Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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344
151
_Theor_
.
IV
.
Quod
ſi
ponatur
_m_
x
TL
=
_n_
x
arc
BL
,
erit
GL
{
_n_
/}
x
BL
{
_m_
/}
maximum
,
ſeu
majus
quàm
γ
λ
{
_n_
/}
x
B
λ
{
_m_
/}.
_Theor_
.
V
.
Si
fuerit
TG
x
GL
=
DG
LB
,
erit
DG
LB
x
GL
maxi-
mum
,
ſeu
majus
quàm
D
γ
λ
B
x
γ
λ
.
_Theor_
.
VI
.
Sin
TG
x
GL
=
2
DG
LB
,
erit
GL
x
√
DG
LB
maxi-
mum
,
ſeu
majus
quàm
γ
λ
x
√
D
γ
λ
B
.
Haud
difficili
negotio
,
cum
hæc
demonſtrantur
,
tum
ejuſmodi
complura
deprehenduntur
.
Ad
illa
verò
ſuccinctius
comprobanda
deſervire
poſſunt
bujuſmodi
Tbeoremata
.
Sint
duæ
curvæ
AG
B
,
DH
C
quarum
communis
axis
AD
,
1
1
Fig
.
225
.
ſed
ordinatæ
inverſo
ſitu
increſcant
ab
A
ad
DB
,
decreſcant
à
D
ad
AC
;
ad
ordinatæ
verò
communis
GE
H
terminos
,
recta
GS
cur-
vam
AG
B
, &
recta
HT
curvam
DH
C
contingant
.
I
.
Si
recta
HT
rectæ
GS
parallela
ſit
,
erit
GE
H
maxima
or-
dinatarum
in
continuum
jacentium
ſumma
.
Nam
utcunque
ducta
OK
FL
P
ad
GE
H
parallela
(
quæ
Li-
neas
ſecet
ut
cernis
)
erit
GH
=
QP
&
gt
;
KL
.
Not
.
Verum
hoc
,
ſi
curvarum
partes
concavæ
axi
obverſæ
jaceant
,
aliàs
GE
H
erit
minima
.
II
.
Si
ES
=
ET
,
erit
rectangulum
ex
EG
,
EH
maximum
:
Nam
ob
SE
.
SF
:
:
EG
.
FO
, &
TE
.
TF
:
:
EH
.
FP
;
erit
SE
x
TE
.
SF
x
TF
:
:
EG
x
EH
.
FO
x
FP
,
itaque
cum
ſit
SE
x
TE
&
gt
;
SF
x
TF
,
erit
EG
x
EH
&
gt
;
FO
x
FP
.
FINIS
.
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