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The horizontal and profile traces of this plane are parallel to the axis y.
Plane is perpendicular a profile plane of projection and an inclination to horizontal and face-
to-face planes (Fig. 4.7). It is called profile-projecting plane.
Figure 4.7
The frontal and horizontal traces of this plane are parallel to the axis x.
Level planes also can be in three positions:
Plane is parallel to a horizontal plane of projections and it is perpendicular face-to-face and
profile (Fig. 4.8). It is called horizontal plane;
Figure 4.8
If a plane is parallel to horizontal plane of projections Π 1, there is no its horizontal trace h 0,
while frontal trace f 0 is parallel to the axis x, and conversely.
Plane is parallel to a face-to-face plane and it is perpendicular horizontal and profile (Fig.
4.9). It is called frontal plane.
Figure 4.9
If a plane is parallel to frontal plane of projections Π 2, there is no its frontal trace f 0, while
horizontal trace h 0 is parallel to the axis x, and conversely.
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