DOI Page / Citation link:
https://doi.org/10.11588/diglit.1274#0069
73
through all their respective parts, viz. the view as far
as it is chosen, and the drawing that represents this
portion; which are the Real and Artificial Per-
spective Planes.
HORIZONTAL PLANE.
It is parallel with the surface of water, at right angles to
the Perspective Plane. Its situation is always the height
of the observer's eye from the ground, which gives it its
place; and being always opposite to the observer's eye,
it is in breadth but one line.
VERTICAL
OR
PERPENDICULAR PLANE.
It is perpendicular to the surface of water, and to the
Horizontal Plane, and at right angles to the Perspective
Plane.
Its situation is the place of the observer, which it is
given to describe: Its breadth, being opposite to the
eye, is of course but one line.
The point of its intersection with the Horizontal
Plane is the precise place of the observer's eye, and
is called the point of sight, or the visual ray.
through all their respective parts, viz. the view as far
as it is chosen, and the drawing that represents this
portion; which are the Real and Artificial Per-
spective Planes.
HORIZONTAL PLANE.
It is parallel with the surface of water, at right angles to
the Perspective Plane. Its situation is always the height
of the observer's eye from the ground, which gives it its
place; and being always opposite to the observer's eye,
it is in breadth but one line.
VERTICAL
OR
PERPENDICULAR PLANE.
It is perpendicular to the surface of water, and to the
Horizontal Plane, and at right angles to the Perspective
Plane.
Its situation is the place of the observer, which it is
given to describe: Its breadth, being opposite to the
eye, is of course but one line.
The point of its intersection with the Horizontal
Plane is the precise place of the observer's eye, and
is called the point of sight, or the visual ray.