Gravesande, Willem Jacob 's
,
An essay on perspective
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115
55
on PERSPECTIVE.
making
theſe
Abbreviations
,
will
be
laid
down
in
the
following
Methods
.
Method
II
.
70
.
By
the
accidental
Point
of
inclin’d
Lines
.
Thro’
F
,
the
accidental
Point
of
the
inclin’d
1
1
Fig
.
36
.
parallel
Lines
,
draw
F
H
,
parallel
to
the
Baſe
Line
,
and
equal
to
F
G
.
And
let
A
be
the
Point
,
wherein
one
of
the
inclin’d
Lines
meets
the
Geometrical
Plane
.
Operation
.
Aſſume
R
Q
in
the
Baſe
Line
,
equal
to
the
inclin’d
Line
;
and
draw
Lines
from
the
Points
R
and
Q
,
to
the
Point
Z
,
taken
at
pleaſure
in
the
Horizontal
Plane
.
Thro’
a
,
the
Perſpective
of
A
,
draw
a
N
pa-
rallel
to
the
Baſe
Line
;
in
which
aſſume
a
L
,
equal
to
M
N
;
and
draw
a
Line
from
the
Point
a
,
to
the
Point
F
;
and
from
the
Point
L
,
draw
another
to
the
Point
H
.
Then
a
T
will
be
the
Perſpective
ſought
.
Demonstration
.
By
the
Nature
of
the
accidental
Point
,
2
2
14
.
Perſpective
ſought
is
a
Part
of
the
Line
a
F
;
and
therefore
,
we
are
only
to
demonſtrate
,
that
the
Extremity
of
the
faid
Perpendicular
is
in
the
Line
L
H
.
Which
may
be
thus
done
.
Let
us
ſuppoſe
a
Line
,
A
I
,
to
paſs
thro’
the
Point
A
,
parallel
to
the
Baſe
Line
,
and
equal
to
the
inclin’d
Line
.
It
is
then
manifeſt
,
3
3
56
.
L
is
the
Perſpective
of
I
;
and
conſequently
,
L
H
is
the
Appearance
of
a
Line
4
4
@@
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