DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.1274#0072
76
SECTION II.
APPLICATION
OF THE
Four Planes, Three Lines, and the Point of Sight.
APPEARANCES in nature depend on the place of
the observer, the point from whence he sees, or (to
express it more properly) the place of his eye, in the
Real Perspective Plane.
As Positions change by the least alteration in this
point, it is necessary, in all kind of drawings, to have
this accurately determined, that every Natural Situation,
on the Artificial Perspective Plane, may correspond by
rule to its place in the Real Perspective Plane.
The observer marks his choice of place on the Ground
Line, in the Artificial Perspective Plane, after having
correctly determined, in the Real, what distance he
stands from either side : or rather, in what proportionate
part it is. Here he gives Perpendicular to the Ground
Line, a Line which is the Vertical Plane, or Perpendi-
SECTION II.
APPLICATION
OF THE
Four Planes, Three Lines, and the Point of Sight.
APPEARANCES in nature depend on the place of
the observer, the point from whence he sees, or (to
express it more properly) the place of his eye, in the
Real Perspective Plane.
As Positions change by the least alteration in this
point, it is necessary, in all kind of drawings, to have
this accurately determined, that every Natural Situation,
on the Artificial Perspective Plane, may correspond by
rule to its place in the Real Perspective Plane.
The observer marks his choice of place on the Ground
Line, in the Artificial Perspective Plane, after having
correctly determined, in the Real, what distance he
stands from either side : or rather, in what proportionate
part it is. Here he gives Perpendicular to the Ground
Line, a Line which is the Vertical Plane, or Perpendi-