ducta ſit recta PG, dictas lineas ſecans, utì cernis:
Eſtque FG. EG : : N. M : : DS. DT : : LG. KG; 33(_b_@@ Lect.
VII
.
cùm ergò ſit KG &
lt; EG; erit LG & lt; FG; unde liquet 44(_c_) _Conſtr_. TB extra curvam FBF totam conſiſtere.
55(_d_) 3. Lect. 7.66(_e_) _Hyp_.
_Exemplum_. Sit PF inter PG, PE è fex mediis tertia; erit er-
go
M = 7;
& N = 3; adeóque DS. DT : : 3. 7.

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